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Objective  To compare the efficacy of adjuvant chemotherapy with six or eight cycles of S-1 plus oxaliplatin (SOX) or Capecitabine plus oxaliplatin (XELOX) after D2 resection of GC.    Design and participants  We collected 470 cases of patients with TNM stage II and III GC who underwent D2 gastrectomy in the Harbin Medical University Cancer Hospital from January 2007 to December 2017 and received six or eight cycles of SOX or XELOX regimen. This study was designed to evaluate the prognosis of patients receiving six or eight cycles of SOX or XELOX chemotherapy and identify the appropriate number of chemotherapy cycles.    Results  Among the 470 study participants [340 (72.3%) males; median age, 50 years (range, 24-76 years)], 355 and 115 received XELOX or SOX regimen chemotherapy, respectively. The number of 152 patients included in this study who received 6 and 8 cycles of chemotherapy in stage II and stage III without considering chemotherapy regimens were 125 and 27. The median DFS was, respectively, 14.9 months and 26.8 months (P = 0.08), the median OS was, respectively, 30.2 months and 30.8 months (P = 0.5), the difference was not statistically significant. Comprehensive survival analysis of XELOX and SOX group showed no significant difference for DFS (P = 0.29) and OS (P = 0.61). The total number of stage III GC patients who received six and eight cycles of chemotherapy was 92 and 19, respectively. The median DFS of patients who received six and eight cycles of chemotherapy was 14.6 and 23.2 months (P = 0.3), respectively. The median OS of patients who received six and eight cycles of chemotherapy was 26 and 30.6 months (P = 0.9), respectively. Comprehensive analysis of DFS (P=0.73) and OS (P=0.6) shows no difference between the XELOX group SOX groups. Subgroup analysis revealed significant differences in the gender (P = 0.05) and histological classification (P < 0.05) distribution.    Conclusion  Regardless of the XELOX regimen or the SOX regimen, similar survival benefits are observed in patients receiving six or eight chemotherapy cycles irrespective of the regimen used. The XELOX and SOX regimens are well tolerated in patients undergoing D2 resection of GC.

frontiers in oncology

Comparison of the Efficacy of S-1 Plus Oxaliplatin or Capecitabine Plus Oxaliplatin for Six and Eight Chemotherapy Cycles as Adjuvant Chemotherapy in Patients With Stage II-III Gastric Cancer After D2 Resection