Notably, ALDH1A2 expression was significantly reduced in 17 TCGA tumor types, including bladder, breast, cervical, colon, esophageal, glioblastoma, head and neck, kidney, lung, prostate, rectum, stomach, thyroid, and endometrial cancers, when compared to adjacent normal tissues (data not shown). Here, ALDH1A2 is linked to glioblastoma.