CSNK2A1 and cholangiocarcinoma: Moreover, the GEPIA database shows that CSNK2A1 mRNA significantly increases in CCA compared with normal liver tissues (Supplemental Figure S8D, http://links.lww.com/HC9/A357), and the mRNA of CSNK2A1 and MAX are positively correlated with each other (Supplemental Figure S8E, http://links.lww.com/HC9/A357).