Bap1 Tumor Predisposition Syndrome: Preliminary Data From A Laboratory-Based Multigene Panel Testing Cohort.

490Background: Germline mutations in BAP1 have recently been shown to cause a tumor predisposition syndrome characterized by renal cell carcinoma (RCC), uveal melanoma, cutaneous melanoma, and mesothelioma. However, mutations have thus far been identified in highly enriched cohorts and the tumor spectrum among individuals with a broader phenotype undergoing multi-gene panel testing (MGPT) has not been described. Other genes associated with familial RCC have been established, such as FLCN (Birt-Hogg Dube syndrome) and VHL (von Hippel Lindau), but the proportion of BAP1 mutations in individuals with RCC is not yet known. Here we aim to describe the clinical features of individuals with BAP1 mutations identified from a clinical laboratory cohort, and to estimate the frequency of BAP1 mutations in individuals with kidney cancer. Methods: Since May 2015, a total of 6956 tests have been ordered that include BAP1 at our diagnostic laboratory. Retrospective data review yielded molecular and clinical details for i...