APC and gastric cancer: Of the hotspot mutations we screened using OncoMap v4, the most commonly mutated oncogenes in gastric cancer were PIK3CA (n = 12, 5.1%), p53 (n = 11, 4.6%), APC (n = 6, 2.5%), STK11 (n = 5, 2.1%), CTNNB1 (n = 4, 1.7%), and CDKN2A (n = 2, 0.8%) (Table 3).