To verify the PPM1H expression level of different cancer types, we analyzed breast cancer (BRCA), cholangiocarcinoma (CHOL), lung adenocarcinoma (LUAD), and liver cancer (LIHC) disclosed in The Cancer Genome Atlas (TCGA: https://www.cancer.gov/ccg/research/genome-sequencing/tcga) and Gene Expression Profiling Interactive Analysis (GEPIA: http://gepia.cancer-pku.cn/).37 This evidence concerns the gene PPM1H and cholangiocarcinoma.