CDKN2A and colorectal cancer: The common mutations are in genes including APC, TP53, KRAS and BRAF for colorectal cancer [reviewed in Testa et al. (40)], TP53 and p16/CDKN2A in oesophageal adenocarcinomas [reviewed in Testa et al. (41)], CDH1, PIK3CA, and RHOA in gastric cancers [reviewed in Ang et al. (42)], and KIT and PDGFRA with GIST [reviewed in Wozniak et al. (43)].