Through KM survival analysis, we further identified that high expression of P4HA2, P4HA1 and ABL2 with best cutoff value or median value were unfavorable in CC; however, CYP4F12 and GLTP were favorable prognostic factors for survival (Figure 3A and Supplementary Figure 1A). This evidence concerns the gene P4HA1 and cholangiocarcinoma.