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Kwon, H-C; Roh, MS; Oh, SY; Kim, S-H; Kim, MC; Kim, J-S; Kim, H-J
Annals of oncology, 03/2007, Volume: 18, Issue: 3Journal Article
Background: The aim of this study was to determine whether expressions of the excision repair cross-complementing (ERCC1), thymidylate synthase (TS), and glutathione S-transferase P1 (GSTP1) predict clinical outcome in patients with advanced gastric cancer treated with fluorouracil (5-fluorouracil)/oxaliplatin chemotherapy. Patients and methods: The study population consisted of 64 advanced gastric cancer patients (median age 51 years). Patients were treated with oxaliplatin 85 mg/m2 as a 2-h infusion at day 1 plus leucovorin 20 mg/m2 over 10 min, followed by 5-FU bolus 400 mg/m2 and 22-h continuous infusion of 600 mg/m2 at days 1–2. Treatment was repeated in 2-week intervals. The expressions of ERCC1, TS, and GSTP1 of primary tumors were examined by immunohistochemistry. Results: The positive rates of ERCC1, TS, and GSTP1 were 70.3%, 29.7%, and 50.0%, respectively. The patients without ERCC1 expression were more likely to respond to chemotherapy (P = 0.045). There were no significant differences between response and TS or GSTP1 expression pattern (P = 0.813, P = 0.305, respectively). Median overall survival (OS) was significantly longer in patients without ERCC1 expression (P = 0.0396). TS or GSTP1 expression were not related to survival (P = 0.4578, P = 0.8121, respectively). Multivariate analysis revealed that ERCC1 expression significantly impacted on OS (hazard ratio 1.92, P = 0.037). Conclusion: Immunohistochemical studies for ERCC1 may be useful in prediction of the clinical outcome in advanced gastric cancer patients treated with 5-FU and oxaliplatin.
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