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Landmark analysis for hazard ratio for disease-specific survival (DSS) by peri-operative irinotecan or oxaliplatin (iri/oxal) therapy. Post-resection chemotherapy was truncated at 6 months and all patients with follow-up time less than 6 months were excluded form this landmark analysis. The total length of iri/oxal chemotherapy was recalculated as the sum of the pre-resection chemotherapy and truncated post-resection chemotherapy. P= 0.27
