Fig. 2
From: Prognostic impact of lymph node and surgical margin in patients with perihilar cholangiocarcinoma
a Overall survival curve for all enrolled patients. b Overall survival curve of negative lymph node (N0) and positive lymph node (N1) patients. c Overall survival curve of negative surgical margin (R0) and positive surgical margin (R1) patients. d Overall survival curve of patients with negative lymph node and negative surgical margin (N0R0), negative lymph node and positive surgical margin (N0R1), positive lymph node and negative surgical margin (N1R0), positive lymph node and positive surgical margin (N1R1)