CDKN1A and brain neoplasm: In an attempt to search for mutations in the GABRA6, GABRA1, GABRB2 genes, as well as the antioxidative gene NRF2, cysteine transporters (such as SLC7A11 and CD44v), and their regulators (such as JDP2 and p21Cip1 (CDKN1A) in brain tumors, the cBioPortal (http://www.cbioportal.org/faq#how-do-i-cite-the-cbioportal) data were accessed.