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Kaplan–Meier overall survival curves for patients stratified with LNR ≤ 0.056 and >0.056 groups according to the operation method with pancreaticoduodenectomy (A) and pylorus-preserving pancreaticoduodenectomy, PPPD (B), as well as the total number of lymph node resections ≤ 20 (C) and >20 groups (D). LNR = lymph node ratio; PPPD = pylorus-preserving pancreaticoduodenectomy
