In addition, the elevated A3G expression was found in multiple tumor tissues compared with normal tissues, such as cholangiocarcinoma (CHOL), esophageal carcinoma (ESCA), head and neck squamous cell carcinoma (HNSC), kidney renal clear cell carcinoma (KIRC), kidney renal papillary cell carcinoma (KIRP), and stomach adenocarcinoma (STAD). This evidence concerns the gene APOBEC3G and head and neck squamous cell carcinoma.