Abstract 5800: Germline pathogenic variant of cancer predisposition genes in pancreatic cancer patients

Purpose: Genetic attribution for pancreatic cancer has been reported as 2-10%. However, the incidence of genetic predisposition and germline pathogenic variants (PVs) in Korean pancreatic cancer patients has not been well investigated. Therefore we studied to identify the clinical characteristics of the causative gene mutations and incidence of PV for future treatment strategies in pancreatic cancer. Methods: Total of 283 (145 male and 138 female) patients were enrolled in National Cancer Center in Korea (IRB no. NCC2019-0034, NCC2021-0338) and their median age was 67 years (range: 33-90). Resectable (25.1%), borderline resectable or locally advanced (25.5%), and metastatic (46.3%) stages were included. Germline hereditary cancer panel tests with 28 genes and BRCA1/2 gene were done in 97.2% (n=275) and 2.8% (n=8) of patients, respectively. Results: PVs were detected in 17 patients (median age 64, range 49-80) in ATM (n=5, 29.4%), BRCA1 (n=3, 17.6%), BRCA2 (n=2, 11.8%), RAD51D (n=2, 11.8%), TP53 (n=1, 5.9%), PALB2 (n=1, 5.9%), PMS2 (n=1, 5.9%), RAD50 (n=1, 5.9%), and SPINK1 (n=1, 5.9%). Eight patients (4 ATM PVs, 2 BRCA1 1 BRCA2, 1 PALB2 PV) presented various type of cancers in their families and three patients with ATM PVs showed pancreatic cancer in their first degree relatives. Nine patients without family cancer history represented median age as 66 (49-80) which was not significantly different of those with family history as 63 (51-75). Conclusions: This study showed 6.0% of incidence of germline PVs in Korean pancreatic cancer patients. Though we still don’t have guidelines for germline predisposition gene test in pancreatic cancer patients in Korea, this result showed that the incidence of PVs were comparable with that of the country which have recommendation to do genetic tests for all pancreatic cancer patients. To expand our knowledge for the incidence and involving genes of cancer predisposition for Korean pancreatic cancer patients, further analysis in larger number of patients is needed. (This study was supported by National cancer center, Korea, Grant no. 2110181).Keywords: Germ-line Mutation; Pancreatic Neoplasms; Incidence Citation Format: Yena Kim, Min Kyeong Kim, Kum Hei Ryu, Hyoeun Shim, Ji Sun Han, Jung Won Chun, Yun-Hee Kim, Ju Sun Song, Young-gon Kim, Sang Myung Woo, Sun-Young Kong. Germline pathogenic variant of cancer predisposition genes in pancreatic cancer patients [abstract]. In: Proceedings of the American Association for Cancer