Fig. 2From: HHLA2 in intrahepatic cholangiocarcinoma: an immune checkpoint with prognostic significance and wider expression compared with PD-L1Kaplan Meier survival curves for OS of patients with ICC according to HHLA2 and PD-L1 expression. High HHLA2 expression was significantly associated with poor overall survival (OS) in the training cohort (a) and the significance was validated in an independent validation cohort (b). PD-L1 expression on TC (c) and IC (d) both failed to stratify OS in the training cohort. The P-values were determined via log-rank testBack to article page