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Nam JY, Lee JW, Kim JH, Jung M, Park MI, Moon W, Kim SE, Jung K, Park SJ. Direct gastric invasion from the liver metastasis of colorectal origin: A case report. Medicine (Baltimore) 2024; 103:e37732. [PMID: 38608071 PMCID: PMC11018212 DOI: 10.1097/md.0000000000037732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/23/2023] [Accepted: 03/06/2024] [Indexed: 04/14/2024] Open
Abstract
RATIONALE Colorectal cancer is the third most common cancer diagnosed worldwide. At the time of diagnosis of colorectal cancer, one of the most common metastatic sites is liver. Gastric metastasis from colorectal origin is rare. Moreover, a direct invasion of the stomach, by hepatic metastasis from colorectal cancer, is particularly uncommon. PATIENT CONCERNS A 56-year-old male patient with hematochezia was referred to our hospital. DIAGNOSIS The patient was diagnosed with unresectable colorectal cancer because of the presence of >10 metastases involving both lobes of the liver. INTERVENTIONS AND OUTCOMES After chemotherapy, the metastatic nodules in the liver nearly disappeared, except for a small nodule in segment VI. The patient underwent a radiofrequency ablation for the single lesion in the liver and laparoscopic low-anterior-resection for the primary tumor. Despite receiving various chemotherapy regimens, he experienced 6 recurrences, leading to 5 hepatectomies including a right hemi-hepatectomy, 1 pulmonary wedge resection, and 2 courses of radiation treatments. Lastly, a metastatic lesion in the liver was observed with invasion into the stomach. Subsequently, gastric wedge resection with resection of segments III and IV of the liver was performed. Direct invasion of the liver metastases into the stomach was confirmed histologically. LESSONS The patient is still alive, with a good quality of life, even after more than 8 years since the initial diagnosis. In the last instance of metastatic recurrence, direct invasion from the liver metastases into the stomach was observed, which is rare, and there are currently no reported cases.
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Affiliation(s)
- Jun Yeb Nam
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Jung Wook Lee
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Jae Hyun Kim
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Minjung Jung
- Department of Pathology, Kosin University College of Medicine, Busan, South Korea
| | - Moo In Park
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Won Moon
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Sung Eun Kim
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Kyoungwon Jung
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
| | - Seun Ja Park
- Department of Internal Medicine, Kosin University College of Medicine, Busan, Korea
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Chlorogiannis DD, Moussa AM, Zhao K, Alexander ES, Sofocleous CT, Sotirchos VS. Imaging Considerations before and after Liver-Directed Locoregional Treatments for Metastatic Colorectal Cancer. Diagnostics (Basel) 2024; 14:772. [PMID: 38611685 PMCID: PMC11011364 DOI: 10.3390/diagnostics14070772] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2024] [Revised: 03/28/2024] [Accepted: 04/02/2024] [Indexed: 04/14/2024] Open
Abstract
Colorectal cancer is a leading cause of cancer-related death. Liver metastases will develop in over one-third of patients with colorectal cancer and are a major cause of morbidity and mortality. Even though surgical resection has been considered the mainstay of treatment, only approximately 20% of the patients are surgical candidates. Liver-directed locoregional therapies such as thermal ablation, Yttrium-90 transarterial radioembolization, and stereotactic body radiation therapy are pivotal in managing colorectal liver metastatic disease. Comprehensive pre- and post-intervention imaging, encompassing both anatomic and metabolic assessments, is invaluable for precise treatment planning, staging, treatment response assessment, and the prompt identification of local or distant tumor progression. This review outlines the value of imaging for colorectal liver metastatic disease and offers insights into imaging follow-up after locoregional liver-directed therapy.
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Affiliation(s)
| | - Amgad M. Moussa
- Interventional Radiology Service, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Ken Zhao
- Interventional Radiology Service, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | - Erica S. Alexander
- Interventional Radiology Service, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
| | | | - Vlasios S. Sotirchos
- Interventional Radiology Service, Memorial Sloan Kettering Cancer Center, New York, NY 10065, USA
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Niitsu H, Mizumoto M, Li Y, Nakamura M, Ishida T, Iizumi T, Saito T, Numajiri H, Makishima H, Nakai K, Oshiro Y, Maruo K, Sakurai H. Tumor Response on Diagnostic Imaging after Proton Beam Therapy for Hepatocellular Carcinoma. Cancers (Basel) 2024; 16:357. [PMID: 38254846 PMCID: PMC10814092 DOI: 10.3390/cancers16020357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2023] [Revised: 01/10/2024] [Accepted: 01/12/2024] [Indexed: 01/24/2024] Open
Abstract
BACKGROUND Follow-up after treatment for hepatocellular carcinoma (HCC) can be mostly performed using dynamic CT or MRI, but there is no common evaluation method after radiation therapy. The purpose of this study is to examine factors involved in tumor reduction and local recurrence in patients with HCC treated with proton beam therapy (PBT) and to evaluate HCC shrinkage after PBT. METHODS Cases with only one irradiated lesion or those with two lesions irradiated simultaneously were included in this study. Pre- and post-treatment lesions were evaluated using Response Evaluation Criteria in Solid Tumors (RECIST) by measuring the largest diameter. RESULTS The 6-, 12-, and 24-month CR + PR rates after PBT were 33.1%, 57.5%, and 76.9%, respectively, and the reduction rates were 25.1% in the first 6 months, 23.3% at 6-12 months, and 14.5% at 13-24 months. Cases that reached CR/PR at 6 and 12 months had improved OS compared to non-CR/non-PR cases. CONCLUSIONS It is possible that a lesion that reached SD may subsequently transition to PR; it is reasonable to monitor progress with periodic imaging evaluations even after 1 year of treatment.
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Affiliation(s)
- Hikaru Niitsu
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Masashi Mizumoto
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Yinuo Li
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Masatoshi Nakamura
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Toshiki Ishida
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Takashi Iizumi
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Takashi Saito
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Haruko Numajiri
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Hirokazu Makishima
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Kei Nakai
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
| | - Yoshiko Oshiro
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
- Department of Radiation Oncology, Tsukuba Medical Center Hospital, Tsukuba 305-8558, Ibaraki, Japan
| | - Kazushi Maruo
- Department of Biostatistics, Institute of Medicine, University of Tsukuba, Tsukuba 305-8576, Ibaraki, Japan;
| | - Hideyuki Sakurai
- Proton Medical Research Center, Department of Radiation Oncology, University of Tsukuba Hospital, Tsukuba 305-8576, Ibaraki, Japan; (H.N.); (Y.L.); (M.N.); (T.I.); (T.I.); (T.S.); (H.N.); (H.M.); (K.N.); (Y.O.); (H.S.)
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Abualnil AY, Kumar R, George MA, Lalos A, Shah MM, Deek MP, Jabbour SK. Role of Stereotactic Body Radiation Therapy in Hepatocellular Carcinoma. Surg Oncol Clin N Am 2024; 33:173-195. [PMID: 37945142 DOI: 10.1016/j.soc.2023.06.012] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2023]
Abstract
Hepatocellular carcinoma (HCC)is a common type of liver cancer with a poor prognosis, especially in patients with advanced stages or underlying liver disease. While surgical resection, liver transplantation, and ablation therapies have traditionally been the mainstay of treatment for HCC, radiation therapy has become increasingly recognized as an effective alternative, particularly for those who are not surgical candidates. Stereotactic Body Radiation Therapy (SBRT) is a highly precise form of radiation therapy that delivers very high doses of radiation to the tumor while sparing surrounding healthy tissue. Several studies have reported favorable outcomes with SBRT in HCC treatment. Moreover, SBRT can be used to treat recurrent HCC after prior treatment, offering a potentially curative approach in select cases. While SBRT has demonstrated its efficacy and safety in treating HCC, future studies are needed to further investigate the potential role of SBRT in combination with other treatments for HCC.
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Affiliation(s)
- Aseel Y Abualnil
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA
| | - Ritesh Kumar
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA
| | - Mridula A George
- Department of Medical Oncology, Rutgers Cancer Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA
| | - Alexander Lalos
- Division of Gasteroenterology and Hepatology, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA
| | - Mihir M Shah
- Division of Surgical Oncology, Department of Surgery, Emory University School of Medicine, Atlanta, GA 30342, USA
| | - Matthew P Deek
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA
| | - Salma K Jabbour
- Department of Radiation Oncology, Rutgers Cancer Institute of New Jersey, Rutgers Robert Wood Johnson Medical School, Rutgers University, New Brunswick, NJ 08901, USA.
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Sharma HK, Kyriakakos C, Jabbour TE, Ward S, Buckstein M, Taouli B, Lewis S. Longitudinal assessment of hepatocellular carcinoma response to stereotactic body radiation using gadoxetate-enhanced MRI: A case series. Eur J Radiol 2023; 167:111077. [PMID: 37688918 DOI: 10.1016/j.ejrad.2023.111077] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2023] [Revised: 08/09/2023] [Accepted: 08/30/2023] [Indexed: 09/11/2023]
Abstract
PURPOSE To describe the longitudinal response in patients with hepatocellular carcinoma (HCC) treated with stereotactic body radiation therapy (SBRT) and who underwent liver transplant (LT) using gadoxetate-enhanced MRI. METHODS Five men (median age 61y, range 57-64y) with 6 HCCs treated with SBRT (median dose 50 Gy) who subsequently underwent LT were included in this retrospective study. Patients underwent gadoxetate-enhanced MRI before and after SBRT over a period of 3-18 months. Response was assessed using RECIST1.1, mRECIST, LI-RADS and image subtraction, by 2 observers in consensus. Percentage of pathologic tumor necrosis was evaluated. RESULTS LT was performed 278 days (IQR, 148-418d) after completion of SBRT and 48d after the last MRI. Histopathology demonstrated tumor necrosis of 48 ± 42% (range, 10-100%). Mean tumor size at baseline and last post-treatment MRIs pre-LT were 2.6 ± 0.8 cm and 2.4 ± 0.9 cm. Enhancing tumor component size at baseline MRI and last post-treatment MRI pre-LT were 1.6 ± 0.8 cm and 0.9 ± 1.0 cm. Responses assessed at the last LRI pre-LT were: partial response (PR, n = 3), stable disease (SD, n = 3) using RECIST1.1; complete response (CR, n = 2), partial response (PR, n = 2), stable disease (SD, n = 2) using mRECIST; and LR-TR viable (n = 4), LR-TR non-viable (n = 2) using LI-RADS. At the last MRI pre-LT, per-lesion features of arterial phase hyperenhancement (APHE, 4/6), portal venous washout (3/6) and capsule (3/6) were observed. 5/6 lesions displayed a hypointense perilesional halo on hepatobiliary phase with a mean delay of 3.1 months post-SBRT. CONCLUSIONS This case-series showed decreased size, persistent APHE, and incomplete pathologic necrosis in most HCCs treated with SBRT undergoing transplant.
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Affiliation(s)
- Himanshu Kumar Sharma
- Department of Diagnostic, Molecular and Interventional Radiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA
| | - Christopher Kyriakakos
- Department of Diagnostic, Molecular and Interventional Radiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA
| | - Tony El Jabbour
- Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, Annenberg Building, 15th Floor, 1468 Madison Avenue, New York, NY 10029, USA
| | - Stephen Ward
- Department of Pathology, Molecular and Cell-Based Medicine, Icahn School of Medicine at Mount Sinai, Annenberg Building, 15th Floor, 1468 Madison Avenue, New York, NY 10029, USA
| | - Michael Buckstein
- Department of Radiation Oncology, Icahn School of Medicine at Mount Sinai, 1184 5th Avenue, First Floor, New York, NY 10029, USA
| | - Bachir Taouli
- Department of Diagnostic, Molecular and Interventional Radiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA; BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA
| | - Sara Lewis
- Department of Diagnostic, Molecular and Interventional Radiology, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA; BioMedical Engineering and Imaging Institute, Icahn School of Medicine at Mount Sinai, One Gustave L. Levy Place, New York, NY 10029, USA.
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Patel R, Aslam A, Parikh ND, Mervak B, Mubarak E, Higgins L, Lala K, Conner JF, Khaykin V, Bashir M, Do RKG, Burke LMB, Smith EN, Kim CY, Shampain KL, Owen D, Mendiratta-Lala M. Updates on LI-RADS Treatment Response Criteria for Hepatocellular Carcinoma: Focusing on MRI. J Magn Reson Imaging 2023; 57:1641-1654. [PMID: 36872608 PMCID: PMC11078141 DOI: 10.1002/jmri.28659] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/16/2022] [Revised: 02/08/2023] [Accepted: 02/09/2023] [Indexed: 03/07/2023] Open
Abstract
As the incidence of hepatocellular carcinoma (HCC) and subsequent treatments with liver-directed therapies rise, the complexity of assessing lesion response has also increased. The Liver Imaging Reporting and Data Systems (LI-RADS) treatment response algorithm (LI-RADS TRA) was created to standardize the assessment of response after locoregional therapy (LRT) on contrast-enhanced CT or MRI. Originally created based on expert opinion, these guidelines are currently undergoing revision based on emerging evidence. While many studies support the use of LR-TRA for evaluation of HCC response after thermal ablation and intra-arterial embolic therapy, data suggest a need for refinements to improve assessment after radiation therapy. In this manuscript, we review expected MR imaging findings after different forms of LRT, clarify how to apply the current LI-RADS TRA by type of LRT, explore emerging literature on LI-RADS TRA, and highlight future updates to the algorithm. EVIDENCE LEVEL: 3. TECHNICAL EFFICACY: Stage 2.
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Affiliation(s)
- Richa Patel
- Department of Radiology, Stanford, California, USA
| | - Anum Aslam
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Neehar D Parikh
- Department of Internal Medicine, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Benjamin Mervak
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Eman Mubarak
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Lily Higgins
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Kayli Lala
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Jack F Conner
- Department of Radiology, University of Toledo Medical Center, Toledo, Ohio, USA
| | - Valerie Khaykin
- Department of Radiology and Hepatology, University of Michigan Medicine, Michigan, USA
| | - Mustafa Bashir
- Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Richard Kinh Gian Do
- Department of Radiology, Memorial Sloan Kettering Cancer Center, New York, New York, USA
| | - Lauren M B Burke
- Department of Radiology, University of North Carolina at Chapel Hill School of Medicine, Chapel Hill, North Carolina, USA
| | - Elainea N Smith
- Department of Radiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
| | - Charles Y Kim
- Department of Radiology, Duke University Medical Center, Durham, North Carolina, USA
| | - Kimberly L Shampain
- Department of Radiology, University of Michigan Medicine, Ann Arbor, Michigan, USA
| | - Dawn Owen
- Department of Radiation Oncology, Mayo Clinic Rochester, Rochester, Minnesota, USA
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Mai Z, Yang Q, Xu J, Xie H, Ban X, Xu G, Zhang R. Response evaluation of hepatocellular carcinoma treated with stereotactic body radiation therapy: magnetic resonance imaging findings. Abdom Radiol (NY) 2023; 48:1995-2007. [PMID: 36939911 PMCID: PMC10167191 DOI: 10.1007/s00261-023-03827-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2022] [Revised: 01/17/2023] [Accepted: 01/18/2023] [Indexed: 03/21/2023]
Abstract
PURPOSE To summarize the magnetic resonance imaging manifestations of hepatocellular carcinoma (HCC) with and without progression after stereotactic body radiation therapy (SBRT) and evaluate the treatment effect using the modified Liver Reporting and Data System (LI-RADS). METHODS Between January 2015 and December 2020, 102 patients with SBRT-treated HCC were included. Tumor size, signal intensity, and enhancement patterns at each follow-up period were analyzed. Three different patterns of enhancement: APHE and wash-out, non-enhancement, and delayed enhancement. For modified LI-RADS, delayed enhancement with no size increase were considered to be a "treatment-specific expected enhancement pattern" for LR-TR non-viable. RESULTS Patients were divided into two groups: without (n = 96) and with local progression (n = 6). Among patients without local progression, APHE and wash-out pattern demonstrated conversion to the delayed enhancement (71.9%) and non-enhancement (20.8%) patterns, with decreased signal intensity on T1WI(92.9%) and DWI(99%), increased signal intensity on T1WI (99%), and decreased size. The signal intensity and enhancement patterns stabilized after 6-9 months. Six cases with progression exhibited tumor growth, APHE and wash-out, and increased signal intensity on T2WI/DWI. Based on the modified LI-RADS criteria, 74% and 95% showed LR-TR-nonviable in 3 and 12 months post-SBRT, respectively. CONCLUSIONS After SBRT, the signal intensity and enhancement patterns of HCCs showed a temporal evolution. Tumor growth, APHE and wash-out, and increased signal intensity on T2WI/DWI indicates tumor progression. Modified LI-RADS criteria showed good performance in evaluating nonviable lesions after SBRT.
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Affiliation(s)
- Zhijun Mai
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Qiuxia Yang
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Jiahui Xu
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Hui Xie
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Xiaohua Ban
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Guixiao Xu
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China
| | - Rong Zhang
- Department of Radiology, Sun Yat-Sen University Cancer Center, No.651 Dongfeng Road East, Guangzhou, 510060, China.
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Navin PJ, Olson MC, Mendiratta-Lala M, Hallemeier CL, Torbenson MS, Venkatesh SK. Imaging Features in the Liver after Stereotactic Body Radiation Therapy. Radiographics 2022; 42:2131-2148. [PMID: 36240077 DOI: 10.1148/rg.220084] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Abstract
Historically, radiation therapy was not considered in treatment of liver tumors owing to the risk of radiation-induced liver disease. However, development of highly conformed radiation treatments such as stereotactic body radiation therapy (SBRT) has increased use of radiation therapy in the liver. SBRT is indicated in treatment of primary and metastatic liver tumors with outcomes comparable to those of other local therapies, especially in treatment of hepatocellular carcinoma. After SBRT, imaging features of the tumor and surrounding background hepatic parenchyma demonstrate a predictable pattern immediately after treatment and during follow-up. The goals of SBRT are to deliver a lethal radiation dose to the targeted liver tumor and to minimize radiation dose to normal liver parenchyma and other adjacent organs. Evaluation of tumor response after SBRT centers on changes in size and enhancement; however, these changes are often delayed secondary to the underlying physiologic effects of radiation. Knowledge of the underlying pathophysiologic mechanisms of SBRT should allow better understanding of the typical imaging features in detection of tumor response and avoid misinterpretation from common pitfalls and atypical imaging findings. Imaging features of radiation-induced change in the surrounding liver parenchyma are characterized by a focal liver reaction that can potentially be mistaken for no response or recurrence of tumor. Knowledge of the pattern and chronology of this phenomenon may allay any uncertainty in assessment of tumor response. Other pitfalls related to fiducial marker placement or combination therapies are important to recognize. The authors review the basic principles of SBRT and illustrate post-SBRT imaging features of treated liver tumors and adjacent liver parenchyma with a focus on avoiding pitfalls in imaging evaluation of response. Online supplemental material is available for this article. ©RSNA, 2022.
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Affiliation(s)
- Patrick J Navin
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
| | - Michael C Olson
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
| | - Mishal Mendiratta-Lala
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
| | - Christopher L Hallemeier
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
| | - Michael S Torbenson
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
| | - Sudhakar K Venkatesh
- From the Departments of Radiology (P.J.N., M.C.O., S.K.V.), Radiation Oncology (C.L.H.), and Pathology (M.S.T.), Mayo Clinic, 200 First St SW, Rochester, MN 55905; and Department of Radiology, University of Michigan, Ann Arbor, Mich (M.M.L.)
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Shampain KL, Hackett CE, Towfighi S, Aslam A, Masch WR, Harris AC, Chang SD, Khanna K, Mendiratta V, Gabr AM, Owen D, Mendiratta-Lala M. SBRT for HCC: Overview of technique and treatment response assessment. Abdom Radiol (NY) 2021; 46:3615-3624. [PMID: 33963419 DOI: 10.1007/s00261-021-03107-7] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2021] [Revised: 04/20/2021] [Accepted: 04/24/2021] [Indexed: 02/06/2023]
Abstract
Stereotactic body radiation therapy (SBRT) is an emerging locoregional treatment (LRT) modality used in the management of patients with hepatocellular carcinoma (HCC). The decision to treat HCC with LRT is evaluated in a multidisciplinary setting, and the specific LRT chosen depends on the treatment intent, such as bridge-to-transplant, down-staging to transplant, definitive/curative treatment, and/or palliation, as well as underlying patient clinical factors. Accurate assessment of treatment response is necessary in order to guide clinical management in these patients. Patients who undergo LRT need continuous imaging evaluation to assess treatment response and to evaluate for recurrence. Thus, an accurate understanding of expected post-SBRT imaging findings is critical to avoid misinterpreting normal post-treatment changes as local progression or viable tumor. SBRT-treated HCC demonstrates unique imaging findings that differ from HCC treated with other forms of LRT. In particular, SBRT-treated HCC can demonstrate persistent APHE and washout on short-term follow-up imaging. This brief review summarizes current evidence for the use of SBRT for HCC, including patient population, SBRT technique and procedure, tumor response assessment on contrast-enhanced cross-sectional imaging with expected findings, and pitfalls in treatment response evaluation.
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Affiliation(s)
| | | | - Sohrab Towfighi
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
| | - Anum Aslam
- Department of Radiology, University of Michigan, Ann Arbor, MI, USA
| | - William R Masch
- Department of Radiology, University of Michigan, Ann Arbor, MI, USA
| | - Alison C Harris
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
| | - Silvia D Chang
- Department of Radiology, University of British Columbia, Vancouver, BC, Canada
| | - Kanika Khanna
- Department of Hepatology, Henry Ford Hospital, Detroit, MI, USA
| | | | - Ahmed M Gabr
- Department of Radiology and Medical Imaging, University of Virginia, Charlottesville, VA, USA
| | - Dawn Owen
- Department of Radiation Oncology, Mayo Clinic Rochester, Rochester, MN, USA
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10
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In Regard to Kimura et al. Int J Radiat Oncol Biol Phys 2021; 110:615-616. [PMID: 33989584 DOI: 10.1016/j.ijrobp.2020.12.056] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Accepted: 12/28/2020] [Indexed: 12/25/2022]
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11
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Li Z, Jiao D, Han X. Commentary: Stereotactic Body Radiotherapy vs. Radiofrequency Ablation in the Treatment of Hepatocellular Carcinoma: A Meta-Analysis. Front Oncol 2021; 11:633417. [PMID: 34084741 PMCID: PMC8168374 DOI: 10.3389/fonc.2021.633417] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2020] [Accepted: 02/12/2021] [Indexed: 11/13/2022] Open
Affiliation(s)
- Zhaonan Li
- Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Dechao Jiao
- Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
| | - Xinwei Han
- Department of Interventional Radiology, The First Affiliated Hospital of Zhengzhou University, Zhengzhou, China
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12
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Sun XL, Jiang X, Kuang Y, Xing L, Bu LY, Yuan SH, Yu JM, Zheng SS. Potential of Gd-EOB-DTPA as an imaging biomarker for liver injury estimation after radiation therapy. Hepatobiliary Pancreat Dis Int 2019; 18:354-359. [PMID: 31221569 DOI: 10.1016/j.hbpd.2019.05.005] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/31/2019] [Accepted: 03/20/2019] [Indexed: 02/05/2023]
Abstract
BACKGROUND Hepatic radiation injury severely restricts irradiation treatment for liver carcinoma. The purpose of this study was to investigate the clinical application of gadolinium ethoxybenzyl diethylenetriamine pentaacetic acid (Gd-EOB-DTPA)-enhanced MRI (EOB-MRI) in the assessment of liver function after external radiation therapy and to determine the relationship between focal liver reaction (FLR) and liver function. METHODS A total of 47 patients with liver malignancies who underwent external beam radiation therapy were enrolled. EOB-MRI was performed on each patient at approximately one month post-radiotherapy. The hepatobiliary (HPB) phase images from EOB-MRI were fused with the planning CT images, and the isodose lines from the patients' treatment plans were overlaid onto the fused images. The correlation of the EOB-MR image intensity distribution with the isodose lines was studied. We also compared liver function in patients between pre-treatment and post-treatment. RESULTS Decreased uptake of Gd-EOB-DTPA, which was manifested by well-demarcated focal hypointensity of the liver parenchyma or FLR to high-dose radiation, was observed in the irradiated areas of 38 patients. The radiotherapy isodose line of decreased uptake area of Gd-EOB-DTPA was 30-46 Gy. The median corresponding dose curve of FLR was 34.4 Gy. Nine patients showed the absence of decreased uptake area of Gd-EOB-DTPA in the irradiated areas. Compared to the 38 patients with the presence of decreased uptake area of Gd-EOB-DTPA, 9 patients with the absence of decreased uptake area of Gd-EOB-DTPA showed significant higher levels of total bile acid, total bilirubin, direct bilirubin and alpha-fetoprotein (P < 0.05). There were no significant differences in alanine transaminase, aspartate aminotransferase, gamma-glutamyl transpeptidase or albumin levels between the two groups (P > 0.05). CONCLUSIONS Visible uptake of Gd-EOB-DTPA by the liver parenchyma was significantly associated with liver function parameters. EOB-MRI can be a valuable imaging biomarker for the assessment of liver parenchyma function outside of radiation area.
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Affiliation(s)
- Xiao-Li Sun
- Department of Radiation Oncology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Xue Jiang
- Department of Radiation Oncology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Yu Kuang
- Medical Physics Program, University of Nevada, Las Vegas, NV 89154, USA
| | - Lei Xing
- Department of Radiation Oncology, Stanford University School of Medicine, Stanford, CA 94305, USA
| | - Lu-Yi Bu
- Department of Radiation Oncology, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China
| | - Shuang-Hu Yuan
- Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Jin-Ming Yu
- Department of Radiation Oncology, Shandong Cancer Hospital Affiliated to Shandong University, Shandong Academy of Medical Sciences, Jinan 250117, China
| | - Shu-Sen Zheng
- Key Laboratory of Combined Multi-organ Transplantation, Ministry of Public Health, Department of Hepatobiliary and Pancreatic Surgery, The First Affiliated Hospital, Zhejiang University School of Medicine, Hangzhou 310003, China.
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13
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Mastrocostas K, Jang HJ, Fischer S, Dawson LA, Munoz-Schuffenegger P, Sapisochin G, Kim TK. Imaging post-stereotactic body radiation therapy responses for hepatocellular carcinoma: typical imaging patterns and pitfalls. Abdom Radiol (NY) 2019; 44:1795-1807. [PMID: 30710166 DOI: 10.1007/s00261-019-01901-y] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Stereotactic body radiation therapy (SBRT) has increased utility in the management of hepatocellular carcinoma (HCC) ranging from local therapy in early-stage HCC not suitable for other focal therapies to end-stage HCC. As the indications for the use of SBRT in HCC expand, diagnostic imaging is being increasingly used to assess response to treatment. The imaging features of tumor response do not parallel those of other focal therapies such as radiofrequency ablation or trans-arterial chemoembolization that immediately devascularize the tumor. The tumor response to SBRT on imaging takes much longer and often shows gradual changes including the reduction of enhancement and size over several months. It is essential to recognize the typical imaging patterns of response, as well as the appearance of focal liver reaction in the non-target liver that can confound image interpretation. The timing of treatment response assessment imaging is fundamental to minimize the potential for false negative response. The purpose of this article is to review the variable post-SBRT imaging features of HCC and adjacent liver parenchyma and discuss the potential pitfalls of imaging evaluation after SBRT for HCC.
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14
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Yoshida M, Ogino H, Iwata H, Hattori Y, Hashimoto S, Nakajima K, Sasaki S, Hara M, Sekido Y, Mizoe JE, Shibamoto Y. Transient increases in serum α fetoprotein and protein induced by vitamin K antagonist II levels following proton therapy does not necessarily indicate progression of hepatocellular carcinoma. Oncol Lett 2019; 17:3026-3034. [PMID: 30854081 DOI: 10.3892/ol.2019.9922] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2018] [Accepted: 12/31/2018] [Indexed: 12/19/2022] Open
Abstract
Transient increases in α-fetoprotein (AFP) and protein induced by vitamin K antagonist II (PIVKA-II), so-called flares, are frequently observed after treatment of hepatocellular carcinoma (HCC). In the present study, changes in AFP and PIVKA-II levels after proton therapy (PT), and the relationship between the flare phenomenon and clinical response were investigated. In 82 patients with stage I/II HCC (59 with no recurrence and 23 with out-of-field recurrence within 1 year), serum AFP and PIVKA-II levels were measured at 1, 3, 6, 9 and 12 months post-PT. AFP and PIVKA-II flares were defined as a >20% increase from the preceding serum level above 20 ng/ml (AFP) or 40 mAU/ml (PIVKA-II), followed by a >20% drop. Among the 59 patients with no recurrence, 3 (5.1%) had an AFP flare, while 23 (39%) had a PIVKA-II flare. The median time to AFP and PIVKA-II flare peaks was 1 and 6 months, respectively. In 4 patients, PIVKA-II flares were observed twice during follow-up. In 1 patient, AFP and PIVKA-II flares were observed simultaneously at 1 month post-PT. The PIVKA-II level pre-PT was significantly higher in the PIVKA-II flare-positive group compared with that in the flare-negative group (P=0.015, odds ratio 4.3, 95% confidence interval, 1.3-14.0). In the 23 patients with out-of-field recurrence, the median increase rate of PIVKA-II (203%) was higher than that in the PIVKA-II-flare-positive group (111%, P=0.035) and the time to recurrence (median, 9 months) was longer than the time to peak AFP level (1 month) in the AFP-flare-positive group (P=0.033). There was no significant association between flares and clinical response. Increases in AFP and PIVKA-II levels following PT should be assessed with caution to avoid misinterpretation of therapeutic outcome.
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Affiliation(s)
- Maiko Yoshida
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan.,Division of Cancer Biology, Aichi Cancer Center Research Institute, Nagoya, Aichi 464-8681, Japan.,Department of Molecular and Cellular Oncology, Field of Cancer Pathology and Informatics, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466-8550, Japan
| | - Hiroyuki Ogino
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Hiromitsu Iwata
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Yukiko Hattori
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Shingo Hashimoto
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Koichiro Nakajima
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Shigeru Sasaki
- Department of Diagnostic Radiology, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Masaki Hara
- Department of Diagnostic Radiology, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan
| | - Yoshitaka Sekido
- Division of Cancer Biology, Aichi Cancer Center Research Institute, Nagoya, Aichi 464-8681, Japan.,Department of Molecular and Cellular Oncology, Field of Cancer Pathology and Informatics, Nagoya University Graduate School of Medicine, Nagoya, Aichi 466-8550, Japan
| | - Jun-Etsu Mizoe
- Department of Radiation Oncology, Nagoya Proton Therapy Center, Nagoya City West Medical Center, Nagoya, Aichi 462-8508, Japan.,Osaka Heavy Ion Therapy Center, Osaka 540-0008, Japan
| | - Yuta Shibamoto
- Department of Radiology, Nagoya City University Graduate School of Medical Sciences, Nagoya, Aichi 467-8601, Japan
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15
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Kellock T, Liang T, Harris A, Schellenberg D, Ma R, Ho S, Yap WW. Stereotactic body radiation therapy (SBRT) for hepatocellular carcinoma: imaging evaluation post treatment. Br J Radiol 2018; 91:20170118. [PMID: 29334232 DOI: 10.1259/bjr.20170118] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022] Open
Abstract
Surgical resection, when feasible, is the standard of care for hepatocellular carcinoma. However, many tumours are not resectable at the time of diagnosis. Recently, stereotactic body radiation therapy (SBRT) has emerged as a non-invasive local therapy for both non-resectable primary hepatic malignancies as well as hepatic metastases. Knowledge of the expected hepatic parenchymal appearance post treatment, as well as potential pitfalls and complications, is essential for accurate evaluation of treatment response. This pictorial review provides a fundamental description of the SBRT technique, outlines the expected cross-sectional imaging appearances of tumour response, and highlights potential pitfalls in interpretation. The expected liver parenchymal changes post-SBRT are also reviewed, along with some common radiation-induced complications.
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Affiliation(s)
- Trenton Kellock
- 1 Department of Radiology, University of British Columbia, Faculty of Medicine , Vancouver, BC , Canada
| | - Teresa Liang
- 1 Department of Radiology, University of British Columbia, Faculty of Medicine , Vancouver, BC , Canada
| | - Alison Harris
- 2 Department of Radiology, Vancouver General Hospital , Vancouver, BC , Canada
| | - Devin Schellenberg
- 3 Department of Radiation Oncology, BC Cancer Agency , Vancouver, BC , Canada
| | - Roy Ma
- 3 Department of Radiation Oncology, BC Cancer Agency , Vancouver, BC , Canada
| | - Stephen Ho
- 2 Department of Radiology, Vancouver General Hospital , Vancouver, BC , Canada
| | - Wan Wan Yap
- 4 Department of Radiology, BC Cancer Agency , Vancouver, BC , Canada
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16
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Application of stereotactic body radiation therapy to cancer liver metastasis. Cancer Lett 2016; 379:225-9. [PMID: 26704306 DOI: 10.1016/j.canlet.2015.10.029] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2015] [Revised: 10/24/2015] [Accepted: 10/27/2015] [Indexed: 12/29/2022]
Abstract
As an accurate external beam irradiation method, stereotactic body radiotherapy (SBRT) has been increasingly used to deliver high dose in less fractions. The liver is one of the most common organs for cancer metastasis. Recently, there have been several trials applying SBRT to cancer liver metastasis and have proved to be effective and safe with local control (LC) rates ranging from 70% to 100% within one or two years and 2-year overall survival (OS) rates ranging from 30% to 38%. Many published studies indicate that SBRT for cancer liver metastasis results in good outcomes without severe toxicities. However, the validated contribution of SBRT to an improved progression-free survival is still missing and more randomized trials should be conducted.
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17
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Lock M, Malayeri AA, Mian OY, Mayr NA, Herman JM, Lo SS. Computed tomography imaging assessment of postexternal beam radiation changes of the liver. Future Oncol 2016; 12:2729-2739. [PMID: 27576360 DOI: 10.2217/fon-2016-0165] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023] Open
Abstract
Radiation is being used for patients with primary and secondary liver cancers, as a rapidly evolving treatment. However, postradiation imaging changes of the liver are not well understood and therefore challenging to interpret. Distinguishing normal radiation changes from residual or recurrent disease is difficult. Size and contrast enhancement have been used to guide interpretation and clinical recommendations, but normal radiation changes can make interpretation difficult and are not accounted for in available guidelines. Knowledge of dose- and time-dependent changes in addition to imaging findings, such as morphological and enhancement patterns, provides useful differentiating parameters. This paper reviews recent studies using computed tomography that can guide interpretation and help differentiate tumor from benign changes after external beam radiation.
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Affiliation(s)
- Michael Lock
- Department of Radiation Oncology, London Regional Cancer Program, University of Western Ontario, London, ON, Canada
| | - Ashkan A Malayeri
- Department of Radiology, National Institutes of Health, Bethesda, MD, USA
| | - Omar Y Mian
- Department of Radiation Oncology, Johns Hopkins University, Baltimore, MD, USA
| | - Nina A Mayr
- Department of Radiation Oncology, University of Washington School of Medicine, Seattle, WA, USA
| | - Joseph M Herman
- Department of Radiation Oncology, Johns Hopkins University, Baltimore, MD, USA
| | - Simon S Lo
- Department of Radiation Oncology, University of Washington School of Medicine, Seattle, WA, USA
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