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Equal cancer-specific survival of positive CRMs and R1 resections. Kaplan–Meier survival curve of patients with positive resection margins (R1) of the control group (n = 21) and patients of the study group with positive CRM ≤1 mm (CRM+) (n = 51, 52%) and free CRM >1 mm (CRM−) (n = 47, 48%). There was no significant difference in survival between CRM+ and R1 (P = 0.12); significant differences were found between CRM− with CRM+ and R1 (both P < 0.001)
