MUC5AC and cholangiocarcinoma: In line with the literature, the Kaplan–Meier curves revealed a significant impact on OS in CCA patients for the expression of MUC4 (p < 0.001) or MUC5AC (p = 0.006) while there was no difference in the survival for MUC1 (p = 0.44), MUC2 (p = 0.3) and MUC6 (p = 0.983) in our study cohort [23].