CCNK and cholangiocarcinoma: Based on the TCGA and GTEx data from the public cancer portal, GEPIA2 [77], Cyclin K mRNA expression is increased in several types of cancers, including cholangiocarcinoma, esophageal carcinoma, glioblastoma, low-grade glioma, pancreatic adenocarcinoma, stomach adenocarcinoma, and thymoma (Figure 2A).