More importantly, rare, deleterious germline variants were enriched in <i>Fanconi anemia</i> genes even without the <i>BRCA2</i> rs11571833 variant that is strongly enriched in lung SqCC cases (joint OR = 2.76; <i>P</i> = 7.0e-04; 95% CI, 1.6-4.7).
A rare truncating BRCA2 genetic variant, rs11571833 (K3326X), has been associated with a 2.5-fold risk of lung squamous cell carcinoma but only a modest 26% increase in breast cancer risk.