Cumulative probability of recurrence (local or distant) after curative
intent resection for perihilar cholangiocarcinoma with number of patients at
risk. (A) All patients; (B) margin wide, narrow, or positive, p=0.002; (C) N0
(node-negative with at least 4 evaluated lymph nodes), Nx (node-negative with
less than 4 evaluated lymph nodes), vs N1 (node-positive), p<0.001; (D)
well versus moderately or poorly differentiated tumor, p<0.001.