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A, B Kaplan-Meier curves of OS (A, log-rank p = 0.027) and CSS (B, log-rank p = 0.036) comparing primary and secondary gastrectomy after PSM. C, D Kaplan-Meier curves of OS (A, log-rank p = 0.019) and CSS (B, log-rank p < 0.021) comparing secondary gastrectomy and chemotherapy after PSM
