Abstract
This study was performed to analyze the impact of protein expression related to fluoropyrimidine and cisplatin metabolism (thymidylate synthase, dihydropyrimidine dehydrogenase, thymidine phosphorylase, orotate phosphoribosyltransferase [OPRT], excision repair cross-complementation 1, Fanconi anemia complementation group D2, glutathione S-transferase P1, and X-ray repair cross-complementing group 1) on treatment outcomes in patients with metastatic or relapsed gastric cancer (MRGC) receiving S-1/cisplatin chemotherapy. Protein expression was measured by immunohistochemistry (IHC). Of the 43 patients who had received S-1 (80 mg/m2/day; days 1–14) and cisplatin (60 mg/m2; day 1) every 3 weeks and had available tissue blocks, IHC was successfully performed in 41 patients. Patients with high OPRT levels in tumor tissues (IHC score ≥6) had superior progression-free survival (PFS) (23.3 vs. 14.1 weeks [median]) and overall survival (OS) (72.4 vs. 55.4 weeks [median]) to those with low OPRT levels (IHC score ≤5; P-values <.05). Expression levels of other proteins were not predictive of treatment outcomes. In multivariate analysis, both a good performance status and a high OPRT level were independently associated with prolonged PFS and OS. The OPRT expression level may be a good predictive marker in S-1/cisplatin-treated patients with MRGC.
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This study was partially supported by grants from Korean Cancer Research Foundation, Seoul National University Bundang Hospital Research Fund (11-2008-034), and Seoul Municipal Boramae Hospital Clinical Research Fund.
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The authors In Sil Choi and Hye Seung Lee contributed equally to this work.
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Choi, I.S., Lee, H.S., Lee, KW. et al. Biomarker analysis in patients with advanced gastric cancer treated with S-1 plus cisplatin chemotherapy: orotate phosphoribosyltransferase expression is associated with treatment outcomes. Med Oncol 28, 991–998 (2011). https://doi.org/10.1007/s12032-010-9590-4
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DOI: https://doi.org/10.1007/s12032-010-9590-4