CSNK2A1 and cholangiocarcinoma: Available CCA data sets showed that CSNK2A1 mRNA levels are higher in iCCA compared with adjacent nontumor liver tissue (GSE76297) (Supplemental Figure S8F, http://links.lww.com/HC9/A357) and iCCA compared with normal human biliary epithelial cells (GSE32225) (Supplemental Figure S8G, http://links.lww.com/HC9/A357).