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Itabashi T, Narita K, Ono A, Wada K, Tanaka T, Kumagai G, Yamauchi R, Nakane A, Ishibashi Y. Bactericidal and antimicrobial effects of pure titanium and titanium alloy treated with short-term, low-energy UV irradiation. Bone Joint Res 2017; 6:108-112. [PMID: 28246094 PMCID: PMC5331176 DOI: 10.1302/2046-3758.62.2000619] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/06/2016] [Accepted: 01/17/2017] [Indexed: 11/25/2022] Open
Abstract
Objectives The surface of pure titanium (Ti) shows decreased histocompatibility over time; this phenomenon is known as biological ageing. UV irradiation enables the reversal of biological ageing through photofunctionalisation, a physicochemical alteration of the titanium surface. Ti implants are sterilised by UV irradiation in dental surgery. However, orthopaedic biomaterials are usually composed of the alloy Ti6Al4V, for which the antibacterial effects of UV irradiation are unconfirmed. Here we evaluated the bactericidal and antimicrobial effects of treating Ti and Ti6Al4V with UV irradiation of a lower and briefer dose than previously reported, for applications in implant surgery. Materials and Methods Ti and Ti6Al4V disks were prepared. To evaluate the bactericidal effect of UV irradiation, Staphylococcus aureus 834 suspension was seeded onto the disks, which were then exposed to UV light for 15 minutes at a dose of 9 J/cm2. To evaluate the antimicrobial activity of UV irradiation, bacterial suspensions were seeded onto the disks 0, 0.5, one, six, 24 and 48 hours, and three and seven days after UV irradiation as described above. In both experiments, the bacteria were then harvested, cultured, and the number of colonies were counted. Results No colonies were observed when UV irradiation was performed after the bacteria were added to the disks. When the bacteria were seeded after UV irradiation, the amount of surviving bacteria on the Ti and Ti6Al4V disks decreased at 0 hours and then gradually increased. However, the antimicrobial activity was maintained for seven days after UV irradiation. Conclusion Antimicrobial activity was induced for seven days after UV irradiation on both types of disk. Irradiated Ti6Al4V and Ti had similar antimicrobial properties. Cite this article: T. Itabashi, K. Narita, A. Ono, K. Wada, T. Tanaka, G. Kumagai, R. Yamauchi, A. Nakane, Y. Ishibashi. Bactericidal and antimicrobial effects of pure titanium and titanium alloy treated with short-term, low-energy UV irradiation. Bone Joint Res 2017;6:108–112. DOI: 10.1302/2046-3758.62.2000619.
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Fabris D, Gramegna F, Cicerchia M, Marchi T, Barlini S, Piantelli S, Bini M, Bruno M, Casini G, Cinausero M, D’Agostino M, Degerlier M, Gelli N, Mantovani G, Morelli L, Mabiala J, Olmi A, Pasquali G, Poggi G, Valdré S, Vardaci E, Fotina O, Kravchuk V, Colonna M, Ono A. Pre-equilibrium emission to study clustering in nuclei. EPJ WEB OF CONFERENCES 2017. [DOI: 10.1051/epjconf/201716300016] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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Ono A, Tomono T, Ogihara T, Terada K, Sugano K. Investigation of biopharmaceutical drug properties suitable for orally disintegrating tablets. ADMET AND DMPK 2016. [DOI: 10.5599/admet.4.4.338] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
Abstract
<span style="color: black; font-family: 'Calibri','sans-serif'; font-size: 10pt; mso-fareast-font-family: 'Times New Roman'; mso-bidi-font-family: 'Times New Roman'; mso-ansi-language: EN-GB; mso-fareast-language: DE; mso-bidi-language: AR-SA;" lang="EN-GB">The purpose of this study was to evaluate the biopharmaceutical drug properties suitable for orally disintegrating tablets (ODTs). The net charge at pH 7.4, log D<sub>6.5</sub>, the highest dose strength, solubility in water, dose number, and elimination t<sub>1/2</sub> of 57 ODT drugs and 113 drugs of immediate-release (IR) formulations were compared. These drugs were classified according to the Biopharmaceutical Classification System (BCS). A lower dose strength and a longer elimination t<sub>1/2</sub> have been observed as characteristic properties of ODTs. The proportion of basic drugs was higher in the ODTs than in the IR. A significant difference was not observed between the ODT and the IR formulation for log D<sub>6.5</sub>, solubility in water, and dose number. The distributions of the ODT and IR formulations among each BCS class were similar, suggesting that an ODT can be developed regardless of the BCS class of a drug</span>.
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Kotake M, Murakami H, Naito T, Takahashi T, Kenmotsu H, Ono A, Wakuda K, Nakashima K, Omori S. 456P Practical use of osimertinib in Japanese patients with EGFR T790M mutation positive advanced non-small-cell lung cancer. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw594.020] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Murakami H, Omori S, Nakashima K, Wakuda K, Ono A, Kenmotsu H, Naito T, Takahashi T. 452P Disease progression site and subsequent therapy after progression during alectinib therapy. Ann Oncol 2016. [DOI: 10.1016/s0923-7534(21)00610-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022] Open
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Kotake M, Murakami H, Naito T, Takahashi T, Kenmotsu H, Ono A, Wakuda K, Nakashima K, Omori S. 456P Practical use of osimertinib in Japanese patients with EGFR T790M mutation positive advanced non-small-cell lung cancer. Ann Oncol 2016. [DOI: 10.1016/s0923-7534(21)00614-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022] Open
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Murakami H, Omori S, Nakashima K, Wakuda K, Ono A, Kenmotsu H, Naito T, Takahashi T. 452P Disease progression site and subsequent therapy after progression during alectinib therapy. Ann Oncol 2016. [DOI: 10.1093/annonc/mdw594.016] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Ono A, Serizawa M, Isaka M, Kojima H, Takahashi S, Nakashima K, Omori S, Wakuda K, Kenmotsu H, Naito T, Murakami H, Urakami K, Ohde Y, Nakajima T, Kusuhara M, Takahashi T, Yamaguchi K. An evaluation of the association between molecular signature and postoperative recurrence in patients with non-small cell lung cancer. Eur J Cancer 2016. [DOI: 10.1016/s0959-8049(16)32721-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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Sarti A, Lamon AW, Ono A, Foresti E. A new device to select carriers for biomass immobilization and application in an aerobic/anaerobic fixed-bed sequencing batch biofilm reactor for nitrogen removal. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2016; 74:2666-2674. [PMID: 27973371 DOI: 10.2166/wst.2016.410] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
This study proposes a new approach to selecting a biofilm carrier for immobilization using dissolved oxygen (DO) microsensors to measure the thickness of aerobic and anaerobic layers in biofilm. The biofilm carriers tested were polyurethane foam, mineral coal (MC), basaltic gravel, and low-density polyethylene. Development of layers in the biofilm carrier surface was evaluated using a flow cell device, and DO profiles were conducted to determine the size of the layers (aerobic and anaerobic). MC was the biofilm carrier selected due to allowing the development of larger aerobic and anaerobic layers in the biofilm (896 and 1,058 μm, respectively). This ability is supposed to improve simultaneous nitrogen removal by nitrification and denitrification biological processes. Thus, as a biofilm carrier, MC was used in a fixed-bed sequencing batch biofilm reactor (FB-SBBR) for treatment of wastewater with a high ammonia concentration (100-400 mgNH4+-N L-1). The FB-SBBR (15.0 L) was filled with matrices of the carrier and operated under alternating aeration and non-aeration periods of 6 h each. At a mean nitrogen loading rate of 0.55 ± 0.10 kgNH4+-N m-3 d-1, the reactor attained a mean nitrification efficiency of 95 ± 9% with nitrite as the main product (aerobic period). Mean denitrification efficiency during the anoxic period was 72 ± 13%.
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Ono A, Jinno H, Hirose A. Evaluation of the OECD QSAR toolbox in the screening of chemical sensitizer. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.07.546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ono A, Jinno H, Hirose A. Comparative analysis of respiratory and skin sensitization potential of chemicals using Japanese GHS classification. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.06.1538] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Hirose A, Kawamura T, Matsumoto M, Yamada T, Ono A, Ishii Watabe A. Toxicity evaluation of extractables and leachables from apparatus used in the single-use system for manufacturing biologics. Toxicol Lett 2016. [DOI: 10.1016/j.toxlet.2016.06.2099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Ishikawa K, Sakai T, Saito-Shono T, Miyawaki M, Osoegawa A, Sugio K, Ono A, Mori H, Nishida H, Yokoyama S, Okamoto O, Fujiwara S, Hatano Y. Pemetrexed-induced scleroderma-like conditions in the lower legs of a patient with non-small cell lung carcinoma. J Dermatol 2016; 43:1071-4. [PMID: 26992088 DOI: 10.1111/1346-8138.13354] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Accepted: 02/02/2016] [Indexed: 12/30/2022]
Abstract
Pemetrexed, which is used for the treatment of non-small cell lung carcinoma and malignant mesothelioma, induces cutaneous adverse reactions in approximately 20% of patients. There are also reports of the induction of fibrosing disorders. We describe a case of pemetrexed-induced scleroderma-like conditions in the lower legs of a patient whose pulmonary carcinoma has been relatively well controlled, with prolongation of the dose interval, in spite of the discomfort in both his legs. Skin biopsy revealed dermal fibrosis and dilated lymph vessels in the dermis, but lymphocytic infiltration around the lymph vessels, in contrast to the blood vessels, was minimal. Immunohistochemical staining revealed that the major subsets of T cells that had infiltrated around blood vessels were CD3 and CD45Ro, but no B cells were detected. High serum levels of interleukin (IL)-4 and IL-6 suggested that T cells, which secrete these cytokines, may be involved in the pathogenesis of this condition. Magnetic resonance imaging of the lower extremities revealed muscular and fascial involvement. Several chemotherapeutic agents, such as taxanes, gemcitabine and bleomycin, are known to induce scleroderma-like changes, and we should also keep the side-effects of pemetrexed in mind when we encounter patients with fibrosing conditions.
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Sugimoto K, Suzuki HI, Fujimura T, Ono A, Kaga N, Isobe Y, Sasaki M, Taka H, Miyazono K, Komatsu N. A clinically attainable dose of L-asparaginase targets glutamine addiction in lymphoid cell lines. Cancer Sci 2015; 106:1534-43. [PMID: 26331698 PMCID: PMC4714686 DOI: 10.1111/cas.12807] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2015] [Revised: 08/13/2015] [Accepted: 08/26/2015] [Indexed: 01/13/2023] Open
Abstract
L-asparaginase (L-ASNase) is an important branch of chemotherapy for acute lymphoblastic leukemia (ALL) and some types of non-Hodgkin's lymphoma, including natural killer (NK)-cell lymphoma. Although it mediates hydrolysis of asparagine (Asn) and glutamine (Gln), which are variably required for cancer cell survival, the relative contribution of Asn and Gln depletion to the anti-tumor activity in therapeutic doses is unclear in ALL and malignant lymphoma. Here we demonstrate that L-ASNase exerts cytotoxicity through targeting the Gln addiction phenotype in lymphoid cell lines. A clinically attainable intermediate dose of L-ASNase induced massive apoptosis in ALL Jurkat and mantle cell lymphoma Jeko cell lines, while a low dose of L-ASNase effectively killed NK-cell lymphoma cells. In the lymphoid cell lines Jurkat and Jeco, deprivation of Gln but not Asn specifically suppressed cell growth and survival, and phenocopied the action of L-ASNase. L-ASNase treatment and Gln deprivation dramatically disrupted the refilling of the tricarboxylic acid (TCA) cycle by intracellular glutamate (Glu) and disturbed the mitochondrial integrity, which were alleviated by various anaplerotic TCA cycle intermediates, suggesting a direct contribution of glutaminase activity of L-ASNase. The action of L-ASNase differs between Jurkat cells and NK-cell lymphoma cells, according to their dependence on Gln and Asn. Furthermore, we observed that high expression of glutaminase GLS1 is associated with increased sensivity to L-ASNase in pediatric B lineage ALL. Our results redefine L-ASNase as a therapeutic agent targeting Gln addiction in certain lymphoid cells and offer an additional basis for predicting L-ASNase sensitivity and engineering selective L-ASNase derivatives for leukemia and lymphoma.
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Hirose A, Hirata-Koizumi M, Kawamura T, Matsumoto M, Takahashi M, Nishimaki-Mogami T, Nishimura T, Ema M, Ono A. Derivation of subacute reference doses for drinking water quality management. Toxicol Lett 2015. [DOI: 10.1016/j.toxlet.2015.08.426] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Ono A, Matsumoto M, Takahashi M, Kawamura T, Hirata-Koizumi M, Hirose A. Is a 14-day dose setting study able to predict its 28-day repeated dose toxicity? Toxicol Lett 2015. [DOI: 10.1016/j.toxlet.2015.08.969] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Ono A, Murakami H, Wakuda K, Taira T, Kenmotsu H, Naito T, Ohde Y, Endo M, Nakajima T, Takahashi T. Dramatic response to ASP-3026 in patient with highly aggressive pulmonary inflammatory myofibroblastic tumor harboring ALK rearrangement. Ann Oncol 2015. [DOI: 10.1093/annonc/mdv095.1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Okada F, Sato H, Omeri AK, Ono A, Tokuyama K, Ando Y, Matsumoto A, Ogata M, Kohno K, Takano K, Mori H. Chest HRCT findings in acute transformation of adult T-cell lymphoma/leukemia. Eur Radiol 2015; 25:1607-13. [PMID: 25576228 DOI: 10.1007/s00330-014-3565-3] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2014] [Revised: 10/24/2014] [Accepted: 12/11/2014] [Indexed: 12/29/2022]
Abstract
OBJECTIVES To assess chest high-resolution computed tomography (HRCT) findings in patients with acute transformation of adult T cell leukaemia/lymphoma (ATLL). METHODS We retrospectively identified 72 consecutive patients at our institution with ATLL between October 2000 and March 2014. The cases included acute type (n = 20), lymphoma type (n = 21), smouldering type (n = 24) and chronic type (n = 7). Sixteen (7 men, 9 women; aged 36-85 years, mean 63.3 years) of 31 patients (24 with smouldering and seven with chronic type; 51.6 %) developed acute transformation of ATLL, and had undergone chest HRCT examinations. Parenchymal abnormalities, enlarged lymph nodes, pericardial effusion, pleural effusion and skin lesions were evaluated on HRCT. RESULTS Chest HRCT of 15 of the 16 patients showed abnormal findings, including ground-glass opacity (GGO) (n = 8), consolidation (n = 5), interlobular septal thickening (n = 5) and nodules (n = 5). Pleural effusion was found in five patients, lymph node enlargement in 10 patients and multiple skin thickening in two patients. CONCLUSIONS Almost all patients with acute transformation of ATLL had abnormal findings on chest HRCT, which consisted mainly of lymph node enlargement, GGO, interlobular septal thickening, nodules and bilateral pleural effusions. KEY POINTS • The recognition of CT findings of acute transformation is important • Almost all patients with acute transformation have abnormal findings on HRCT • Characteristic CT features are present in acute transformation of indolent ATLL.
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Hirai F, Yamanaka T, Taguchi K, Daga H, Ono A, Tanaka K, Kogure Y, Shimizu J, Kimura T, Fukuoka J, Iwamoto Y, Sasaki H, Takeda K, Seto T, Ichinose Y, Nakagawa K, Nakanishi Y. A multicenter phase II study of carboplatin and paclitaxel for advanced thymic carcinoma: WJOG4207L. Ann Oncol 2014; 26:363-8. [PMID: 25403584 DOI: 10.1093/annonc/mdu541] [Citation(s) in RCA: 70] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
Abstract
BACKGROUND Thymic carcinoma (TC) is an exceptionally rare tumor, which has a very poor prognosis differing from thymoma. Till date, there has been no report of any results of clinical trials focusing on TC. The role of non-anthracycline-based chemotherapy has not been elucidated since the previous studies included a relatively small number of TC patients. This single-arm study evaluated carboplatin and paclitaxel (CbP) in chemotherapy-naive patients with advanced TC. PATIENTS AND METHODS The study treatment consisted of carboplatin (area under the curve 6) and paclitaxel (200 mg/m(2)) every 3 weeks for a maximum of six cycles. The primary end point was objective response rate (ORR) by independent review. The secondary end points included overall survival (OS), progression-free survival (PFS), and safety. Based on the SWOG 2-stage design, the planned sample size of 40 patients was determined to reject the ORR of 20% under the expectation of 40% with a power of 0.85 and a type I error of 0.05. RESULTS Forty patients from 21 centers were enrolled for this study from May 2008 to November 2010. Of the 39 patients evaluable for analysis, 36 were pathologically diagnosed by independent review, and 97% patients were eventually TC. There was 1/13 complete/partial responses with an ORR of 36% (95% confidence interval 21%-53%; P = 0.031). The median PFS was 7.5 (6.2-12.3) months, while OS did not reach the median value. Major adverse event was grade 3-4 neutropenia in 34 patients (87%). There was no treatment-related death. CONCLUSIONS In this largest trial with TC, CbP showed promising efficacy in advanced TC when compared with anthracycline-based chemotherapy, which is the current standard treatment of thymic neoplasm. Our results established that CbP, one of the standard treatments for non-small-cell lung cancer, might be an option as a chemotherapy regimen for TC.
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Ono A, Sugano K. Application of the BCS biowaiver approach to assessing bioequivalence of orally disintegrating tablets with immediate release formulations. Eur J Pharm Sci 2014; 64:37-43. [DOI: 10.1016/j.ejps.2014.08.003] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2014] [Revised: 07/15/2014] [Accepted: 08/12/2014] [Indexed: 12/01/2022]
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Hisamatsu Y, Kenmotsu H, Akamatsu H, Serizawa M, Wakuda K, Imai H, Ono A, Taira T, Naito T, Murakami H, Endo M, Fukuda Y, Yamasaki K, Umehara R, Yamamoto N, Takahashi T, Koh Y. Plasma Epidermal Growth Factor Receptor Mutation Analyses in Japanese Advanced Non-Small-Cell Lung Cancer Patients Horboring Egfr Mutation By Rnase H-Dependent Pcr and Blocking Oligo Dependent Pcr Methods. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu326.77] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Yokota T, Tsushima T, Kenmotsu H, Watanabe J, Endo M, Hirashima Y, Takahashi T, Murakami H, Naito T, Taira T, Ono A, Wakuda K, Todaka A, Kunieda K, Jikoh T, Nakao Y, Shiga R, Yasui H. Phase I Clinical Trial of Ds-7423, an Oral Pi3K/Mtor Dual Inhibitor, in Japanese Patients with Advanced Solid Tumors. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu331.20] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Taira T, Kenmotsu H, Serizawa M, Wakuda K, Akamatsu H, Shukuya T, Ono A, Imai H, Naito T, Murakami H, Endo M, Nakajima T, Ohde Y, Yamamoto N, Koh Y, Takahashi T. Concurrent Genetic Alterations in Lung Cancer: a Comprehensive Genomic Profiling in a Japanese Cohort. Ann Oncol 2014. [DOI: 10.1093/annonc/mdu357.10] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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Ono A, Kenmotsu H, Watanabe M, Serizawa M, Mori K, Imai H, Taira T, Naito T, Murakami H, Nakajima T, Ohde Y, Endo M, Yamamoto N, Koh Y, Takahashi T. Mutant allele frequency predicts the efficacy of EGFR-TKIs in lung adenocarcinoma harboring the L858R mutation. Ann Oncol 2014; 25:1948-1953. [PMID: 25009007 DOI: 10.1093/annonc/mdu251] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
Abstract
BACKGROUND Whether the mutant allele frequency (MAF) may also have predictive implications for tyrosine kinase inhibitor (TKI) therapy in patients with advanced epidermal growth factor receptor (EGFR)-mutated lung adenocarcinoma (AELAd) remains unknown. PATIENTS AND METHODS Based on a biobanking system in conjunction with our institution, we assessed EGFR mutation status using pyrosequencing (Py) and by outsourcing laboratory tests, such as the Cycleave (Cy) and the Scorpion ARMS (A). RESULTS Out of 705 patients enrolled in the Shizuoka Lung Cancer Mutation Study between July 2011 and March 2013, 102 AELAd patients were identified as carrying the L858R mutation (L858Rm) using Py to analyze histological specimens. Of these 102 patients, the EGFR mutation status was assessed using both Py and Cy in 48 patients: the median MAF of L858R (MAFLR) was 18.5% (range: 8%-82%), and 45 patients (94%) were identified as having an L858Rm using both Py and Cy. Three patients (6%) with discrepant L858Rm findings were only identified using Py. The plotting of a receiver operating characteristic curve to identify the discordance in L858Rm findings showed that the area under the curve for MAFLR was 0.967 (95% confidence interval: 0.91-1) and that an MAFLR of 9% resulted in high sensitivity (100%) and specificity (99%). Also, 29 patients with AELAd, excluding those with postoperative recurrences, had their L858R status assessed using Cy or A. The median age, 69 years (range: 47-84 years); male/female, 14 (48%)/15 (52%); smokers/never-smokers 13 (45%)/16 (55%); ECOG PS 0-1/2-3, 26 (90%)/3 (10%); stage IIIB/IV, 4 (14%)/25 (86%); median MAFLR, 18% (range: 8%-63%). Patients with an MAFLR of ≤9% had a significantly shorter progression-free survival (PFS) period after TKI therapy than those with an MAFLR of >9% (mPFS: 92 versus 284 days, P = 0.0027). CONCLUSION The MAF may be a potential predictive factor of TKI treatment efficacy in patients with AELAd carrying the L858Rm.
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