CIAPIN1 and cholangiocarcinoma: The Cox proportional hazards model analysis was conducted to examine the effect of the covariates, including age, sex, invasion, lymph node metastasis, histology grading, and the tissue CIAPIN1 expression level, showing that only CIAPIN1 is an independent factor for poor prognosis of CCA (HR = 4.01, 95% CI: 1.131–14.195; p = 0.031, Table 2).