Journal
ENDOCRINE PATHOLOGY
Volume 30, Issue 3, Pages 237-245Publisher
HUMANA PRESS INC
DOI: 10.1007/s12022-019-9569-4
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Neuroendocrine neoplasms (NENs) have been primarily associated with germline pathogenic variants in genes involved in chromatin remodeling (MEN1), cell cycle control (CDKN1B), PI3K/mTOR signaling (TSC1/2, PTEN) as well as pseudohypoxia (VHL, SDHx). Recent work has implicated various genes involved in DNA repair pathways in the pathophysiology of a subset of pancreatic neuroendocrine neoplasms, including BRCA2, via the homologous recombination pathway (HRD). To date, germline variants in other HRD pathway genes have not been described to contribute to NEN. PALB2, RAD51C, and BARD1 are additional tumor suppressor genes which also mediate repair of double stranded DNA breaks through the HRD pathway and are implicated in hereditary breast (PALB2; BARD1) and ovarian (RAD51C) cancer. Here we report three cases of NEN associated with germline pathogenic variants in PALB2 (pancreatic NEN), RAD51C (thymic NEN), and BARD1 (pancreaticoduodenal NEN) respectively, further linking the DNA repair pathway to NENs.
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