ALDH7A1 and lip and oral cavity carcinoma: Because approximately 10% (12.8%, 171 out of 1332) of the patients with oral cancer had ALDH7A1 allele mutation (rs13182402), one-tenth of the patients with the highest ALDH7A1 expression in the TCGA database were classified as the high-ALDH7A1 group, and the others were classified as the low-ALDH7A1 group.