Mayo Clinic, Phoenix, Brazil
Pedro Luiz Serrano Uson Junior , Douglas Riegert-Johnson , Lisa A. Boardman , Mitesh J. Borad , Daniel H. Ahn , Mohamad Bassam Sonbol , Douglas O Faigel , Norio Fukami , Rahul Pannala , Katie Kunze , Michael A Golafshar , Edward D. Esplin , Robert Luke Nussbaum , Tanios S. Bekaii-Saab , Jewel Samadder
Background: Germline variations in cancer susceptibility genes have important implications on treatment and family counseling in pancreatic cancer (PC). We report the prevalence and clinical outcomes of unselected PC patients with pathogenic germline variants (PGV) detected using a universal testing approach. Methods: We undertook a prospective multi-site study of germline sequencing using an >80 gene next-generation sequencing platform among 250 PC patients (not selected for age or family cancer history) between April 1, 2018 and March 31, 2020. Demographic, tumor characteristics and clinical outcomes were compared between PGV carriers and non-carriers. Results: Of 250 patients, the mean age was 65 years (SD 8.7), 56% were male, 83.6% were white and 65.6% had advanced disease (Stage III and IV). PGV were found in 15.2% (N=38) of patients, two patients had more than one PGV. Variants of uncertain significance were found in 44.4% (N=111). Family history of cancer (OR 2.36, 95% CI: 1.14-5.19, p=0.025) was associated with a higher risk of PGV. In a median follow up of 16.5 months, median overall survival was 16.8 months in PGV carriers compared with 16.5 months in non-carriers (HR 0.51, 95 %CI, 0.25-1.01, p=0.05). Higher levels of CA 19-9 and advanced stages (III and IV) were associated with worse outcomes in both groups. Overall, 68% of PGV carriers had mutations in homologous recombination repair (HRR) genes, including BRCA1, BRCA2, PALB2, ATM, CHEK2, NBN, RAD51C. In 65% of HRR gene carrier’s systemic therapy with platinum was used. Conclusions: Universal multi-gene panel testing in pancreatic cancer reveals that 1 in 6 patients are carriers of PGV and is associated with improved survival. Multi-gene germline testing should be used to aid in treatment selection, prognostication, and familial cancer counseling. Distribution of the 40 PGV by penetrance status.
PGV | Total (n=40) | |
---|---|---|
High Penetrance | BRCA1 | 1 (2.5%) |
BRCA2 | 9 (22.5%) | |
CDKN2A | 1 (2.5%) | |
MSH6 | 1 (2.5%) | |
PALB2 | 2 (5.0%) | |
SDHA | 2 (5.0%) | |
TP53 | 1 (2.5%) | |
Moderate Penetrance | ATM | 7 (17.5%) |
CHEK2 | 4 (10.0%) | |
HOXB13 | 1 (2.5%) | |
NBN | 2 (5.0%) | |
RAD51C | 1 (2.5%) | |
Low Penetrance | APC (I1307K) | 1 (2.5%) |
MUTYH-monoallelic | 3 (7.5%) | |
Recessive | FH | 1 (2.5%) |
MSH3 | 1 (2.5%) | |
NTHL1 | 2 (5.0%) |
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