Fig. 5From: Prognostic impact of lymph node parameters in distal cholangiocarcinoma after pancreaticoduodenectomyThe X-tile software determined the optimal cutoff values of the lymph node metastasis number were 1 and 7 (a) and overall survival curves (b) for patients with lymph node dissection number of 1, 2 to 6, and ≥ 7Back to article page