BRCA2 and lung cancer: Results showed that the RR of BRCA2 is 0.76 (95% CI, 0.48–1.19), the overall RR is 0.96 (95% CI, 0.66–1.40), and that of BRCA1 is 0.66 (95% CI, 0.41–1.05), indicating that it was not associated with lung cancer.