Novel Germline Mutation in BCAR1 in Two Siblings With Lung Cancer: a Possible Susceptibility Gene
Abstract Background: Lung cancer is the most prevalent malignancy worldwide. Most patients were sporadic and carried somatic mutations in hotspot genes. At present, accumulating researches had identified several germline mutations that predispose patients to lung cancer. In this report, two siblings were diagnosed as lung squamous cell carcinoma and lung adenocarcinoma, respectively. Results: The two siblings shared similar features of a germline insertion of 11 bp (GCCCTGGCATT) in BCAR1 producing a frameshift at codon 314 which is located at the substrate domain. The BCAR1 was previously demonstrated to be associated with lung cancer. The variant detected in this report would impair the regulation and functions of BRCA1 in some extent, thus may promote lung cancer tumorigenesis. Our findings suggest that BCAR1 is a possible susceptibility gene for lung cancer, and its functional analyses in lung cancer need further investigation.Conclusions: In this study, we first reported a novel causative mechanism of Lung cancer: an insertion of 11 bp in BCAR1 gene, which can be helpful in the genetic diagnosis of this disease.