BRCA1 and gastric cancer: Most recently, in a 2020 study using data from The Cancer Genome Atlas (TCGA) and a Chinese academic center, the proportional incidence of GC among male BRCA1/2 PV carriers with tumors (n = 294) was higher than that among non-BRCA1/2 carrying males with tumors (n = 4577) (11.9% vs. 5.5%, p < 0.001) in a subgroup analysis of the TCGA population [21].