A review of the literature revealed that the phosphatases responsible for TET1 phosphorylation are primarily classified into the PKC family and the serine–threonine protein kinase ATM family.[17] Consequently, staurosporine (PKCi), which belongs to the PKC‐inhibiting family, and AZD0156 (ATMi), which belongs to the ATM‐inhibiting family, were co‐incubated with cholangiocarcinoma cells. This evidence concerns the gene ATM and cholangiocarcinoma.