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Jeon SH, You G, Park J, Chung Y, Park K, Kim H, Jeon J, Kim Y, Son WC, Jeong DS, Shin EC, Lee JY, Han DH, Jung J, Park SH. Anti-4-1BB×PD-L1 Bispecific Antibody Reinvigorates Tumor-Specific Exhausted CD8+ T Cells and Enhances the Efficacy of Anti-PD-1 Blockade. Clin Cancer Res 2024:745359. [PMID: 38743752 DOI: 10.1158/1078-0432.ccr-23-2864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/21/2023] [Revised: 04/02/2024] [Accepted: 05/09/2024] [Indexed: 05/16/2024]
Abstract
PURPOSE To overcome the limited efficacy of immune checkpoint blockade, there is a need to find novel cancer immunotherapeutic strategies for the optimal treatment of cancer. The novel anti-4-1BB×PD-L1 bispecific antibody-ABL503 (also known as TJ-L14B)-was designed to simultaneously target PD-L1 and 4-1BB, and demonstrated strong antitumor T-cell responses without considerable toxicity. Here, we investigated how the combination of ABL503 and anti-PD-1 blockade affected the reinvigoration of exhausted tumor-infiltrating CD8+ T cells (CD8+ TILs) and anti-tumor efficacy. EXPERIMENTAL DESIGN Single cell suspensions of hepatocellular carcinoma and ovarian cancer from treatment-naive patients were used for immunophenotyping of CD8+ TILs and in vitro functional assays. Humanized hPD-1/hPD-L1/h4-1BB triple knock-in mice were used to evaluate the effects of ABL503 and anti-PD-1 blockade in vivo. RESULTS We observed that ABL503 successfully restored the functions of 4-1BB+ exhausted CD8+ TILs, which were enriched for tumor-specific T cells but unresponsive to anti-PD-1 blockade. Importantly, compared to anti-PD-1 blockade alone, the combination of ABL503 and anti-PD-1 blockade further enhanced the functional restoration of human CD8+ TILs in vitro. Consistently, the combination of ABL503 with anti-PD-1 in vivo significantly alleviated tumor growth, and induced enhanced infiltration and activation of CD8+ TILs. CONCLUSIONS ABL503-a PD-L1 and 4-1BB dual-targeting bispecific antibody-elicits pronounced additive tumor growth inhibition, with increased infiltration and functionality of exhausted CD8+ T cells, which in turn enhances the anti-cancer effects of anti-PD-1 blockade. These promising findings suggest that ABL503 (TJ-L14B) in combination with PD-1 inhibitors will likely further enhance therapeutic benefit in clinical trials.
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Affiliation(s)
- Seung Hyuck Jeon
- Seoul National University Bundang Hospital, Seongnam, Korea (South), Republic of
| | - Gihoon You
- ABL Bio Inc., Seongnam, Korea (South), Republic of
| | - Junsik Park
- Soonchunhyang University Bucheon Hospital, Bucheon, Korea (South), Republic of
| | - Youseung Chung
- Korea Advanced Institute of Science and Technology, Korea (South), Republic of
| | | | | | | | | | - Woo-Chan Son
- Asan Institute for Life Sciences, Asan Medical Center, College of Medicine, University of Ulsan, Seoul, Korea (South), Republic of
| | - Da Som Jeong
- Asan Medical Center, Seoul, Korea (South), Republic of
| | - Eui-Cheol Shin
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Jung-Yun Lee
- Yonsei University College of Medicine, Seoul, Korea (South), Republic of
| | - Dai Hoon Han
- Yonsei University college of medicine, Seoul, Korea (South), Republic of
| | - Jaeho Jung
- ABL Bio, Seongnam, Korea (South), Republic of
| | - Su-Hyung Park
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
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Jeon SH, Jang BS, Kim DY, Kim JH, Shin EC, Kim IA. Dynamic Responses of Circulating T Cells After Stereotactic Body Radiation Therapy for Bone Metastasis in Patients With Breast Cancer. Int J Radiat Oncol Biol Phys 2024; 118:790-800. [PMID: 37802227 DOI: 10.1016/j.ijrobp.2023.09.020] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Revised: 09/07/2023] [Accepted: 09/16/2023] [Indexed: 10/08/2023]
Abstract
PURPOSE Preclinical studies have shown that radiation therapy modulates antitumor immune responses. However, circulating T-cell responses after radiation therapy in patients with cancer have been poorly characterized. This study aims to explore the changes in circulating T cells after stereotactic body radiation therapy (SBRT). METHODS AND MATERIALS Peripheral blood samples of 30 patients with breast cancer who underwent SBRT for bone metastasis were analyzed using multicolor flow cytometry. Phenotypes of PD-1+ CD8+ T cells and regulatory T (TREG) cells were examined. Additionally, plasma protein levels were analyzed using a bead-based immunoassay. RESULTS Circulating PD-1+ CD8+ T cells, which are enriched for tumor-specific clonotypes, were activated at 1 week after SBRT. However, circulating TREG cells were also activated after SBRT; this pattern was also evident among effector Foxp3hiCD45RA- TREG cells. We observed no difference in T-cell responses according to the fraction size and number. Notably, activation of TREG cells was more prominent in patients who experienced greater activation of PD-1+ CD8+ T cells. Plasma level changes in TGF-β1, soluble CTLA-4, and soluble 4-1BB at 1 week after SBRT were associated with PD-1+ CD8+ T-cell responses. Activation of TREG cells at 1 week after SBRT was associated with worse progression-free survival. Clinical factors including molecular subtype were not associated with the T-cell responses. CONCLUSIONS SBRT induced activation of both potentially tumor-specific CD8+ T cells and TREG cells, which were tightly associated with each other. These results may support the use of TREG cell-modulating strategies with SBRT to improve the antitumor immune response.
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Affiliation(s)
- Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea; Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - Bum-Sup Jang
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Dong-Yun Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jin Ho Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea; Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea; The Center for Viral Immunology, Korea Virus Research Institute, Institute for Basic Science (IBS), Daejeon, Republic of Korea.
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Republic of Korea; Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea; Medical Science Research Institute, Seoul National University Bundang Hospital, Seongnam, Republic of Korea; Department of Tumor Biology and Cancer Research Institute, Seoul National University, Seoul, Republic of Korea; Integrated Major in Innovative Medical Science, Seoul National University Graduate School, Seoul, Republic of Korea.
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Song JY, Han MG, Kim Y, Kim MJ, Kang MH, Jeon SH, Kim IA. Combination of local radiotherapy and anti-glucocorticoid-induced tumor necrosis factor receptor (GITR) therapy augments PD-L1 blockade-mediated anti-tumor effects in murine breast cancer model. Radiother Oncol 2024; 190:109981. [PMID: 37925106 DOI: 10.1016/j.radonc.2023.109981] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2023] [Revised: 10/27/2023] [Accepted: 10/29/2023] [Indexed: 11/06/2023]
Abstract
PURPOSE In this study, we investigated whether local radiotherapy (RT) and an anti-glucocorticoid-induced tumor necrosis factor receptor (GITR) agonist could increase the efficacy of PD-L1 blockade. METHODS AND MATERIALS We analyzed a breast cancer dataset from the Molecular Taxonomy of Breast Cancer International Consortium (METABRIC) to determine the role of GITR in breast cancer. We used the 4T1 murine TNBC model (primary and secondary tumors) to investigate the efficacy of PD-L1 blockade, local RT, anti-GITR agonist, and their combinations. We assessed tumor growth by tumor volume measurements, in vivo bioluminescence imaging, and metastatic lung nodule counts to evaluate the effects of these treatments. Flow cytometry and immunohistochemistry determined the proportions and phenotypes of CD8+ T-cells and regulatory T-cells (Tregs) in the tumors and spleen. Plasma cytokine levels were measured by enzyme-linked immunosorbent assay. RESULTS In the METABRIC cohort, patients with high expression of TNFRSF18, which encodes GITR, had significantly better survival than those with low expression. Adding local RT or anti-GITR agonist to PD-L1 blockade did not significantly augment efficacy compared to PD-L1 blockade alone; however, adding both to PD-L1 blockade significantly reduced tumor growth and lung metastasis. The benefits of the triple combination were accompanied by increased CD8+ T-cells and decreased Tregs in the tumor microenvironment and spleen. CONCLUSIONS The combination of local RT and an anti-GITR agonist significantly enhanced the anti-tumor immune responses induced by PD-L1 blockade. These results provide the preclinical rationale for the combination of therapy.
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Affiliation(s)
- Jun Yeong Song
- Department of Radiation Oncology, Seoul National University School of Medicine, Republic of Korea.
| | - Min Guk Han
- Medical Science Research Institute, Seoul National University Bundang Hospital, Republic of Korea
| | - Yoomin Kim
- Department of Tumor Biology, Graduate School of Medicine & Cancer Research Institute, Seoul National University, Republic of Korea; Medical Science Research Institute, Seoul National University Bundang Hospital, Republic of Korea
| | - Min Ji Kim
- Department of Tumor Biology, Graduate School of Medicine & Cancer Research Institute, Seoul National University, Republic of Korea
| | - Mi Hyun Kang
- Medical Science Research Institute, Seoul National University Bundang Hospital, Republic of Korea
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Republic of Korea; Medical Science Research Institute, Seoul National University Bundang Hospital, Republic of Korea
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University School of Medicine, Republic of Korea; Department of Radiation Oncology, Seoul National University Bundang Hospital, Republic of Korea; Department of Tumor Biology, Graduate School of Medicine & Cancer Research Institute, Seoul National University, Republic of Korea; Medical Science Research Institute, Seoul National University Bundang Hospital, Republic of Korea.
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Jeon SH, Song C, Eom KY, Kim IA, Kim JS. Modulation of CD8 + T Cell Responses by Radiotherapy-Current Evidence and Rationale for Combination with Immune Checkpoint Inhibitors. Int J Mol Sci 2023; 24:16691. [PMID: 38069014 PMCID: PMC10706388 DOI: 10.3390/ijms242316691] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2023] [Revised: 11/17/2023] [Accepted: 11/22/2023] [Indexed: 12/18/2023] Open
Abstract
Radiotherapy for cancer has been known to affect the responses of immune cells, especially those of CD8+ T cells that play a pivotal role in anti-tumor immunity. Clinical success of immune checkpoint inhibitors led to an increasing interest in the ability of radiation to modulate CD8+ T cell responses. Recent studies that carefully analyzed CD8+ T cell responses following radiotherapy suggest the beneficial roles of radiotherapy on anti-tumor immunity. In addition, numerous clinical trials to evaluate the efficacy of combining radiotherapy with immune checkpoint inhibitors are currently undergoing. In this review, we summarize the current status of knowledge regarding the changes in CD8+ T cells following radiotherapy from various preclinical and clinical studies. Furthermore, key biological mechanisms that underlie such modulation, including both direct and indirect effects, are described. Lastly, we discuss the current evidence and essential considerations for harnessing radiotherapy as a combination partner for immune checkpoint inhibitors.
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Affiliation(s)
| | | | | | | | - Jae-Sung Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam 13620, Republic of Korea; (S.H.J.); (C.S.); (K.-Y.E.); (I.A.K.)
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Kim IA, Jeon SH. Characterization of Peripheral T-Cell Dynamics in the Patients with Bone Metastasis from Breast Cancer Following Stereotactic Body Radiotherapy. Int J Radiat Oncol Biol Phys 2023; 117:S158-S159. [PMID: 37784397 DOI: 10.1016/j.ijrobp.2023.06.585] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
PURPOSE/OBJECTIVE(S) Preclinical studies suggest that radiotherapy (RT) elicits various effects on antitumor T-cell responses. However, systemic T-cell responses upon RT in real-world cancer patients, including those with metastatic breast cancer, are poorly characterized. This study aims to investigate the detailed dynamics of peripheral T cells upon stereotactic body radiotherapy (SBRT) in metastatic breast cancer patients. MATERIALS/METHODS Peripheral blood samples of 32 prospectively recruited patients who received SBRT to bone metastasis of breast cancer, which were acquired at pre-SBRT (W0), 1 week after SBRT (W1), and 4 weeks after SBRT (W4), were analyzed using multi-color flow cytometry and cytometric bead array. Most patients (n = 30) received SBRT of 1 fraction (n = 16) or 3 fractions (n = 14). We also performed a subgroup analysis of 22 patients who did not start a new systemic therapy within 1 month before SBRT (new systemic Tx >1mo) to exclude the effects of systemic therapies. RESULTS Peripheral PD-1+ CD8+ T cells, which are enriched for tumor-specific clonotypes, were activated with increased expression of Ki-67 at W1 compared to W0. Expression of Ki-67 on PD-1+ CD8+ T cells remained higher at W4 than W0, although it was not statistically significant. Moreover, expressions of Ki-67 and CTLA-4 on circulating regulatory T (TREG) cells were increased at W1 compared to W0. The suppressive (Foxp3hiCD45RA-) TREG cells also exhibited enhanced expressions of Ki-67 and CTLA-4 at W1. We defined immunologic responders (ImmRs) as patients with Ki-67 expression on PD-1+ CD8+ T cells at W1 greater than 1.5-times of W0, and otherwise immunologic non-responders (ImmNRs). Notably, fold changes in expressions of Ki-67 and CTLA-4 on TREG cells and proportion of suppressive TREG cells among total TREG cells at W1 over W0 were higher in ImmRs than ImmNRs. Similar phenotypical changes of T cells were observed in the subgroup analysis of the patients with new systemic Tx >1mo. The peripheral T-cell changes were not significantly different between the dose-fractionation schedules (1 fraction vs. 3 fractions) nor molecular subtypes of cancer. In patients with new systemic Tx >1mo, plasma level changes of TGF-β1, sCTLA-4, and s4-1BB at W1 compared to W0 were significantly higher in ImmRs compared to ImmNRs, while only change of s4-1BB was associated with the immunologic response. CONCLUSION Our results suggest that circulating PD-1+ CD8+ T cells are activated upon SBRT. However, SBRT also results in the activation of circulating TREG cells, which was more prominent in patients with a significant activation of circulating PD-1+ CD8+ T cells. Alterations in plasma levels of TGF-β1, sCTLA-4, and s4-1BB are associated with the peripheral T-cell responses. Dose-fractionation schedule is not associated with the peripheral T-cell responses.
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Affiliation(s)
- I A Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, Korea, Republic of (South) Korea
| | - S H Jeon
- Seoul National University Bundang Hospital, Seongnam, Korea, Republic of (South) Korea
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Kim S, Jeon SH, Han MG, Kang MH, Kim IA. BRD4 Inhibition Enhances the Antitumor Effects of Radiation Therapy in a Murine Breast Cancer Model. Int J Mol Sci 2023; 24:13062. [PMID: 37685868 PMCID: PMC10487493 DOI: 10.3390/ijms241713062] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2023] [Revised: 08/14/2023] [Accepted: 08/20/2023] [Indexed: 09/10/2023] Open
Abstract
Bromodomain-containing protein 4 (BRD4) is an intracellular protein that regulates expression of various cellular functions. This study investigated whether BRD4 inhibition can alter the immunomodulatory and antitumor effects of radiation therapy (RT). A murine breast cancer cell line was implanted into BALB/c mice. The dual-tumor model was used to evaluate the abscopal effects of RT. A total of 24 Gy was delivered and BRD4 inhibitor was injected intravenously. Tumor size was measured, and in vivo imaging was performed to evaluate tumor growth. Flow cytometry and immunohistochemistry were performed to examine immunologic changes upon treatment. The combination of BRD4 inhibitor and RT significantly suppressed tumor growth compared to RT alone. BRD4 inhibitor reduced the size of the unirradiated tumor, indicating that it may induce systemic immune responses. The expression of HIF-1α and PD-L1 in the tumor was significantly downregulated by the BRD4 inhibitor. The proportion of M1 tumor-associated macrophages (TAMs) increased, and the proportion of M2 TAMs decreased upon BRD4 inhibition. BRD4 inhibitor expanded CD4+ and CD8+ T cell populations in the tumor microenvironment. Additionally, splenic monocytic myeloid derived suppressor cells, which were increased by RT, were reduced upon the addition of BRD4 inhibitor. Therefore, the addition of BRD4 inhibitor significantly enhanced the systemic antitumor responses of local RT.
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Affiliation(s)
- Seongmin Kim
- Department of Tumor Biology, Graduate School of Medicine, Seoul National University, Seoul 03080, Republic of Korea; (S.K.); (M.G.H.)
- Integrated Major in Innovative Medical Science, Seoul National University Graduate School, Seoul 03080, Republic of Korea
- Medical Science Research Institute, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea;
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Bundang Hospital, 173 Gumiro, Seongnam-si 13620, Republic of Korea
| | - Min Guk Han
- Department of Tumor Biology, Graduate School of Medicine, Seoul National University, Seoul 03080, Republic of Korea; (S.K.); (M.G.H.)
- Medical Science Research Institute, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea;
| | - Mi Hyun Kang
- Medical Science Research Institute, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea;
| | - In Ah Kim
- Department of Tumor Biology, Graduate School of Medicine, Seoul National University, Seoul 03080, Republic of Korea; (S.K.); (M.G.H.)
- Integrated Major in Innovative Medical Science, Seoul National University Graduate School, Seoul 03080, Republic of Korea
- Medical Science Research Institute, Seoul National University Bundang Hospital, Seongnam-si 13620, Republic of Korea;
- Department of Radiation Oncology, Seoul National University Bundang Hospital, 173 Gumiro, Seongnam-si 13620, Republic of Korea
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Jeon SH, Kim SW, Seo M, Lim YJ. Abstract P1-05-17: Radiomic models based on dynamic contrast-enhanced magnetic resonance imaging predict the immunophenotype reflecting spatial distribution of CD8+ tumor-infiltrating lymphocytes in breast cancer. Cancer Res 2023. [DOI: 10.1158/1538-7445.sabcs22-p1-05-17] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/06/2023]
Abstract
Abstract
Purpose: This study aimed to develop noninvasive magnetic resonance imaging (MRI)-based radiomic models to predict immunophenotypes of breast cancer. Methods: A total of 182 breast cancer patients who underwent upfront surgery were analyzed, divided into training (n = 137) and validation (n = 45) cohorts. Dynamic contrast-enhanced (DCE)-MRI was acquired, and immunophenotype was determined on the surgical tumor sections: immune-inflamed (high degree of CD8+ T cells infiltrated), -excluded (CD8+ T cells accumulated at invasive margin but not efficiently infiltrated in tumor bed), and -desert (CD8+ T cells absent within tumor and at margins). Based on 833 radiomic features extracted after manual delineation, the least absolute shrinkage and selection operator method was used to build radiomic models. Results: Our radiomic models from the whole tumor sections showed moderate performance in predicting the immune-inflamed versus non-inflamed tumors, showing the highest AUC values, of 0.659 and 0.671 for training and validation cohorts, respectively. Combining the models, much improved predictability was observed, with AUC values of 0.973 and 0.985 for training and validation cohorts, respectively. Other radiomic features from tumor periphery data discriminated immune-excluded versus immune-desert status, with AUC values of 0.993 and 0.984 for training and validation cohorts, respectively. The combined models were also applicable to predicting immunophenotype for different molecular subtypes, with AUC values ≥ 0.867. Conclusions: By integrating the immunohistochemistry profiles, we established MRI-derived radiomic models to predict the detailed immunophenotype of breast cancer. This study suggests the feasibility of noninvasive assessment of tumor immune status in real-world clinics.
Citation Format: Seung Hyuck Jeon, So-Woon Kim, Mirinae Seo, Yu Jin Lim. Radiomic models based on dynamic contrast-enhanced magnetic resonance imaging predict the immunophenotype reflecting spatial distribution of CD8+ tumor-infiltrating lymphocytes in breast cancer [abstract]. In: Proceedings of the 2022 San Antonio Breast Cancer Symposium; 2022 Dec 6-10; San Antonio, TX. Philadelphia (PA): AACR; Cancer Res 2023;83(5 Suppl):Abstract nr P1-05-17.
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Affiliation(s)
- Seung Hyuck Jeon
- 1Korea Advanced Institute of Science and Technology, Republic of Korea
| | - So-Woon Kim
- 2Kyung Hee University Medical Center, Republic of Korea
| | - Mirinae Seo
- 3Kyung Hee University Medical Center, Republic of Korea
| | - Yu Jin Lim
- 4Kyung Hee University, Republic of Korea
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Jeon SH, Lee YJ, Kim HD, Nam H, Ryoo BY, Park SH, Yoo C, Shin EC. Dynamic changes in peripheral blood monocytes early after anti-PD-1 therapy predict clinical outcomes in hepatocellular carcinoma. Cancer Immunol Immunother 2023; 72:371-384. [PMID: 35902399 PMCID: PMC9333050 DOI: 10.1007/s00262-022-03258-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2022] [Accepted: 07/11/2022] [Indexed: 01/26/2023]
Abstract
Immune checkpoint inhibitors are effective for advanced hepatocellular carcinoma (HCC), but there remains a need for peripheral blood biomarkers to predict the clinical response. Here, we analyzed the peripheral blood of 45 patients with advanced HCC who underwent nivolumab. During treatment, frequency of classical monocytes (CD14+CD16-) was increased on day 7, and the fold increase in the frequency on day 7 over day 0 (cMonocyteD7/D0) was significantly higher in patients with durable clinical benefit (DCB) than in patients with non-DCB (NDB). When we analyzed transcriptomes of classical monocytes, CD274, gene encoding PD-L1, was upregulated in NDB patients compared to DCB patients at day 7. Notably, gene signature of suppressive tumor-associated macrophages, or IL4l1+PD-L1+IDO1+ macrophages, was enriched after treatment in NDB patients, but not in DCB patients. Accordingly, the fold increase in the frequency of PD-L1+ classical monocytes at day 7 over day 0 (cMonocyte-PDL1D7/D0) was higher in NDB patients than DCB patients. The combined biomarker cMonocyteD7/D0/cMonocyte-PDL1D7/D0 was termed the "monocyte index", which was significantly higher in DCB patients than NDB patients. Moreover, the monocyte index was an independent prognostic factor for survival. Overall, our results suggest that early changes of circulating classical monocytes, represented as a monocyte index, could predict clinical outcomes of advanced HCC patients undergoing anti-PD-1 therapy.
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Affiliation(s)
- Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Yong Joon Lee
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
- Department of Surgery, Yonsei University College of Medicine, Seoul, 03722, Republic of Korea
| | - Hyung-Don Kim
- Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea
| | - Heejin Nam
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Baek-Yeol Ryoo
- Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea
| | - Su-Hyung Park
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea
| | - Changhoon Yoo
- Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, 05505, Republic of Korea.
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, 34141, Republic of Korea.
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Jeon SH, Kang M, Jeon M, Chung Y, Kim AR, Lee YJ, Kim ES, Nam H, Park J, Lee JY, Shin EC, Seo SI, Park SH. CEACAM1 marks highly suppressive intratumoral regulatory T cells for targeted depletion therapy. Clin Cancer Res 2023; 29:1794-1806. [PMID: 36716293 DOI: 10.1158/1078-0432.ccr-22-1843] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2022] [Revised: 12/11/2022] [Accepted: 01/26/2023] [Indexed: 02/01/2023]
Abstract
PURPOSE Regulatory T cells (Tregs) exert immunosuppressive functions and hamper anti-tumor immune responses in the tumor microenvironment. Understanding the heterogeneity of intratumoral Tregs, and how it changes with tumor progression, will provide clues regarding novel target molecules of Treg-directed therapies. EXPERIMENTAL DESIGN From 42 patients with renal cell carcinoma and 5 patients with ovarian cancer, immune cells from tumor and peripheral blood were isolated. We performed multicolor flow cytometry and RNA-sequencing to characterize the phenotypes and heterogeneity of intratumoral Tregs. In vitro functional assays were performed to evaluate suppressive capacity of Tregs and effect of CEACAM1-mediated depletion. The CT26 tumor model was used to evaluate the association between intratumoral Tregs and tumor growth, and examine the in vivo role of CEACAM1+ intratumoral Tregs on anti-tumor immunity. RESULTS We found that carcinoembryonic antigen-related cell adhesion molecule 1 (CEACAM1) was selectively expressed on intratumoral Tregs, while its expression on peripheral Tregs or other immune cells was low. The CEACAM1+ intratumoral Tregs accumulated with tumor progression, while the CEACAM1- subset did not. Notably, we found that CEACAM1 marked intratumoral Tregs that exhibited highly suppressive and activated phenotypes with substantial clonal expansion. Depletion of CEACAM1-expressing cells from tumor-infiltrating leukocytes led to increased effector functions of tumor-infiltrating T cells. Moreover, CEACAM1+ cell depletion further enhanced anti-PD-1--mediated reinvigoration of exhausted CD8+ T cells. CONCLUSIONS CEACAM1 marks highly suppressive subset of intratumoral Tregs, and can be a target for selective depletion of intratumoral Tregs. These results may inform future studies on CEACAM1-mediated depletion in cancer patients.
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Affiliation(s)
- Seung Hyuck Jeon
- Korea Advanced Institute of Science and Technology, Korea (South), Republic of
| | - Minyong Kang
- Sungkyunkwan University School of Medicine, Samsung Medical Center, Seoul, Korea (South), Republic of
| | - Minwoo Jeon
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Youseung Chung
- Korea Advanced Institute of Science and Technology, Korea (South), Republic of
| | - A Reum Kim
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Yong Joon Lee
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Eui-Soon Kim
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Heejin Nam
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Junsik Park
- Yonsei University College of Medicine, Seoul, Korea (South), Republic of
| | - Jung-Yun Lee
- Yonsei University College of Medicine, Seoul, Korea (South), Republic of
| | - Eui-Cheol Shin
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
| | - Seong Il Seo
- Samsung Medical Center, Seoul, Korea (South), Republic of
| | - Su-Hyung Park
- Korea Advanced Institute of Science and Technology, Daejeon, Korea (South), Republic of
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Jeon SH, Chie EK. Characterization of the gene signature correlated with favorable response to chemoradiotherapy in rectal cancer: A hypothesis-generating study. Cancer Med 2023; 12:8981-8990. [PMID: 36621808 PMCID: PMC10134325 DOI: 10.1002/cam4.5586] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2022] [Revised: 11/17/2022] [Accepted: 12/21/2022] [Indexed: 01/10/2023] Open
Abstract
PURPOSE This study aimed to define the gene signature associated with response to neoadjuvant chemoradiotherapy (nCRT), or chemoradiosensitivity (CRS) signature, in rectal cancer, and investigate the correlation between the CRS signature and characteristics of tumor. MATERIALS AND METHODS Three public microarray datasets of pre-nCRT rectal cancer were used to discover and validate the CRS signature, and the pathway analysis of the CRS signature was performed. Patients in The Cancer Genome Atlas (TCGA) dataset were stratified according to the CRS signature enrichment score, and mutational profile and proportions of infiltrated immune cells were compared. RESULTS In the discovery dataset (GSE53781), 95 genes were upregulated in complete responders compared to non-complete responders and defined as the CRS signature. Pathways regarding DNA replication and repair processes as well as inflammatory response were enriched in the CRS signature. In the validation datasets (GSE35452 and GSE45404), patients with favorable response to nCRT exhibited higher enrichment score of the CRS. In TCGA-READ cohort, patients with high CRS signature harbored KRAS mutation in lower frequency than those with low CRS signature. In addition, proportions of proinflammatory immune cells were higher, but proportion of immunosuppressive M2 macrophages was lower in patients with high CRS signature than those with low CRS signature. CONCLUSIONS The current integrative bioinformatic analysis suggests the CRS signature and showed that the CRS signature is associated with dissimilar mutational profile and increased immune response. The discovered CRS signature and related characteristics may serve as candidate of stratification factor in upcoming studies for rectal cancer.
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Affiliation(s)
- Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
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11
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Kim JS, Lee JH, Jeon SR, Kim Y, Jeon SH, Wu HG. Identification of Genes Involved in EGF-induced Apoptosis Using CRISPR/Cas9 Knockout Screening: Implications for Novel Therapeutic Targets in EGFR-Overexpressing Cancers. Cancer Res Treat 2023:crt.2022.1414. [PMID: 36596724 PMCID: PMC10372596 DOI: 10.4143/crt.2022.1414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2022] [Accepted: 01/03/2023] [Indexed: 01/05/2023] Open
Abstract
Purpose Exogenous epidermal growth factor (EGF) causes apoptosis in EGF receptor (EGFR)-overexpressing cell lines. The apoptosis-inducing factors could be a therapeutic target. We aimed to determine the mechanism of EGF-induced apoptosis using a genome-wide clustered regularly interspaced short palindromic repeat (CRISPR)-based knockout screen. Materials and Methods Two-vector system of the human genome-scale CRISPR knockout library v2 was used to target 19,050 genes using 123,411 single guide RNAs (sgRNAs). Recombinant human EGF (100 nM) or distilled water four times was administered to the experimental and control groups, respectively. The read counts of each sgRNA obtained from next-generation sequencing were analyzed using the edgeR algorithm. We used another EGFR-overexpressing cell line (A549) and short hairpin RNAs (shRNAs) targeting five EGF-resistance genes for validation. DUSP1 expression in A431, A549, and HEK293FT cells was calculated using reverse transcription-quantitative polymerase chain reaction. Results We found 77 enriched and 189 depleted genes in the experimental group using the CRISPR-based knockout screen and identified the top five EGF-resistance genes: DDX20, LHFP, REPS1, DUSP1, and KRTAP10-12. Transfecting shRNAs targeting these genes into A549 cells significantly increased the surviving fractions after EGF treatment, compared with those observed in the control shRNA-transfected cells. The expression ratio of DUSP1 (inhibits ERK signaling) increased in A431 and A549 cells after EGF treatment. However, DUSP1 expression remained unchanged in HEK293FT cells after EGF treatment. Conclusion The CRISPR-based knockout screen revealed 266 genes possibly responsible for EGF-induced apoptosis. DUSP1 might be a critical component of EGF-induced apoptosis and a novel target for EGFR-overexpressing cancers.
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Affiliation(s)
- Jae Sik Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.,Department of Radiation Oncology, Soonchunhyang University Seoul Hospital, Seoul, Korea
| | - Joo Ho Lee
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
| | - Sang-Rok Jeon
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - Yongsub Kim
- Department of Biomedical Sciences, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea
| | - Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Hong-Gyun Wu
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea
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12
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Jeon SH, Kim SW, Na K, Seo M, Sohn YM, Lim YJ. Radiomic models based on magnetic resonance imaging predict the spatial distribution of CD8 + tumor-infiltrating lymphocytes in breast cancer. Front Immunol 2022; 13:1080048. [PMID: 36601118 PMCID: PMC9806253 DOI: 10.3389/fimmu.2022.1080048] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Accepted: 12/07/2022] [Indexed: 12/23/2022] Open
Abstract
Infiltration of CD8+ T cells and their spatial contexture, represented by immunophenotype, predict the prognosis and therapeutic response in breast cancer. However, a non-surgical method using radiomics to evaluate breast cancer immunophenotype has not been explored. Here, we assessed the CD8+ T cell-based immunophenotype in patients with breast cancer undergoing upfront surgery (n = 182). We extracted radiomic features from the four phases of dynamic contrast-enhanced magnetic resonance imaging, and randomly divided the patients into training (n = 137) and validation (n = 45) cohorts. For predicting the immunophenotypes, radiomic models (RMs) that combined the four phases demonstrated superior performance to those derived from a single phase. For discriminating the inflamed tumor from the non-inflamed tumor, the feature-based combination model from the whole tumor (RM-wholeFC) showed high performance in both training (area under the receiver operating characteristic curve [AUC] = 0.973) and validation cohorts (AUC = 0.985). Similarly, the feature-based combination model from the peripheral tumor (RM-periFC) discriminated between immune-desert and excluded tumors with high performance in both training (AUC = 0.993) and validation cohorts (AUC = 0.984). Both RM-wholeFC and RM-periFC demonstrated good to excellent performance for every molecular subtype. Furthermore, in patients who underwent neoadjuvant chemotherapy (n = 64), pre-treatment images showed that tumors exhibiting complete response to neoadjuvant chemotherapy had significantly higher scores from RM-wholeFC and lower scores from RM-periFC. Our RMs predicted the immunophenotype of breast cancer based on the spatial distribution of CD8+ T cells with high accuracy. This approach can be used to stratify patients non-invasively based on the status of the tumor-immune microenvironment.
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Affiliation(s)
- Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Republic of Korea
| | - So-Woon Kim
- Department of Pathology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Kiyong Na
- Department of Pathology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Mirinae Seo
- Department of Radiology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Yu-Mee Sohn
- Department of Radiology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Yu Jin Lim
- Department of Radiation Oncology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea,*Correspondence: Yu Jin Lim,
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13
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Chuah S, Lee J, Song Y, Kim HD, Wasser M, Kaya NA, Bang K, Lee YJ, Jeon SH, Suthen S, A'Azman S, Gien G, Lim CJ, Chua C, Hazirah SN, Lee HK, Lim JQ, Lim TKH, Yeong J, Chen J, Shin EC, Albani S, Zhai W, Yoo C, Liu H, Choo SP, Tai D, Chew V. Uncoupling immune trajectories of response and adverse events from anti-PD-1 immunotherapy in hepatocellular carcinoma. J Hepatol 2022; 77:683-694. [PMID: 35430299 DOI: 10.1016/j.jhep.2022.03.039] [Citation(s) in RCA: 30] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/09/2021] [Revised: 03/27/2022] [Accepted: 03/31/2022] [Indexed: 02/06/2023]
Abstract
BACKGROUND & AIMS While immune checkpoint blockade (ICB) has shown promise in patients with hepatocellular carcinoma (HCC), it is associated with modest response rates and immune-related adverse events (irAEs) are common. In this study, we aimed to decipher immune trajectories and mechanisms of response and/or irAEs in patients with HCC receiving anti-programmed cell death 1 (anti-PD-1) therapy. METHODS Pre- and on-treatment peripheral blood samples (n = 60) obtained from 32 patients with HCC (Singapore cohort) were analysed by cytometry by time-of-flight and single-cell RNA sequencing, with flow cytometric validation in an independent Korean cohort (n = 29). Mechanistic validation was conducted by bulk RNA sequencing of 20 pre- and on-treatment tumour biopsies and using a murine HCC model treated with different immunotherapeutic combinations. RESULTS Single-cell analyses identified CXCR3+CD8+ effector memory T (TEM) cells and CD11c+ antigen-presenting cells (APC) as associated with response (p = 0.0004 and 0.0255, respectively), progression-free survival (p = 0.00079 and 0.0015, respectively), and irAEs (p = 0.0034 and 0.0125, respectively) in anti-PD-1-treated patients with HCC. Type-1 conventional dendritic cells were identified as the specific APC associated with response, while 2 immunosuppressive CD14+ myeloid clusters were linked to reduced irAEs. Further analyses of CXCR3+CD8+ TEM cells showed cell-cell interactions specific to response vs. irAEs, from which the anti-PD-1 and anti-TNFR2 combination was harnessed to uncouple these effects, resulting in enhanced response without increased irAEs in a murine HCC model. CONCLUSIONS This study identifies early predictors of clinical response to anti-PD-1 ICB in patients with HCC and offers mechanistic insights into the immune trajectories of these immune subsets at the interface between response and toxicity. We also propose a new combination immunotherapy for HCC to enhance response without exacerbating irAEs. CLINICAL TRIAL NUMBER NCT03695952. LAY SUMMARY Response rates to immune checkpoint blockade (ICB) treatment in hepatocellular carcinoma (HCC) remain modest and adverse events are common. Herein, we identified early predictors of response and gained an in-depth understanding of the immunological mechanisms behind response and adverse events in patients with HCC treated with ICB. We also proposed a new combination immunotherapy for HCC that enhances response without exacerbating adverse events.
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Affiliation(s)
- Samuel Chuah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Joycelyn Lee
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore
| | - Yuan Song
- Immunology Programme, Life Sciences Institute, Immunology Translational Research Program and Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
| | - Hyung-Don Kim
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Martin Wasser
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore
| | - Neslihan A Kaya
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore; School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore
| | - Kyunghye Bang
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Yong Joon Lee
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Sheena Suthen
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Shamirah A'Azman
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Gerald Gien
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Chun Jye Lim
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Camillus Chua
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Sharifah Nur Hazirah
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore
| | - Hong Kai Lee
- Singapore Immunology Network (SIgN), A∗STAR, Singapore 138648, Singapore
| | - Jia Qi Lim
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore
| | - Tony K H Lim
- Duke-NUS Medical School, Singapore 169857, Singapore; Department of Anatomical Pathology, Singapore General Hospital (SGH), Singapore 169856, Singapore
| | - Joe Yeong
- Duke-NUS Medical School, Singapore 169857, Singapore; Department of Anatomical Pathology, Singapore General Hospital (SGH), Singapore 169856, Singapore; Institute of Molecular and Cell Biology (IMCB), Agency for Science, Technology and Research (A∗STAR), Singapore 138673, Singapore
| | - Jinmiao Chen
- Singapore Immunology Network (SIgN), A∗STAR, Singapore 138648, Singapore
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
| | - Salvatore Albani
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore
| | - Weiwei Zhai
- Genome Institute of Singapore (GIS), Agency for Science, Technology and Research (A∗STAR), Singapore 138672, Singapore; Key Laboratory of Zoological Systematics and Evolution, Institute of Zoology, Chinese Academy of Sciences, Beijing 100107, China; Center for Excellence in Animal Evolution and Genetics, Chinese Academy of Sciences, Kunming 650223, China
| | - Changhoon Yoo
- Department of Oncology, Asan Medical Center (AMC), University of Ulsan College of Medicine, 88, Olympic-ro 43-gil, Songpa-gu, Seoul 05505, Republic of Korea
| | - Haiyan Liu
- Immunology Programme, Life Sciences Institute, Immunology Translational Research Program and Department of Microbiology and Immunology, Yong Loo Lin School of Medicine, National University of Singapore, Singapore 117456, Singapore
| | - Su Pin Choo
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore; Curie Oncology, Mount Elizabeth Novena Specialist Centre, Singapore 329563, Singapore
| | - David Tai
- Division of Medical Oncology, National Cancer Centre Singapore, Singapore 169610, Singapore.
| | - Valerie Chew
- Translational Immunology Institute (TII), SingHealth-DukeNUS Academic Medical Centre, Singapore 169856, Singapore; Duke-NUS Medical School, Singapore 169857, Singapore.
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14
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Lee YJ, Kim JY, Jeon SH, Nam H, Jung JH, Jeon M, Kim ES, Bae SJ, Ahn J, Yoo TK, Sun WY, Ahn SG, Jeong J, Park SH, Park WC, Kim SI, Shin EC. CD39 + tissue-resident memory CD8 + T cells with a clonal overlap across compartments mediate antitumor immunity in breast cancer. Sci Immunol 2022; 7:eabn8390. [PMID: 36026440 DOI: 10.1126/sciimmunol.abn8390] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
Despite being a standard treatment option in breast cancer, immune checkpoint inhibitors (ICIs) are only efficacious for a subset of patients. To gain a better understanding of the antitumor immune response in breast cancer, we examined the heterogeneity of CD8+ T cells in tumors, metastatic lymph nodes (mLNs), and peripheral blood from patients with early breast cancer (n = 131). Among tissue-resident memory CD8+ T (TRM) cells, including virus- and tumor-specific CD8+ T cells, CD39 expression was observed in a tumor-specific and exhausted subpopulation in both tumors and mLNs. CD39+ TRM cells from tumors and mLNs exhibited a phenotypic similarity and clonally overlapped with each other. Moreover, tumor or mLN CD39+ TRM cells clonally overlapped with CD39- TRM and non-TRM cells in the same compartment, implying a tissue-specific differentiation process. These inter-subpopulationally overlapping CD39+ TRM clonotypes were frequently detected among effector memory CD8+ T cells in peripheral blood, suggesting a systemic clonal overlap. CD39+ TRM cell enrichment was heterogeneous among molecular subtypes of breast cancer, which is associated with the different role of antitumor immune responses in each subtype. In vitro blockade of PD-1 and/or CTLA-4 effectively restored proliferation of CD39+ TRM cells and enhanced cytokine production by CD8+ T cells from tumors or mLNs, particularly in the presence of CD39+ TRM enrichment. This suggests that CD39+ TRM cells have a capacity for functional restoration upon ICI treatment. Thus, our study indicates that CD39+ TRM cells with a clonal overlap across compartments are key players in antitumor immunity in breast cancer.
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Affiliation(s)
- Yong Joon Lee
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea.,Department of Surgery, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
| | - Jee Ye Kim
- Department of Surgery, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
| | - Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Heejin Nam
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Jae Hyung Jung
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Minwoo Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Eui-Soon Kim
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Soong June Bae
- Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Republic of Korea
| | - Juneyoung Ahn
- Department of Surgery, Uijeongbu St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul 11765, Republic of Korea
| | - Tae-Kyung Yoo
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul 06591, Republic of Korea
| | - Woo Young Sun
- Department of Surgery, Daejeon St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul 34943, Republic of Korea
| | - Sung Gwe Ahn
- Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Republic of Korea
| | - Joon Jeong
- Department of Surgery, Gangnam Severance Hospital, Yonsei University College of Medicine, Seoul 06273, Republic of Korea
| | - Su-Hyung Park
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
| | - Woo Chan Park
- Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, Catholic University of Korea, Seoul 06591, Republic of Korea
| | - Seung Il Kim
- Department of Surgery, Yonsei University College of Medicine, Seoul 03722, Republic of Korea
| | - Eui-Cheol Shin
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon 34141, Republic of Korea
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15
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Jang BS, Chang JH, Jeon SH, Song MG, Lee KH, Im SA, Kim JI, Kim TY, Chie EK. Radiation Response Prediction Model based on Integrated Clinical and Genomic Data Analysis. Cancer Res Treat 2021; 54:383-395. [PMID: 34425668 PMCID: PMC9016297 DOI: 10.4143/crt.2021.759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2021] [Accepted: 08/23/2021] [Indexed: 11/21/2022] Open
Abstract
Purpose The value of the genomic profiling by targeted gene-sequencing on radiation therapy response prediction was evaluated through integrated analysis including clinical information. Radiation response prediction model was constructed based on the analyzed findings. Materials and Methods Patients who had the tumor sequenced using institutional cancer panel after informed consent and received radiotherapy for the measurable disease served as the target cohort. Patients with irradiated tumor locally controlled for more than 6 months after radiotherapy were defined as the durable local control (DLC) group, otherwise, non-durable local control (NDLC) group. Significant genomic factors and domain knowledge were used to develop the Bayesian Network model to predict radiotherapy response. Results Altogether, 88 patients were collected for analysis. Of those, 41 (43.6%) and 47 (54.4%) patients were classified as the NDLC and DLC group, respectively. Somatic mutations of NOTCH2 and BCL were enriched in the NDLC group, whereas, mutations of CHEK2, MSH2, and NOTCH1 were more frequently found in the DLC group. Altered DNA repair pathway was associated with better local failure-free survival (HR 0.40, 95%CI 0.19-0.86, p=0.014). Smoking somatic signature was found more frequently in the DLC group. AUC of the Bayesian Network model predicting probability of 6-month local control was 0.83. Conclusion Durable radiation response was associated with alterations of DNA repair pathway and smoking somatic signature. Bayesian network model could provide helpful insights for high precision radiotherapy. However, these findings should be verified in prospective cohort for further individualization.
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Affiliation(s)
- Bum-Sup Jang
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Ji-Hyun Chang
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
| | - Seung Hyuck Jeon
- Graduate School of Medical Science and Engineering, Korea Advanced Institute of Science and Technology, Daejeon, Korea
| | - Myung Geun Song
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
| | - Kyung-Hun Lee
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Seock-Ah Im
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Jong-Il Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Tae-You Kim
- Department of Internal Medicine, Seoul National University Hospital, Seoul, Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University, Seoul, Korea
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16
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Lee JH, Jeon SH, Park CK, Park SH, Yoon HI, Chang JH, Suh CO, Kang SJ, Lim DH, Kim IA, Kim JH, Im JH, Kim SH, Wee CW, Kim IH. The Role of Postoperative Radiotherapy in Intracranial Solitary Fibrous Tumor/Hemangiopericytoma: A Multi-Institutional Retrospective Study (KROG 18-11). Cancer Res Treat 2021; 54:65-74. [PMID: 33781051 PMCID: PMC8756112 DOI: 10.4143/crt.2021.142] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2021] [Accepted: 03/23/2021] [Indexed: 11/21/2022] Open
Abstract
Purpose To evaluate the role of postoperative radiotherapy (PORT) in intracranial solitary fibrous tumor/hemangiopericytoma (SFT/HPC). Methods and Materials A total of 133 patients with histologically confirmed HPC were included from 8 institutions. Gross total resection (GTR) and subtotal resection (STR) were performed in 86 and 47 patients, respectively. PORT was performed in 85 (64%) patients. The prognostic effects of sex, age, performance, WHO grade, location, size, Ki-67, surgical extent, and PORT on local control (LC), distant metastasis-free survival (DMFS), progression-free survival (PFS), and overall survival (OS) were estimated by univariate and multivariate analyses. Results The 10-year PFS, and OS rates were 45%, and 71%, respectively. The multivariate analysis suggested that PORT significantly improved LC (p<0.001) and PFS (p<0.001). The PFS benefit of PORT was maintained in the subgroup of GTR (p=0.001), WHO grade II (p=0.001) , or STR (p<0.001). In the favorable subgroup of GTR and WHO grade II, PORT was also significantly related to better PFS (p=0.028). WHO grade III was significantly associated with poor DMFS (p=0.029). In the PORT subgroup, the 0-0.5 cm margin of the target volume showed an inferior LC to a large margin with 1.0-2.0 cm (p=0.021). Time-dependent Cox proportion analysis showed that distant failures were significantly associated with poor OS (p=0.003). Conclusion This multicenter study supports the role of PORT in disease control of intracranial SFT/HPC, irrespective of the surgical extent and grade. For LC, PORT should enclose the tumor bed with sufficient margin.
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Affiliation(s)
- Joo Ho Lee
- Department of Radiation Oncology, Seoul National University Hospital, Seoul National University, College of Medicine, Seoul, Korea.,Institute of Radiation Medicine, Medical Research Center, Seoul National University Hospital, Seoul, Korea
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Hospital, Seoul National University, College of Medicine, Seoul, Korea
| | - Chul-Kee Park
- Department of Neurosurgery, Seoul National University Hospital, Seoul, Korea
| | - Sung-Hye Park
- Department of Pathology, Seoul National University, College of Medicine, Yonsei Cancer Center, Yonsei University Health System, Seoul, Korea
| | - Hong In Yoon
- Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University Health System, Seoul, Korea
| | - Jong Hee Chang
- Department of Neurosurgery, Severance Hospital, Yonsei University Health System, Seoul, Korea
| | - Chang-Ok Suh
- Department of Radiation Oncology, Yonsei Cancer Center, Yonsei University Health System, Seoul, Korea.,Department of Radiation Oncology, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Su Jeong Kang
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - Do Hoon Lim
- Department of Radiation Oncology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnam, Korea
| | - Jin Hee Kim
- Department of Radiation Oncology, Keimyung University Dongsan Hospital, School of Medicine, Daegu, Korea
| | - Jung Ho Im
- Department of Radiation Oncology, CHA Bundang Medical Center, CHA University School of Medicine, Seongnam, Korea
| | - Sung-Hwan Kim
- Department of Radiation Oncology, St. Vincent's Hospital, Suwon, Korea
| | - Chan Woo Wee
- Department of Radiation Oncology, SMG-SNU Boramae Medical Center, Seoul, Korea
| | - Il Han Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul National University, College of Medicine, Seoul, Korea
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Chie EK, Jeon SH, Lim YJ, Koh J, Kim S, Kim K. CD8 + tumor-infiltrating lymphocyte infiltration prediction with radiomic signature in locally advanced rectal cancer. J Clin Oncol 2021. [DOI: 10.1200/jco.2021.39.3_suppl.123] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
123 Background: Despite increasing use of cancer immunotherapies, no biomarker relevant to anti-tumor immunity has been developed in rectal cancer. The present study aims to develop a radiomic signature to predict the infiltration of CD8+ tumor-infiltrating lymphocytes (TILs). Methods: In total, 131 patients undergoing neoadjuvant chemoradiotherapy (CRT) from 2005 to 2012 were analyzed. The study included pre-CRT dataset A ( n = 113; n = 75 and 38 for training and validation) and post-CRT datasets B ( n = 32; predominance of tumor) and C ( n = 20; pure fibrosis). To build the radiomic signature, 38 features selected from pre-CRT T2-weighted MRI scans were incorporated into the least absolute shrinkage and selection operator method. Results: Higher CD8+ TIL infiltration was associated with better overall and progression-free survival ( P = 0.01 and 0.03, respectively). In pre-CRT dataset A, the area under the receiver operating characteristic curve values of radiomic score for predicting CD8+ TILs were 0.760 and 0.729 for training and validation subsets, respectively. A significant correlation was observed between the radiomic signature and CD8+ TIL density in the post-CRT dataset B (Pearson’s R = ‒0.372, P = 0.036), whereas no association was found within the dataset C accounting for pure fibrosis after CRT (Pearson’s R = ‒0.069, P = 0.77). Conclusions: We established the MRI-derived radiomic signature for predicting CD8+ TIL infiltration in the contemporary treatment era of rectal cancer. The noninvasive characterization of tumor immune status would provide insights into the role of radiomic-pathology modeling to predict the local immune phenotypes.
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Affiliation(s)
- Eui Kyu Chie
- Seoul National University College of Medicine, Seoul, South Korea
| | - Seung Hyuck Jeon
- Korea Advanced Institute of Science and Technology, Daejeon, South Korea
| | - Yu Jin Lim
- Kyung Hee University College of Medicine, Seoul, South Korea
| | - Jaemoon Koh
- Seoul National University College of Medicine, Seoul, South Korea
| | - Sehui Kim
- Seoul National University Hospital, Seoul, South Korea
| | - Kyubo Kim
- Ewha University College of Medicine, Seoul, South Korea
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Lim YJ, Song C, Jeon SH, Kim K, Chie EK. Risk Stratification Using Neoadjuvant Rectal Score in the Era of Neoadjuvant Chemoradiotherapy: Validation With Long-term Outcome Data. Dis Colon Rectum 2021; 64:60-70. [PMID: 33306532 DOI: 10.1097/dcr.0000000000001777] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 01/31/2023]
Abstract
BACKGROUND Despite the widespread use of neoadjuvant chemoradiotherapy, there is no prognostic surrogate marker established in locally advanced rectal cancer. OBJECTIVE This study evaluated the role of neoadjuvant rectal score as a prognostic factor to stratify individual-level risks of survival and tumor recurrence. DESIGN This is a retrospective study. SETTINGS This study was conducted at the Seoul National University Hospital. PATIENTS A total of 397 patients who underwent chemoradiotherapy plus total mesorectal excision were analyzed. INTERVENTIONS There was no intervention. MAIN OUTCOME MEASURES Harrell C statistic and receiver operating characteristic analysis, as well as Cox regression analysis, were used to assess the prognostic strength. RESULTS The low (<8), intermediate (8-16), and high (>16) neoadjuvant rectal score groups included 91 (23%), 208 (52%), and 98 patients (25%). A high neoadjuvant rectal score was independently associated with inferior overall survival and disease-free survival (p = 0.011 and 0.008). Regarding the prognostic models adjusted for neoadjuvant rectal score (I) and ypT/N stage (II), the c-index was higher in model I (0.799 and 0.787, p = 0.009 for overall survival; 0.752 and 0.743, p = 0.093 for disease-free survival). The predictive ability of the neoadjuvant rectal score was superior to tumor regression grade, ypT, and ypN in the receiver operating characteristic analyses (p < 0.05 for all). Adjuvant chemotherapy was associated with better overall and disease-free survival (p = 0.003 and 0.052) in the high neoadjuvant rectal score group. LIMITATIONS Potential selection bias attributed to the retrospective study design was a limitation. CONCLUSIONS We verified the applicability of the neoadjuvant rectal score to stratify the relapse risk at the individual level for patients with stage II/III rectal cancer undergoing neoadjuvant chemoradiotherapy. Additional studies are needed to validate the usability of neoadjuvant rectal score levels as a determinant of adjuvant strategy. See Video Abstract at http://links.lww.com/DCR/B354. ESTRATIFICACIÓN DE RIESGO UTILIZANDO LA PUNTUACIÓN RECTAL NEOADYUVANTE EN LA ERA DE LA QUIMIORRADIOTERAPIA NEOADYUVANTE: VALIDACIÓN CON DATOS DE RESULTADOS A LARGO PLAZO: A pesar del uso generalizado de la quimiorradioterapia neoadyuvante, no existe un marcador subrogado pronóstico establecido en el cáncer de recto localmente avanzado.Este estudio evaluó el papel de la puntuación rectal neoadyuvante como factor pronóstico para estratificar los riesgos a nivel individual de supervivencia y recurrencia tumoral.Este es un estudio retrospectivo.Este estudio se realizó en el Hospital de la Universidad Nacional de Seúl.Se analizaron un total de 397 pacientes que se sometieron a quimiorradioterapia más escisión mesorrectal total.No hubo intervención.El análisis estadístico C de Harrell y las características operativas del receptor, así como el análisis de regresión de Cox, se utilizaron para evaluar la fuerza pronóstica.Los grupos de puntaje rectal neoadyuvante bajo (<8), intermedio (8-16) y alto (> 16) incluyeron 91 (23%), 208 (52%) y 98 (25%) pacientes, respectivamente. Una puntuación rectal neoadyuvante alta se asoció independientemente con una supervivencia general y una supervivencia libre de enfermedad inferiores (p = 0.011 y 0.008, respectivamente). Con respecto a los modelos pronósticos ajustados por la puntuación rectal neoadyuvante (I) y el estadio ypT/N (II), el índice c fue mayor en el modelo I (0.799 y 0.787, p = 0.009 para la supervivencia general; 0.752 y 0.743, p = 0.093 para supervivencia libre de enfermedad). La capacidad predictiva de la puntuación rectal neoadyuvante fue superior al grado de regresión tumoral, ypT y ypN en los análisis de características operativas del receptor (p <0.05 para todos). La quimioterapia adyuvante se asoció con una mejor supervivencia global y libre de enfermedad (p = 0.003 y 0.052, respectivamente) en el grupo de puntaje rectal neoadyuvante alto.El sesgo de selección potencial debido al diseño retrospectivo del estudio fue la limitación.Verificamos la aplicabilidad de la puntuación rectal neoadyuvante para estratificar el riesgo de recurrencia a nivel individual para pacientes con cáncer rectal en estadio II/III sometidos a quimiorradioterapia neoadyuvante. Se necesitan más estudios para validar la usabilidad de los niveles de puntuación rectal neoadyuvante como determinante de la estrategia adyuvante. Consulte Video Resumen en http://links.lww.com/DCR/B354.
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Affiliation(s)
- Yu Jin Lim
- Department of Radiation Oncology, Kyung Hee University College of Medicine, Kyung Hee University Medical Center, Seoul, Republic of Korea
| | - Changhoon Song
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Kyubo Kim
- Department of Radiation Oncology, Ewha University College of Medicine, Seoul, Republic of Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
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Choi JH, Jang HI, Jang JS, Jeon SH, Joo KK, Ju K, Jung DE, Kim JG, Kim JH, Kim JY, Kim SB, Kim SY, Kim W, Kwon E, Lee DH, Lee HG, Lim IT, Moon DH, Pac MY, Seo H, Seo JW, Shin CD, Yang BS, Yoo J, Yoon SG, Yeo IS, Yu I. Search for Sub-eV Sterile Neutrinos at RENO. Phys Rev Lett 2020; 125:191801. [PMID: 33216576 DOI: 10.1103/physrevlett.125.191801] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2020] [Revised: 10/08/2020] [Accepted: 10/09/2020] [Indexed: 06/11/2023]
Abstract
We report a search result for a light sterile neutrino oscillation with roughly 2200 live days of data in the RENO experiment. The search is performed by electron antineutrino (ν[over ¯]_{e}) disappearance taking place between six 2.8 GW_{th} reactors and two identical detectors located at 294 m (near) and 1383 m (far) from the center of the reactor array. A spectral comparison between near and far detectors can explore reactor ν[over ¯]_{e} oscillations to a light sterile neutrino. An observed spectral difference is found to be consistent with that of the three-flavor oscillation model. This yields limits on sin^{2}2θ_{14} in the 10^{-4}≲|Δm_{41}^{2}|≲0.5 eV^{2} region, free from reactor ν[over ¯]_{e} flux and spectrum uncertainties. The RENO result provides the most stringent limits on sterile neutrino mixing at |Δm_{41}^{2}|≲0.002 eV^{2} using the ν[over ¯]_{e} disappearance channel.
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Affiliation(s)
- J H Choi
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - H I Jang
- Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea
| | - J S Jang
- GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
| | - S H Jeon
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - K K Joo
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - K Ju
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - D E Jung
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J G Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J H Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J Y Kim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - S B Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - S Y Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - W Kim
- Department of Physics, Kyungpook National University, Daegu 41566, Korea
| | - E Kwon
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - D H Lee
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - H G Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - I T Lim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - D H Moon
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - M Y Pac
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - H Seo
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - J W Seo
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - C D Shin
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - B S Yang
- Institute for Basic Science, Daejeon 34047, Korea
| | - J Yoo
- Department of Physics, KAIST, Daejeon 34141, Korea
- Institute for Basic Science, Daejeon 34047, Korea
| | - S G Yoon
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - I S Yeo
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - I Yu
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
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Jeon SH, Song C, Chie EK, Kim B, Kim YH, Chang W, Lee YJ, Chung JH, Chung JB, Lee KW, Kang SB, Kim JS. Combining Radiomics and Blood Test Biomarkers to Predict the Response of Locally Advanced Rectal Cancer to Chemoradiation. In Vivo 2020; 34:2955-2965. [PMID: 32871838 DOI: 10.21873/invivo.12126] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2020] [Revised: 07/06/2020] [Accepted: 07/08/2020] [Indexed: 12/29/2022]
Abstract
BACKGROUND/AIM A noninvasive method for predicting a patient's response to neoadjuvant chemoradiotherapy (nCRT) for locally advanced rectal cancer would be useful because this would help determine the subsequent treatment strategy. Two types of noninvasive biomarkers have previously been studied, based on radiomics and based on blood test parameters. We hypothesized that a combination of both types would provide a better predictive power, and this has not previously been investigated. PATIENTS AND METHODS Data from 135 patients with locally advanced rectal cancer who underwent nCRT were retrospectively allocated into training and validation cohorts in a 2:1 ratio. Sixty-five radiomics features were extracted from tumors segmented on T2-weighted magnetic resonance images. An elastic net was applied to generate four models for discerning the patients with good responses to nCRT based on radiomics features (model R), blood biomarkers (model B), both (model RB), and a linear combination of models R and B (model R+B). RESULTS Among 65 radiomics features, 17 were selected as robust features for model development. The AUC values of model R, model B, model RB, and model R+B achieved 0.751, 0.627, 0.785, and 0.711 in the training cohort (n=90), and 0.705, 0.603, 0.679, and 0.705 in validation cohort (n=45), respectively. In the entire cohort, models RB and R+B demonstrated a significantly better performance than model B but not R. There was no correlation between the scores of models R and B (p=0.76). Radiomics features had a greater influence than blood biomarkers on models RB and R+B. CONCLUSION A non-redundancy between radiomics features and blood-based biomarkers was observed. Furthermore, radiomics features are more valuable in terms of predicting response to nCRT. The importance of combining non-invasive biomarkers in future investigations is highlighted.
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Affiliation(s)
- Seung Hyuck Jeon
- Laboratory of Translational Immunology and Vaccinology, Graduate School of Medical Science and Engineering, KAIST, Daejeon, Republic of Korea
| | - Changhoon Song
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Bohyoung Kim
- Division of Biomedical Engineering, Hankuk University of Foreign Studies, Yongin, Republic of Korea
| | - Young Hoon Kim
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Won Chang
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Yoon Jin Lee
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Joo-Hyun Chung
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea
| | - Jin Beom Chung
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Keun-Wook Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Sung-Bum Kang
- Department of Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
| | - Jae-Sung Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, Seongnam, Republic of Korea
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Jeon SH, Chie EK, Kim YJ, Lee KH, Lee HS, Kim MJ, Im SA, Kim JI, Kim TY. Targeted next-generation DNA sequencing identifies Notch signaling pathway mutation as a predictor of radiation response. Int J Radiat Biol 2019; 95:1640-1647. [PMID: 31525117 DOI: 10.1080/09553002.2019.1665212] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Purpose: Identifying the association between somatic mutations and the radiation response of tumor is essential for understanding the mechanisms and practicing personalized radiotherapy. The present study aimed to discover specific genes or pathways that are associated with radiation response using targeted next-generation DNA sequencing.Material and methods: Fifty-five patients with various solid tumors whose specimen were sequenced using institutional panel which includes 148 cancer-related genes and received radiotherapy for a measurable tumor were analyzed. Patients with irradiated tumors in complete or partial remission for more than 6 months were defined as responders. Association between mutations including pathogenic single nucleotide variants and insertions/deletions in the 148 genes and 39 molecular pathways and radiation response was investigated.Results: Analyzing 17 responders and 38 non-responders, biologically effective dose (BED), but not concurrent chemotherapy, was associated with radiation response. No single gene correlated with radiation response. Mutations in Notch signaling pathway were associated with radiosensitivity after correction for multiple comparison (adjusted p = .094). When BED and Notch signaling pathway mutation were tested with logistic regression, both variables were associated with radiation response.Conclusions: Our results suggest that somatic mutations in Notch signaling pathway may be related to sensitivity to radiation, although these results should be validated in a larger and more homogeneous cohort.
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Affiliation(s)
- Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Korea
| | - Yi-Jun Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Korea
| | - Kyung-Hun Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Hyun-Seob Lee
- Biomedical Research Institute, Seoul National University Hospital, Seoul, Korea
| | - Min Jung Kim
- Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea
| | - Seock-Ah Im
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea
| | - Jong-Il Kim
- Department of Biomedical Sciences, Seoul National University College of Medicine, Seoul, Korea
| | - Tae-You Kim
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.,Department of Molecular Medicine and Biopharmaceutical Sciences, Graduate School of Convergence Science and Technology, Seoul National University, Seoul, Korea
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Bak G, Choi JH, Jang HI, Jang JS, Jeon SH, Joo KK, Ju K, Jung DE, Kim JG, Kim JH, Kim JY, Kim SB, Kim SY, Kim W, Kwon E, Lee DH, Lee HG, Lee YC, Lim IT, Moon DH, Pac MY, Park YS, Rott C, Seo H, Seo JW, Seo SH, Shin CD, Yang JY, Yoo J, Yu I. Fuel-Composition Dependent Reactor Antineutrino Yield at RENO. Phys Rev Lett 2019; 122:232501. [PMID: 31298906 DOI: 10.1103/physrevlett.122.232501] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/26/2018] [Revised: 05/16/2019] [Indexed: 06/10/2023]
Abstract
We report a fuel-dependent reactor electron antineutrino (ν[over ¯]_{e}) yield using six 2.8 GW_{th} reactors in the Hanbit nuclear power plant complex, Yonggwang, Korea. The analysis uses 850 666 ν[over ¯]_{e} candidate events with a background fraction of 2.0% acquired through inverse beta decay (IBD) interactions in the near detector for 1807.9 live days from August 2011 to February 2018. Based on multiple fuel cycles, we observe a fuel ^{235}U dependent variation of measured IBD yields with a slope of (1.51±0.23)×10^{-43} cm^{2}/fission and measure a total average IBD yield of (5.84±0.13)×10^{-43} cm^{2}/fission. The hypothesis of no fuel-dependent IBD yield is ruled out at 6.6σ. The observed IBD yield variation over ^{235}U isotope fraction does not show significant deviation from the Huber-Mueller (HM) prediction at 1.3 σ. The measured fuel-dependent variation determines IBD yields of (6.15±0.19)×10^{-43} and (4.18±0.26)×10^{-43} cm^{2}/fission for two dominant fuel isotopes ^{235}U and ^{239}Pu, respectively. The measured IBD yield per ^{235}U fission shows the largest deficit relative to the HM prediction. Reevaluation of the ^{235}U IBD yield per fission may mostly solve the reactor antineutrino anomaly (RAA) while ^{239}Pu is not completely ruled out as a possible contributor to the anomaly. We also report a 2.9 σ correlation between the fractional change of the 5 MeV excess and the reactor fuel isotope fraction of ^{235}U.
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Affiliation(s)
- G Bak
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - J H Choi
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - H I Jang
- Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea
| | - J S Jang
- GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
| | - S H Jeon
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - K K Joo
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - K Ju
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - D E Jung
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J G Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J H Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J Y Kim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - S B Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - S Y Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - W Kim
- Department of Physics, Kyungpook National University, Daegu 41566, Korea
| | - E Kwon
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - D H Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - H G Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Y C Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - I T Lim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - D H Moon
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - M Y Pac
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - Y S Park
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - C Rott
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - H Seo
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - J W Seo
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - S H Seo
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - C D Shin
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - J Y Yang
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - J Yoo
- Institute for Basic Science, Daejeon 34047, Korea
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - I Yu
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
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Jeon SH, Song C, Chie EK, Kim B, Kim YH, Chang W, Lee YJ, Chung JH, Chung JB, Lee KW, Kang SB, Kim JS. Delta-radiomics signature predicts treatment outcomes after preoperative chemoradiotherapy and surgery in rectal cancer. Radiat Oncol 2019; 14:43. [PMID: 30866965 PMCID: PMC6417065 DOI: 10.1186/s13014-019-1246-8] [Citation(s) in RCA: 65] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2019] [Accepted: 02/28/2019] [Indexed: 12/31/2022] Open
Abstract
Background To develop and compare delta-radiomics signatures from 2- (2D) and 3-dimensional (3D) features that predict treatment outcomes following preoperative chemoradiotherapy (CCRT) and surgery for locally advanced rectal cancer. Methods In total, 101 patients (training cohort, n = 67; validation cohort, n = 34) with locally advanced rectal adenocarcinoma between 2008 and 2015 were included. We extracted 55 features from T2-weighted magnetic resonance imaging (MRI) scans. Delta-radiomics feature was defined as the difference in radiomics feature before and after CCRT. Signatures were developed to predict local recurrence (LR), distant metastasis (DM), and disease-free survival (DFS) from 2D and 3D features. The least absolute shrinkage and selection operator regression was used to select features and build signatures. The delta-radiomics signatures and clinical factors were integrated into Cox regression analysis to determine if the signatures were independent prognostic factors. Results The radiomics signatures for LR, DM, and DFS were developed and validated using both 2D and 3D features. Outcomes were significantly different in the low- and high-risk patients dichotomized by optimal cutoff in both the training and validation cohorts. In multivariate analysis, the signatures were independent prognostic factors even when considering the clinical parameters. There were no significant differences in C-index from 2D vs. 3D signatures. Conclusions This is the first study to develop delta-radiomics signatures for rectal cancer. The signatures successfully predicted the outcomes and were independent prognostic factors. External validation is warranted to ensure their performance. Electronic supplementary material The online version of this article (10.1186/s13014-019-1246-8) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Changhoon Song
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Bohyoung Kim
- Division of Biomedical Engineering, Hankuk University of Foreign Studies, 81 Oedae-ro, Mohyeon-eup, Cheoin-gu, Yongin, 17035, Republic of Korea
| | - Young Hoon Kim
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Won Chang
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Yoon Jin Lee
- Department of Radiology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Joo-Hyun Chung
- Department of Radiation Oncology, Seoul National University College of Medicine, 101 Daehak-ro, Jongno-gu, Seoul, 03080, Republic of Korea
| | - Jin Beom Chung
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Keun-Wook Lee
- Department of Internal Medicine, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Sung-Bum Kang
- Department of Surgery, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea
| | - Jae-Sung Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul National University Bundang Hospital, 82 Gumi-ro 173beon-gil, Bundang-gu, Seongnam, 13620, Republic of Korea.
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24
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Bak G, Choi JH, Jang HI, Jang JS, Jeon SH, Joo KK, Ju K, Jung DE, Kim JG, Kim JH, Kim JY, Kim SB, Kim SY, Kim W, Kwon E, Lee DH, Lee HG, Lee YC, Lim IT, Moon DH, Pac MY, Park YS, Rott C, Seo H, Seo JW, Seo SH, Shin CD, Yang JY, Yoo J, Yu I. Measurement of Reactor Antineutrino Oscillation Amplitude and Frequency at RENO. Phys Rev Lett 2018; 121:201801. [PMID: 30500262 DOI: 10.1103/physrevlett.121.201801] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2018] [Revised: 09/13/2018] [Indexed: 06/09/2023]
Abstract
The RENO experiment reports more precisely measured values of θ_{13} and |Δm_{ee}^{2}| using ∼2200 live days of data. The amplitude and frequency of reactor electron antineutrino (ν[over ¯]_{e}) oscillation are measured by comparing the prompt signal spectra obtained from two identical near and far detectors. In the period between August 2011 and February 2018, the far (near) detector observed 103 212 (850 666) ν[over ¯]_{e} candidate events with a background fraction of 4.8% (2.0%). A clear energy and baseline dependent disappearance of reactor ν[over ¯]_{e} is observed in the deficit of the measured number of ν[over ¯]_{e}. Based on the measured far-to-near ratio of prompt spectra, we obtain sin^{2}2θ_{13}=0.0896±0.0048(stat)±0.0047(syst) and |Δm_{ee}^{2}|=[2.68±0.12(stat)±0.07(syst)]×10^{-3} eV^{2}.
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Affiliation(s)
- G Bak
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - J H Choi
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - H I Jang
- Department of Fire Safety, Seoyeong University, Gwangju 61268, Korea
| | - J S Jang
- GIST College, Gwangju Institute of Science and Technology, Gwangju 61005, Korea
| | - S H Jeon
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - K K Joo
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - K Ju
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - D E Jung
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J G Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J H Kim
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - J Y Kim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - S B Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - S Y Kim
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - W Kim
- Department of Physics, Kyungpook National University, Daegu 41566, Korea
| | - E Kwon
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - D H Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - H G Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - Y C Lee
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - I T Lim
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - D H Moon
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - M Y Pac
- Institute for High Energy Physics, Dongshin University, Naju 58245, Korea
| | - Y S Park
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - C Rott
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - H Seo
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - J W Seo
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
| | - S H Seo
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - C D Shin
- Institute for Universe and Elementary Particles, Chonnam National University, Gwangju 61186, Korea
| | - J Y Yang
- Department of Physics and Astronomy, Seoul National University, Seoul 08826, Korea
| | - J Yoo
- Institute for Basic Science, Daejeon 34047, Korea
- Department of Physics, KAIST, Daejeon 34141, Korea
| | - I Yu
- Department of Physics, Sungkyunkwan University, Suwon 16419, Korea
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25
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Jeon W, Jang BS, Jeon SH, Kim JH, Kim YJ, Kim SH, Kim CY, Han JH, Kim IA. Analysis of survival outcomes based on molecular subtypes in breast cancer brain metastases: A single institutional cohort. Breast J 2018; 24:920-926. [PMID: 30596408 DOI: 10.1111/tbj.13111] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/04/2017] [Revised: 11/12/2017] [Accepted: 11/16/2017] [Indexed: 12/01/2022]
Abstract
PURPOSE To evaluate the survival outcomes based on molecular subtypes of breast cancer in patients with brain metastasis. MATERIALS AND METHODS We retrospectively reviewed 106 breast cancer patients treated for brain metastases, from January 2005 to May 2016. Patients were divided into four groups based on the tumor molecular subtype: luminal A (Estrogen Receptor [ER]/Progesterone Receptor [PR] positive, human epithelial growth factor receptor-2 [HER2] negative), luminal B (ER/PR positive, HER2 Positive), HER2 (HER2 positive and ER/PR negative), and Triple negative (TNBC). RESULTS The median follow-up time for surviving patients was 22 months (range: 11.2-51.1 months). The median survival of all patients was 14 months, with a 1-year overall survival (OS) rate of 57.5% and a 2-year OS rate of 32.1%. Thirty patients (28.3%) had a solitary brain metastasis while 62 (58.5%) patients had multiple metastases. A significant difference was observed in the survival rates of the two groups. Based on the Karnofsky performance score, the performance status of the patients at the time of brain metastasis was also found to affect survival. Patients with different molecular subtypes had different survival rates; the luminal A group showed the highest median survival (luminal A: 23.1, luminal B: 15.0, HER2: 12.5 and TNBC: 6.4 months, respectively), which was statistically significant. CONCLUSION In breast cancer patients with brain metastasis, survival rates were different based on the molecular subtype of the tumor, despite various local and systemic treatments. Appropriate and tailored treatment approaches should, therefore, be considered for the different molecular subtypes.
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Affiliation(s)
- Wan Jeon
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Bum-Sup Jang
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Jee Hyun Kim
- Department of Internal medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Yu Jung Kim
- Department of Internal medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Se Hyun Kim
- Department of Internal medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Chae-Yong Kim
- Department of Neurosurgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - Jung Ho Han
- Department of Neurosurgery, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea.,Department of Internal medicine, Seoul National University Bundang Hospital, Seoul National University College of Medicine, Seongnam, South Korea
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Jang BS, Jeon SH, Kim IH, Kim IA. Prediction of Pseudoprogression versus Progression using Machine Learning Algorithm in Glioblastoma. Sci Rep 2018; 8:12516. [PMID: 30131513 PMCID: PMC6104063 DOI: 10.1038/s41598-018-31007-2] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/16/2018] [Accepted: 08/09/2018] [Indexed: 01/22/2023] Open
Abstract
We aimed to investigate the feasibility of machine learning (ML) algorithm to distinguish pseudoprogression (PsPD) from progression (PD) in patients with glioblastoma (GBM). We recruited the patients diagnosed as primary GBM who received gross total resection (GTR) and concurrent chemoradiotherapy in two institutions from April 2010 to April 2017 and presented suspicious contrast-enhanced lesion on brain magnetic resonance imaging (MRI) during follow-up. Patients from two institutions were allocated to training (N = 59) and testing (N = 19) datasets, respectively. We developed a convolutional neural network combined with a long short-term memory ML structure. MRI data, which was 9 axial post-contrast T1-weighted images in our study, and clinical features were incorporated (Model 1). In the testing set, the trained Model 1 resulted in AUC of 0.83, AUPRC of 0.87, and F1-score of 0.74 using optimal threshold. The performance was superior to that of Model 2 (CNN-LSTM model with MRI data alone) and Model 3 (random forest model with clinical feature alone). The developed algorithm involving MRI data and clinical features could help making decision during follow-up of patients with GBM treated with GTR and concurrent CCRT.
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Affiliation(s)
- Bum-Sup Jang
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
| | - Il Han Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
- Institute of Radiation Medicine, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea
| | - In Ah Kim
- Department of Radiation Oncology, Seoul National University Bundang Hospital, Seongnamsi, Korea.
- Institute of Radiation Medicine, Cancer Research Institute, Seoul National University College of Medicine, Seoul, Korea.
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27
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Jeon SH, Kim JH. Positional uncertainties of cervical and upper thoracic spine in stereotactic body radiotherapy with thermoplastic mask immobilization. Radiat Oncol J 2018; 36:122-128. [PMID: 29983032 PMCID: PMC6074070 DOI: 10.3857/roj.2017.00591] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2017] [Accepted: 03/07/2018] [Indexed: 01/19/2023] Open
Abstract
Purpose To investigate positional uncertainty and its correlation with clinical parameters in spine stereotactic body radiotherapy (SBRT) using thermoplastic mask (TM) immobilization. Materials and Methods A total of 21 patients who underwent spine SBRT for cervical or upper thoracic spinal lesions were retrospectively analyzed. All patients were treated with image guidance using cone beam computed tomography (CBCT) and 4 degrees-of-freedom (DoF) positional correction. Initial, pre-treatment, and post-treatment CBCTs were analyzed. Setup error (SE), pre-treatment residual error (preRE), post-treatment residual error (postRE), intrafraction motion before treatment (IM1), and intrafraction motion during treatment (IM2) were determined from 6 DoF manual rigid registration. Results The three-dimensional (3D) magnitudes of translational uncertainties (mean ± 2 standard deviation) were 3.7±3.5 mm (SE), 0.9±0.9 mm (preRE), 1.2±1.5 mm (postRE), 1.4±2.4 mm (IM1), and 0.9±1.0 mm (IM2), and average angular differences were 1.1°±1.2° (SE), 0.9°±1.1° (preRE), 0.9°±1.1° (postRE), 0.6°±0.9° (IM1), and 0.5°±0.5° (IM2). The 3D magnitude of SE, preRE, postRE, IM1, and IM2 exceeded 2 mm in 18, 0, 3, 3, and 1 patients, respectively. No association were found between all positional uncertainties and body mass index, pain score, and treatment location (p > 0.05, Mann-Whitney test). There was a tendency of intrafraction motion to increase with overall treatment time; however, the correlation was not statistically significant (p > 0.05, Spearman rank correlation test). Conclusion In spine SBRT using TM immobilization, CBCT and 4 DoF alignment correction, a minimum residual translational uncertainty was 2 mm. Shortening overall treatment time and 6 DoF positional correction may further reduce positional uncertainties.
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Affiliation(s)
- Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
| | - Jin Ho Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Korea
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Chun SJ, Jeon SH, Chie EK. A Case Report of Salvage Radiotherapy for a Patient with Recurrent Gastric Cancer and Multiple Comorbidities Using Real-time MRI-guided Adaptive Treatment System. Cureus 2018; 10:e2471. [PMID: 29900091 PMCID: PMC5997429 DOI: 10.7759/cureus.2471] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022] Open
Abstract
The stomach is one of the most deforming organs caused by respiratory motions and daily variation by food intake. Applying radiotherapy has been quite a challenge due to the high risk of missing the target as well as radiation exposure to large volumes of normal tissue. However, real-time magnetic resonance (MR)-guided radiotherapy with adaptive planning could focus the high dose radiation to the target area while minimizing neighboring normal tissue exposure and compensate for not only daily but real-time variation. Here is a case report of a patient with recurrent gastric cancer and multiple co-morbidities, unsuitable for both resection and chemotherapy, who underwent MR guided adaptive radiotherapy.
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Affiliation(s)
- Seok-Joo Chun
- Department of Radiation Oncology, Seoul National University Hospital
| | - Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University Hospital
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University Hospital
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29
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Jeon SH, Park SH, Kim JW, Park CK, Paek SH, Kim IH. Efficacy of adjuvant radiotherapy in the intracranial hemangiopericytoma. J Neurooncol 2018; 137:567-573. [DOI: 10.1007/s11060-018-2746-3] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/07/2017] [Accepted: 01/05/2018] [Indexed: 01/10/2023]
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30
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Park JM, Shin KH, Kim JI, Park SY, Jeon SH, Choi N, Kim JH, Wu HG. Air–electron stream interactions during magnetic resonance IGRT. Strahlenther Onkol 2017; 194:50-59. [DOI: 10.1007/s00066-017-1212-z] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Accepted: 08/30/2017] [Indexed: 10/18/2022]
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31
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Jeon SH, Shin KH, Park SY, Kim JI, Park JM, Kim JH, Chie EK, Wu HG. Seroma change during magnetic resonance imaging-guided partial breast irradiation and its clinical implications. Radiat Oncol 2017. [PMID: 28633637 PMCID: PMC5477744 DOI: 10.1186/s13014-017-0843-7] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023] Open
Abstract
Background To investigate the patterns of post-lumpectomy seroma volume (SV) change and related clinical factors to determine the benefits of adaptive planning in magnetic resonance imaging (MRI)-guided partial breast irradiation (PBI). Methods MRI data obtained from 37 women with early breast cancer acquired at simulation and at the 1st, 6th, and 10th fractions were analyzed. The planning target volume (PTV) was defined as unequal margins of 10–15 mm added according to the directional surgical margin status of each seroma. Treatment was performed using a 0.35 T MRI-guided radiotherapy system. Univariate analysis was performed to assess the correlations between SV change rate and clinical factors. Seroma and PTV for adaptive planning were based on the images obtained at the 6th fraction. Results The average time intervals between surgery-simulation, simulation-1st, 1st-6th, and 6th-10th fractions were 23.1, 8.5, 7.2, and 5.9 days, respectively. Of the 37 patients, 33 exhibited decreased SV over the treatment period. The mean SV of these 33 patients decreased from 100% at simulation to 60, 48, and 40% at each MRI scan. In most cases (26/33), the logarithm of SV was inversely proportional to the elapsed time from surgery (R2 > 0.90, Pearson’s correlation test). The volume of spared normal tissue from adaptive radiotherapy was proportional to the absolute change in SV (R2 = 0.89, Pearson’s correlation test). Conclusion Seromas exhibit exponential shrinkage over the course of PBI. In patients receiving PBI, frequent monitoring of SV could be helpful in decision-making regarding adaptive planning, especially those with a large seroma.
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Affiliation(s)
- Seung Hyuck Jeon
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea
| | - Kyung Hwan Shin
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea. .,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea. .,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea. .,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea.
| | - So-Yeon Park
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Jung-In Kim
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Jong Min Park
- Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Jin Ho Kim
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Eui Kyu Chie
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
| | - Hong-Gyun Wu
- Department of Radiation Oncology, Seoul National University College of Medicine, Seoul, Republic of Korea.,Department of Radiation Oncology, Seoul National University Hospital, Seoul, Republic of Korea.,Biomedical Research Institute, Seoul National University Hospital, Seoul, Republic of Korea.,Institute of Radiation Medicine, Seoul National University Medical Research Center, Seoul, Republic of Korea
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Kim SA, Jeon SH, Kim NH, Kim HW, Lee NY, Cho TJ, Jung YM, Lee SH, Hwang IG, Rhee MS. Changes in the Microbial Composition of Microbrewed Beer during the Process in the Actual Manufacturing Line. J Food Prot 2015; 78:2233-9. [PMID: 26613919 DOI: 10.4315/0362-028x.jfp-15-261] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
This study investigated changes in the microbial composition of microbrewed beer during the manufacturing processes and identified potential microbial hazards, effective critical quality control points, and potential contamination routes. Comprehensive quantitative (aerobic plate count, lactic acid bacteria, fungi, acetic acid bacteria, coliforms, and Bacillus cereus) and qualitative (Escherichia coli and eight foodborne pathogens) microbiological analyses were performed using samples of raw materials (malt and manufacturing water), semiprocessed products (saccharified wort, boiled wort, and samples taken during the fermentation and maturation process), and the final product obtained from three plants. The initial aerobic plate count and lactic acid bacteria counts in malt were 5.2 and 4.3 log CFU/g, respectively. These counts were reduced to undetectable levels by boiling but were present at 2.9 and 0.9 log CFU/ml in the final product. Fungi were initially present at 3.6 log CFU/g, although again, the microbes were eliminated by boiling; however, the level in the final product was 4.6 log CFU/ml. No E. coli or foodborne pathogens (except B. cereus) were detected. B. cereus was detected at all stages, although it was not present in the water or boiled wort (total detection rate ¼ 16.4%). Results suggest that boiling of the wort is an effective microbial control measure, but careful management of raw materials and implementation of effective control measures after boiling are needed to prevent contamination of the product after the boiling step. The results of this study may constitute useful and comprehensive information regarding the microbiological quality of microbrewed beer.
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Affiliation(s)
- S A Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - S H Jeon
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - N H Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - H W Kim
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - N Y Lee
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - T J Cho
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - Y M Jung
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea
| | - S H Lee
- Nutrition Safety Policy Division, Ministry of Food and Drug Safety, 187 Osongsaengmyeong 2-ro, Osong-eup, Heungdeok-gu Cheongju-si, Chungcheongbuk-do 28159, Republic of Korea
| | - I G Hwang
- Food Safety Risk Assessment Division, National Institute of Food and Drug Safety Evaluation, 187 Osongsaengmyeong 2-ro, Osong-eup, Heungdeok-gu Cheongju-si, Chungcheongbuk-do 28159, Republic of Korea
| | - M S Rhee
- Department of Biotechnology, College of Life Sciences and Biotechnology, Korea University, Seoul 02841, Republic of Korea.
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Abstract
Minimal clinically important difference is the smallest difference in the score of an outcome instrument that patients perceive as important. A prospective observational study was conducted involving 66 consecutive patients undergoing limited open carpal tunnel release. Patients completed the Carpal Tunnel Questionnaire (CTQ) before surgery and 3 months post-surgery. A transition item for patient satisfaction after 3 months of surgery was used as an anchor. Receiver operator characteristic curves were used to determine the minimal clinically important differences for the CTQ and its two subscales that best separated satisfied and unsatisfied patients. A 0.92 point change in the CTQ, a 1.14 point change in the symptom subscale, and a 0.74 point change in the function subscale indicated a clinically relevant threshold of satisfaction, and those values were greater than what could be accounted for by measurement errors.
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Affiliation(s)
- J K Kim
- Department of Orthopedic Surgery, Ewha Womans University, School of Medicine, Seoul, South Korea.
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Kunkeaw N, Jeon SH, Lee K, Johnson BH, Tanasanvimon S, Javle M, Pairojkul C, Chamgramol Y, Wongfieng W, Gong B, Leelayuwat C, Lee YS. Cell death/proliferation roles for nc886, a non-coding RNA, in the protein kinase R pathway in cholangiocarcinoma. Oncogene 2012; 32:3722-31. [PMID: 22926522 DOI: 10.1038/onc.2012.382] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2012] [Revised: 07/09/2012] [Accepted: 07/23/2012] [Indexed: 12/25/2022]
Abstract
We have recently identified nc886 (pre-miR-886 or vtRNA2-1) as a novel type of non-coding RNA that inhibits activation of protein kinase R (PKR). PKR's pro-apoptotic role through eukaryotic initiation factor 2 α (eIF2α) phosphorylation is well established in the host defense against viral infection. Paradoxically, some cancer patients have elevated PKR activity; however, its cause and consequence are not understood. Initially, we evaluated the expression of nc886, PKR and eIF2α in non-malignant cholangiocyte and cholangiocarcinoma (CCA) cells. nc886 is repressed in CCA cells and this repression is the cause of PKR's activation therein. nc886 alone is necessary and sufficient for suppression of PKR via direct physical interaction. Consistently, artificial suppression of nc886 in cholangiocyte cells activates the canonical PKR/eIF2α cell death pathway, suggesting a potential significance of the nc886 suppression and the consequent PKR activation in eliminating pre-malignant cells during tumorigenesis. In comparison, active PKR in CCA cells does not induce phospho-eIF2α nor apoptosis, but promotes the pro-survival nuclear factor-κB pathway. Thus, PKR has a dual life or death role during tumorigenesis. Similarly to the CCA cell lines, nc886 tends to be decreased but PKR tends to be activated in our clinical samples from CCA patients. Collectively from our data, we propose a tumor surveillance model for nc886's role in the PKR pathway during tumorigenesis.
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Affiliation(s)
- N Kunkeaw
- Department of Biochemistry and Molecular Biology, The University of Texas Medical Branch, Galveston, TX 77555-1072, USA
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Choi JS, Hwang IR, Hong SH, Oh GT, Choi JA, Jeon SH, Kang SO, Yalishev VS, Park BH, Choi CH, Ahn CW, Nahm S, Ahn SJ. BaTiO3 doped Na0.5K0.5NbO3 thin films deposited by using eclipse shutter enhanced pulsed laser deposition method. J Nanosci Nanotechnol 2009; 9:7354-7358. [PMID: 19908787 DOI: 10.1166/jnn.2009.1759] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
We have investigated structural, electrical, and electro-mechanical properties of lead-free piezoelectric BaTiO3 doped Na0.5K0.5NbO3 (BTO-NKN) thin films deposited by pulsed laser deposition (PLD) methods. BTO-NKN thin films have been deposited on La0.5Sr0.5CoO3 (LSCO) bottom electrodes with LaAlO3 (LAO) substrates. X-ray diffraction data have shown that all the BTO-NKN and bottom electrodes are highly oriented with their c-axes normal to the substrates. In order to improve the morphology of BTO-NKN thin films, we have located an eclipse shutter between a target and a substrate. Root-mean-square roughness was changed from 91 nm to 21 nm with eclipse shutter enhanced PLD (E-PLD) method. Furthermore, the enhanced surface morphology leads to the improvement in electrical or electro-mechanical properties mainly due to increased density. Typical capacitance and d33 values of a BTO-NKN film deposited by E-PLD method are 1000 pF and 30 pmN, respectively.
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Affiliation(s)
- J S Choi
- Department of Physics, Konkuk University, Seoul 143-701, Korea
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Jeon SH, Park KH, Cho KH. Abstract: P1423 INHIBITION ABILITY OF FRUCTOSE MEDIATED APOLIPOPROTEIN A-I GLYCATION AND COPPER MEDIATED LDL OXIDATION BY CULINARY HERBS AND SPICES. ATHEROSCLEROSIS SUPP 2009. [DOI: 10.1016/s1567-5688(09)71431-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Moon JS, Koo HC, Joo YS, Jeon SH, Hur DS, Chung CI, Jo HS, Park YH. Application of a New Portable Microscopic Somatic Cell Counter with Disposable Plastic Chip for Milk Analysis. J Dairy Sci 2007; 90:2253-9. [PMID: 17430925 DOI: 10.3168/jds.2006-622] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
Abstract
The somatic cell count (SCC) is one of the international standards for monitoring milk quality, and it is a useful indicator of mastitis. The current reference method for determining the SCC in raw milk is direct microscopic analysis, but this method requires well-trained staff to maintain its accuracy and reproducibility. To overcome these inconveniences, we developed a portable system (the C-reader system) that utilizes the capillary flow of a microfluidic chamber by surface modification of the hydrophilicity. The microfluidic technology of disposable microchips allows for low consumption of reagents, and a combination of ready-to-use reagents makes the daily work easier. The repeatability test of the C-reader using 10 composite bovine milk samples satisfied the recommended values for SCC equipment. In addition, an acceptable accuracy level of the natural logarithmic-transformed SCC [ln(SCC/1,000): +/- 0.059 to 0.112] was achieved using composite raw milk samples and various somatic cell standard solutions from the American Eastern Laboratory and the Korean National Veterinary Research and Quarantine Service. After testing 875 composite milk samples, the C-reader showed a high correlation coefficient (R2 = 0.935 to 0.964) and a low mean difference value in log-transformed SCC (-0.088 to 0.004) compared with 3 automatic commercialized somatic cell counters (Fossomatic 4000, Somacount 150, and Somascope). In conclusion, the C-reader system is a new, easy-to-use automatic on-farm method with acceptable repeatability and accuracy for measuring SCC in large dairies and smaller laboratories.
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Affiliation(s)
- J S Moon
- Department of Bacteriology, National Veterinary Research and Quarantine Service, Anyang, Gyeonggi-do, Republic of Korea
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Jang J, Choi YI, Choi J, Lee KY, Chung H, Jeon SH, Seong RH. Notch1 confers thymocytes a resistance to GC-induced apoptosis through Deltex1 by blocking the recruitment of p300 to the SRG3 promoter. Cell Death Differ 2005; 13:1495-505. [PMID: 16341126 DOI: 10.1038/sj.cdd.4401827] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022] Open
Abstract
One notable phenotypic change during the differentiation of immature thymocytes into either mature CD4 or CD8 single-positive lineages is the acquisition of a resistance to glucocorticoid (GC)-induced apoptosis. We have previously reported that SRG3 is critical in determining the sensitivity for the GC-induced apoptosis in developing thymocytes. We report here that Notch signaling downregulates the transcriptional activation of SRG3 through N-box and/or E-box elements on its promoter. RBP-J represses SRG3 transcription through the N-box motif. On the other hand, Deltex1 competitively inhibits the binding of p300 to E2A/HEB protein bound to the E-box elements and represses the SRG3 promoter activity. Moreover, enforced expression of Deltex1 restored double-positive (DP) thymocyte survival from the GC-induced apoptosis. Our results suggest that Notch signaling confers differentiating DP thymocytes resistance to GCs by regulating the SRG3 expression through Deltex1, and that Deltex1 and SRG3 may play a significant role during DP thymocyte maturation.
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Affiliation(s)
- J Jang
- Department of Biological Sciences, Institute of Molecular Biology of Genetics, and Center for Functional Cellulomics, Seoul National University, Seoul 151-742, Korea
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Kim WH, Park H, Yun C, Cho H, Kim S, Paik WK, Jeon SH, Lee JH. Mixture of N-carbamoyl-L-glutamate plus L-arginine can protect rats with liver cirrhosis from acute ammonia intoxication. J Hepatol 2001; 35:719-25. [PMID: 11738098 DOI: 10.1016/s0168-8278(01)00199-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/04/2022]
Abstract
BACKGROUND/AIMS We earlier reported that N-carbamoyl-L-glutamate (CG) plus L-arginine (Arg) protected normal and 70% hepatectomized rats from intoxication by a lethal or sub-lethal dose of ammonium acetate, respectively. In the present study, the protective effect of these compounds on cirrhotic rats was assessed. METHODS CG plus Arg were administered prior to the injection of a sub-lethal dose of ammonium acetate into dimethylnitrosamine-induced cirrhotic rats. Control rats were given phosphate-buffered saline (PBS) instead of the mixture. The behavior of the rats was monitored until the time of sacrifice. Blood ammonia level, blood urea nitrogen (BUN) and liver carbamoylphosphate synthetase I (CPS I) activity were determined. RESULTS Pretreatment of rats with the mixture of CG plus Arg could significantly lower the blood ammonia level (P<0.05), increase the activity of CPS I (P<0.05), improve abnormal behavior associated with ammonia intoxication (P<0.05), and increase BUN (P<0.05), as compared with the PBS-injected control group. There were significantly close correlations between (1) the increase of CPS I activity; (2) the improvement of abnormal behavior; (3) the increase of BUN; and (4) the decrease of the blood ammonia level. CONCLUSIONS A mixture of CG plus Arg could protect rats with liver cirrhosis from acute ammonia intoxication.
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Affiliation(s)
- W H Kim
- Department of General Surgery, Ajou University School of Medicine, 442-749, Suwon, South Korea
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Chang SG, Jeon SH, Lee SJ, Choi JM, Kim YW. Clinical significance of urinary vascular endothelial growth factor and microvessel density in patients with renal cell carcinoma. Urology 2001; 58:904-8. [PMID: 11744455 DOI: 10.1016/s0090-4295(01)01375-9] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
OBJECTIVES To investigate the urinary vascular endothelial growth factor (VEGF) levels from patients with renal cell carcinoma (RCC). Neovascularization, an essential event for the growth of solid tumors, is regulated by a number of angiogenic factors. VEGF is thought to exert potent angiogenic activity. METHODS Urine samples were obtained before radical nephrectomy from 27 patients with RCC and 10 control subjects with no evidence of cancer or inflammatory disease. VEGF was measured by enzyme-linked immunosorbent assay in the urine and corrected according to the 24-hour urine concentration of creatinine. The microvessel density was measured by immunohistochemical staining with CD31 monoclonal antibody. Nuclear morphometry was performed by photomicroscopy. RESULTS The corrected urinary VEGF levels in patients with RCC were much higher than those in the normal control group (P = 0.039) and were more elevated in patients with higher stages of RCC (Stages III and IV versus Stages I and II; P = 0.024). A tendency was also noted for the VEGF levels to be higher according to cell grade. However, no statistical correlation was found between the corrected urinary VEGF and age, sex, tumor size, cell type, microvessel density, platelet count, or hemoglobin. The nuclear area was higher with more advanced-stage tumors (P = 0.043) and tended to increase according to the tumor cell grade. CONCLUSIONS The results of this study indicate that urinary VEGF levels are increased in patients with RCC. However, they may not reflect the underlying angiogenic activity, and it may be that other angiogenic factors play a more prominent role.
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Affiliation(s)
- S G Chang
- Department of Urology, Kyung Hee University School of Medicine, Seoul, South Korea
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Ree HI, Kim TE, Lee IY, Jeon SH, Hwang UW, Chang WH. Determination and geographical distribution of Orientia tsutsugamushi serotypes in Korea by nested polymerase chain reaction. Am J Trop Med Hyg 2001; 65:528-34. [PMID: 11716109 DOI: 10.4269/ajtmh.2001.65.528] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022] Open
Abstract
Field rodents and chigger mites were collected at 30 locations in Korea in October and November 1997-1999 to determine the serotypes of Orientia tsutsugamushi and their geographical distribution. A nested polymerase chain reaction was performed with the spleen tissues from 546 field-striped mice (Apodemus agrarius) and 104 pools of chigger mites. The positivity rate of O. tsutsugamushi was 45.6% in A. agrarius and 39.4% in the chigger mite pools. Two serotypes, Boryong and Karp, were found in these samples; the former was predominant (78.3% in the mice and 82.9% in the chigger mite pools), with wide distribution throughout the country, including Cheju-do. The latter was confined to the middle of the Korean peninsula, with positivity rates of 15.7% in the mice and 12.2% in the chigger mite pools. The double infection of Karp and Boryong serotypes was found in 15 (6.0%) A. agrarius mice. Gilliam serotype was not detected at any of the study locations. The Boryong and Kuroki serotypes were identical in amino acid sequence of the 56-kDa protein, although they differed in virulence to BALB/c mice.
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Affiliation(s)
- H I Ree
- Institute of Tropical Medicine, College of Medicine, Yonsei University, Seoul, Korea
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Abstract
Vascular endothelial growth factor (VEGF) is an important mediator of tumor angiogenesis and has been shown to be excreted in the urine of bladder cancer patient. The goal of this study was to evaluate urinary VEGF levels of patients with superficial bladder transitional cell carcinoma (TCC) and to determine its predictive value for recurrence. Pre-operative urinary VEGF levels were determined in 31 patients with superficial bladder TCC and 10 control patients. A quantitative enzyme immunoassay was used to measure urinary VEGF levels and the urine VEGF concentration was corrected by the creatinine concentration in a 24-h urine specimen. The corrected urinary VEGF levels were higher in patients than controls (p=0.003). Ten of 31 patients had TCC recurrences during this study. Corrected urinary VEGF levels were significantly higher in recurrent vs. non-recurrent patients (p=0.001). A cut-off value of 0.32 (corrected urinary VEGF levels) was valuable for predicting recurrences in this prospective study. However, there was no statistical correlation between VEGF levels and tumor stage (Ta or T1), tumor size or tumor grade. Pre-operative urinary VEGF levels are associated with a risk of recurrence in patient with superficial bladder TCC. Quantification of urinary VEGF may prove to be a valuable, non-invasive indicator of carcinoma recurrence in patients with superficial bladder TCC. Urinary VEGF may be a therapeutic target for intravesical therapy. However, because of the small number of cases, further studies with larger number of patients will be needed to clarify this issue.
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Affiliation(s)
- S H Jeon
- Department of Urology, School of Medicine, Kyung Hee University, Seoul, Korea
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Jeon SH, Park JW, Lee BH. Characterization of human IgE and mouse IgG1 responses to allergens in three mosquito species by immunoblotting and ELISA. Int Arch Allergy Immunol 2001; 126:206-12. [PMID: 11752877 DOI: 10.1159/000049515] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022] Open
Abstract
BACKGROUND IgE-mediated allergic reactions caused by mosquito bites are a common problem all over the world. This study was undertaken to determine IgE levels in subjects, to elucidate human IgE and mouse IgG1 binding patterns and to investigate the cross-reactivity of salivary gland antigens with three mosquitoes. METHODS Mosquito larvae of Aedes togoi, Culex tritaeniorhynchus and Culex pipiens pallens were collected and maintained in the laboratory. Salivary gland extracts (SGE) and whole-body extracts (WBE) were prepared from female mosquitoes of each species. Mosquito-specific IgE levels in 17 subjects were measured by ELISA. Polypeptide patterns were analyzed by SDS-PAGE. Immunoblotting was performed with sensitized human and immune mouse sera, and elucidated human IgE and mouse IgG1 binding patterns to SGE. For the determination of cross-reactivity to the three types of mosquitoes, ELISA inhibition tests were performed using sera from mice sensitized by biting of A. togoi. RESULTS The 9 sera out of 12 with positive skin reactions to SGE of A. togoi by skin prick test showed significantly higher anti-mosquito SGE IgE levels than in those without skin reactions. Protein band patterns of the SGE and WBE of the three species were different from one another. Specific human IgE reacted to the protein in SGE of 30.5, 33, 37 and 57.5 kD from A. togoi, of 38, 43 an 68 kD from C. tritaeniorhynchus, and of 23, 33, 34, 43, 44, 60, 74 and 93 kD from C. pipiens pallens. There were specific mouse IgG1 reactions to the bands of 30.5, 33, 37 and 57.5 kD in the SGE of A. togoi. The ELISA inhibition studies disclosed almost no cross-reactivities between A. togoi, C. tritaeniorhynchus and C. pipiens pallens. CONCLUSIONS Immunoblot analysis disclosed that allergenic proteins in the SGE of mosquitoes and their patterns were remarkably similar between human and mouse sera to the SGE of A. togoi. Species-shared allergens may not exist among the three mosquito species prevalent in Korea.
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Affiliation(s)
- S H Jeon
- Department of Biology, Korea University, Seoul 136-701, Korea
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Abstract
Cadmium has been associated with a number of tumors but its role in tumor promotion has not been elucidated clearly or the results obtained from various studies have been conflicting. This study was designed to investigate the effects of cadmium on the gap junctional intercellular communication (GJIC), number of gap junctions per cell, and cell proliferation in WB-F344 rat liver epithelial cells from the viewpoint of tumor promotion. GJIC was monitored by counting the cells stained with Lucifer yellow CH dye, using the scrape-loading and dye-transfer method. The numbers of gap junctions per cell were visually quantitated after an indirect immunostaining for gap junction protein using an antibody to connexin 43. Cell proliferation was assayed by direct counting of the living cells using the trypan blue dye exclusion method. In the time course study, cells treated with 200 microM CdCl2 showed rapid and nearly complete inhibition of GJIC (approximately 14% of the control) and a decrease in the number of gap junctions per cell (approximately 21% of the control) at 30 min, and the decrease continued up to 4 h without any changes in the cell viability. Treatment with CdCl2 (7.4-200 microM) for 4 h resulted in the decrease of GJIC and gap junction numbers per cell in a dose-response pattern without changes in the cell viability. In the long-term (14 days) exposure studies at doses of 0.01-7.4 microM CdCl2, an increase in cell proliferation was observed at low doses of 0.03-2.5 microM CdCl2, with GJIC also decreasing. These data demonstrate that cadmium inhibits GJIC, reduces the number of gap junctions per cell, and induces cell proliferation while decreasing the function of the gap junction.
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Affiliation(s)
- S H Jeon
- National Veterinary Research and Quarantine Service, Anyang, South Korea
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Sohn S, Kim HS, Jeon SH, Park SH. Intravascular ultrasound findings of coronary wall morphology in a child with Kawasaki disease. J Korean Med Sci 2001; 16:661-3. [PMID: 11641540 PMCID: PMC3057594 DOI: 10.3346/jkms.2001.16.5.661] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Intravascular ultrasound (IVUS) imaging was performed to assess the coronary wall morphology in detail at 22 months after the onset of Kawasaki disease in a girl who had developed coronary aneurysms at 4 yr of age. The sites of persistent aneurysms demonstrated a dilated lumen with a marked symmetrical or asymmetrical thickening of the intima-media complex. This pathologic finding was also present in angiographically normal vessels near an aneurysm but with a mild thickening. Coronary artery calcification was observed at one site in the aneurysms. The sites of normal coronary artery far from an aneurysm showed normal intravascular ultrasound findings with no measurable intima-media complex. Our case indicates that the healing process may continue via cell proliferation, with extension to the proximity of the coronary aneurysms. IVUS is useful to evaluate the coronary wall morphology and may be valuable in the long-term follow-up of coronary lesions due to Kawasaki disease.
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Affiliation(s)
- S Sohn
- Department of Pediatrics, Ewha Womans University College of Medicine and Ewha University Mokdong Hospital, Seoul, Korea.
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Lee S, Jeon SH, Kim BJ, Han SW, Jang HG, Kim SK. Classification of CD and absorption spectra in the Soret band of H(2)TMPyP bound to various synthetic polynucleotides. Biophys Chem 2001; 92:35-45. [PMID: 11527577 DOI: 10.1016/s0301-4622(01)00181-8] [Citation(s) in RCA: 65] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Abstract
The binding mode of porphyrins, namely meso-tetrakis(N-methyl pyridinium-4-yl)porphyrin (H(2)TMPyP), was classified in this work by absorption and circular dichroism(CD) spectroscopy. The three binding modes of intercalation, minor groove binding and external stacking exhibit their own characteristic absorption and CD spectra. Intercalation occurs for this porphyrin when bound to GC-rich polynucleotides at a low mixing ratio, as expected. This binding mode produces hypochromism and a red shift in the absorption band and a negative CD band in the Soret absorption region. When it is complexed with AT-rich polynucleotides at a low mixing ratio, hypochromism and a red shift in the absorption band and a positive CD peak is apparent, and this species can easily be assigned to the minor groove-binding mode. For both AT- and GC-rich polynucleotides at a high binding ratio, an excitonic CD was apparent. The sign of excitonic CD depends on the order of the DNA bases; the CD spectra of H(2)TMPyP complexed with non-alternating homopolymer (disregarding the nature of base pairs, i.e. AT or GC) are characterized by a positive band at short wavelengths followed by a negative band at long wavelengths. In contrast, those complexed with alternating polynucleotide were opposite to those of non-alternating homopolymers.
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Affiliation(s)
- S Lee
- Department of Chemistry, College of Science, Yeungnam University, Kyoungsan City, Kyoung-buk, 712-749, South Korea
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Choi YI, Jeon SH, Jang J, Han S, Kim JK, Chung H, Lee HW, Chung HY, Park SD, Seong RH. Notch1 confers a resistance to glucocorticoid-induced apoptosis on developing thymocytes by down-regulating SRG3 expression. Proc Natl Acad Sci U S A 2001; 98:10267-72. [PMID: 11504912 PMCID: PMC56950 DOI: 10.1073/pnas.181076198] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2001] [Indexed: 11/18/2022] Open
Abstract
We previously have reported that SRG3 is required for glucocorticoid (GC)-induced apoptosis in the S49.1 thymoma cell line. Activation of Notch1 was shown to induce GC resistance in thymocytes. However, the specific downstream target of Notch1 that confers GC resistance on thymocytes is currently unknown. We found that the expression level of SRG3 was critical in determining GC sensitivity in developing thymocytes. The expression of SRG3 also was down-regulated by the activated form of Notch1 (NotchIC). The promoter activity of the SRG3 gene also was down-regulated by NotchIC. Expression of transgenic SRG3 resulted in the restoration of GC sensitivity in thymocytes expressing transgenic Notch1. These results suggest that SRG3 is the downstream target of Notch1 in regulating GC sensitivity of thymocytes.
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Affiliation(s)
- Y I Choi
- Institute of Molecular Biology and Genetics and School of Biological Sciences, Seoul National University and International Vaccine Institute, Seoul 151-742, Korea
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Abstract
Long terminal repeat (LTR) elements of human endogenous retrovirus (HERV-K) may have contributed to disease-associated structural change or genetic variation in the human genome. The LTR elements have been found to be coexpressed with sequences of closely located genes. We identified seven HERV-K LTR elements from mRNA of human cancer cells (HepG2, MCF7, and SiHa), using the RT-PCR approach. Four of them are closely related to the human-specific HERV-K LTR elements with a high degree of sequence homology in a neighbor-joining phylogenetic tree. The data suggest that recently proliferated HERV-K LTR elements are expressed actively in various cancer cells. These HERV-K LTR elements deserve further investigation as potential leads in the treatment of human cancer.
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Affiliation(s)
- H S Kim
- Division of Biological Sciences, College of Natural Sciences, Pusan National University, Pusan 609-735, South Korea.
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Lee E, Jeon SH, Yi JY, Jin YJ, Son YS. Calcipotriol inhibits autocrine phosphorylation of EGF receptor in a calcium-dependent manner, a possible mechanism for its inhibition of cell proliferation and stimulation of cell differentiation. Biochem Biophys Res Commun 2001; 284:419-25. [PMID: 11394895 DOI: 10.1006/bbrc.2001.4943] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
We report in this study that proliferation inhibition of SCC13 cells by calcipotriol was possibly mediated by its inhibitory effect on autocrine activation of EGF receptor. Based on MTT assay, PCNA staining, DAPI staining, and involucrin immunocytochemical staining, we showed that calcipotriol inhibited cell growth and stimulated differentiation but did not induce apoptosis. Western blot analysis of concanavalin-A-bound fraction demonstrated that calcipotriol specifically dephosphorylated 170- and 66-kDa polypeptides from 8 h posttreatment and complete dephosphorylation was observed at 12 h posttreatment. The 170- and 66-kDa polypeptides were confirmed as EGF receptor and Shc, respectively. Calcipotriol-mediated EGF receptor dephosphorylation required the presence of extracellular calcium. Similar kinetics of the dephosphorylation was also observed in HaCaT cells cultured in medium of high calcium concentration. By BrdU labeling, we also showed calcium dependency of calcipotriol for the inhibition of cell proliferation. Therefore, EGF receptor deactivation by calcipotriol might be a mechanism of action for the inhibition of cell proliferation and the stimulation of differentiation in SCC13 cell and HaCaT cells.
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Affiliation(s)
- E Lee
- National Research Laboratory of Tissue Engineering, Korea Cancer Center Hospital, KAERI, 215-4, Gongneung-Dong, Nowon-Gu, Seoul, 139-706, Korea
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Kim SC, Jeon SH, Jung IR, Kim KH, Kwon MH, Kim JH, Yi JH, Kim SJ, You JC, Jung DH. Formation and emission status of PCDDs/PCDFs in municipal solid waste incinerators in Korea. Chemosphere 2001; 43:701-707. [PMID: 11372855 DOI: 10.1016/s0045-6535(00)00423-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
This study was carried out to examine the formation and the emission status of polychlorinated dibenzo-p-dioxins/polychlorinated dibenzofurans (PCDDs/PCDFs) in the flue gases of commercial-scale municipal solid waste (MSW) incinerators, and thus to provide the engineering data for the reduction of PCDDs/PCDFs emitted from MSW incinerators. The formation concentrations of the PCDDs/PCDFs generated at the outlet of waste heat boilers (WHB) were in the range of 1.18-29.61 ng-TEQ/N m3 (average 5.75 ng-TEQ/N m3), while the emission concentrations at the stacks were in the range of 0.026-4.548 ng-TEQ/N m3 (average 0.924 ng-TEQ/N m3). Two major 2,3,7,8-substituted congeners were 2,3,4,7,8-PeCDF and 2,3,4,6,7,8-HxCDF, and their concentrations were up to 50% and 64% of total TEQ values at the outlet of WHB and the stack, respectively. From the results of multi-regression analysis, the formation concentration of PCDDs/PCDFs could be predicted as follows with the correlation factor of r2 = 0.962: PCDDs/PCDFs (ng-TEQ/N m3) = 3.036 (Cl) + 0.094 (T1) - 0.472 (Combustibles) + 0.059 (CO) - 0.039 (THC) - 3.366 (H) + 22.157, where T1 (degrees C) is the temperature at the outlet of the WHB. Cl, Combustibles and H are given as percentages and the others are in parts per million.
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Affiliation(s)
- S C Kim
- NIER (National Institute of Environmental Research), Seo-Ku, Inchon, South Korea.
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