HNF4A and gastric cancer: Data in the Oncomine database revealed that mRNA expression and DNA copy number variation of HNF4A were significantly higher in GC tissues than in normal tissues in TCGA Gastric, Deng Gastric, Cho Gastric, and DErrico Gastric (P < 0.01), especially for intestinal type adenocarcinomas (P < 0.01) (Supplementary Figure S1).