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BACKGROUND Colorectal cancer (CRC) is considered to be a worldwide health problem because of its increasing incidence and prevalence. Surgery offers an opportunity for cure, but the postoperative recurrence rate is still high despite the advancement of chemotherapy. This study aimed to assess the efficacy and safety of prolonged capecitabine chemotherapy following CAPOX chemotherapy for stage III  CRC after radical surgery. MATERIAL AND METHODS This study included 212 patients with stage III CRC undergoing open radical surgery from July 2010 to June 2015. Among those patients, 104 patients received prolonged capecitabine chemotherapy (prolonged group) following 8 cycles of CAPOX regimen chemotherapy, while the other 108 patients (control group) received no prolonged chemotherapy. The prolonged chemotherapy consisted of capecitabine (1000 mg/m² per day for 2 weeks) and was repeated every 3 weeks for 8 cycles at most. Long-term survival and toxicities were retrospectively compared. RESULTS Patient characteristics did not differ between the 2 groups. For all patients, no significant difference was found in the 3-year disease-free survival (DFS) (P=0.7775) or 3-year overall survival (OS) rates between the 2 groups (P=0.5787). The prolonged group had significantly higher frequency of hand-foot syndrome (P=0.0267) and paresthesia (P=0.0164). In further subgroup analyses, no benefit for 3-year DFS or 3-year OS of prolonged capecitabine chemotherapy was found in colon cancer or rectal cancer. CONCLUSIONS Prolonged capecitabine chemotherapy following CAPOX regimen chemotherapy failed to improve the survival of patients with stage III CRC after radical surgery.

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Prolonged Capecitabine Chemotherapy Following Capecitabine and Oxaliplatin (CAPOX) Regimen Chemotherapy Failed to Improve Survival of Stage III Colorectal Cancer After Radical Resection