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Kaplan–Meier analysis of disease‐free survival in patients who had successful adjuvant FOLFOX treatment. Disease‐free survival (DFS) in upfront surgery plus adjuvant chemotherapy and perioperative chemotherapy groups a before and b after weighting. FOLFOX, 5‐fluorouracil–leucovorin–oxaliplatin. a P = 0·170, b P = 0·476 (Cox model)
