BRCA2 and colorectal cancer: To examine the relationship between BRCA2 and patient survival, we further selected the TCGA provisional gastric and colorectal tumor databases to perform survival rate analysis, and the results showed that the low levels of BRCA2 mRNA expression were significantly correlated with the poor survival rates of both gastric and colorectal cancer patients (gastric: p = 0.04, n = 354; colon: p = 0.04, n = 597; Figs. 1b and S1b).