Germinal BRCA1-2 pathogenic variants (gBRCA1-2pv) and pancreatic cancer: epidemiology of an Italian patient cohort.

Objective: Germline BRCA1-2 pathogenic variants (gBRCApv) increase the risk of pancreatic cancer and predict for response to platinating agents and poly(ADP-ribose) polymerase inhibitors. Data on worldwide gBRCApv incidence among pancreatic ductal adenocarcinoma (PDAC) patients are sparse and describe a remarkable geographic heterogeneity. The aim of this study is to analyze the epidemiology of gBRCApv in Italian patients.
Materials and Methods: Patients of any age with pancreatic adenocarcinoma, screened within 3 months from diagnosis for gBRCApv in Italian oncologic centers systematically performing tests without any selection. For the purposes of our analysis, breast, ovarian, pancreas, and prostate cancer in a patient's family history was considered as potentially BRCA-associated. Patients or disease characteristics were examined using the χ ² test or Fisher's exact test for qualitative variables and the Student's t-test or Mann-Whitney test for continuous variables, as appropriate.
Results: Between June 2015 and May 2020, 939 patients were tested by 14 Italian centers; 492 (52%) males, median age 62 years (range 28-87), 569 (61%) metastatic, 273 (29%) with a family history of potentially BRCA-associated cancers. gBRCA1-2pv were found in 76 patients (8.1%; 9.1% in metastatic; 6.4% in non-metastatic). The gBRCA2/gBRCA1 ratio was 5.4 : 1. Patients with gBRCApv were younger compared with wild-type (59 versus 62 years, P = 0.01). The gBRCApv rate was 17.1% among patients <40 years old, 10.4% among patients 41-50 years old, 9.2% among patients 51-60 years old, 6.7% among patients aged 61-70 years, and 6.2% among patients >70 years old (none out of 94 patients >73 years old). gBRCApv frequency in 845 patients <74 years old was 9%. Patients with/without a family history of potentially BRCA-associated tumors had 14%/6% mutations.
Conclusion: Based on our findings of a gBRCApv incidence higher than expected in a real-life series of Italian patients with incident PDAC, we recommend screening all PDAC patients <74 years old, regardless of family history and stage, due to the therapeutic implications and cancer risk prevention in patients' relatives.
Competing Interests: Disclosure MR reports travel expenses and personal honoraria for Advisory Boards from Celgene, Merck, Astra-Zeneca, Baxalta (2016), Baxter, Sanofi (2017), Servier, Shire, Eli Lilly, Pfizer (2016), Novocure (2016), and Novartis (2016), personal honoraria for steering committee work for AstraZeneca, and non-remunerated steering committee activities for Boston Pharmaceuticals. MF reports travel expenses and personal honoraria for Advisory Boards from Celgene, Novartis, Advanced Accelerators Applications, and Ipsen. SC reports travel expenses and personal honoraria for the following companies. Speaker: Amgen, Bayer, Eli Lilly, Servier. Advisory Boards: Amgen, Eli Lilly, Bayer, Baxter, Merck Sharp & Dohme (MSD), Servier. Consultant: Amgen, Baxter, Eli Lilly, Celgene, Novartis, MSD. Research grant: Celgene, Eisai. GT: Travel expenses and personal honoraria for Advisory Boards from Celgene, Merck, Astra-Zeneca, Servier. LS reports travel expenses and personal honoraria for Advisory Boards from Merck-Serono, Celgene, Roche, Sanofi, Servier, Bayer, Astra-Zeneca, Amgen. DM reports research grants and personal fees for consulting from Incyte Corporation; research grants and personal fees for consulting from Shire, Evotec, and iOnctura; research grants from Celgene, and personal fees for consulting from Eli Lilly and Baxter. FDV reports travel expenses and personal honoraria for Advisory Boards: Roche, Amgen, Celgene, Eli Lilly, Servier. MDM reports travel expenses and personal honoraria for Advisory Boards from Celgene. GG reports travel expenses and personal honoraria for Advisory Boards from Celgene (2016–2017–2018), Sanofi (2016–2018), Servier (2019). FDB reports personal honoraria for: Consultant Advisory Board: Ignyta, Bristol-Myers Squibb (BMS), Daiichi Sankyo, Pfizer, Octimet Oncology, Incyte, Teofarma, Pierre Fabre, Roche, EMD Serono, Sanofi, NMS Nerviano Medical Science, Pharm Research Associated (UK) Ltd; Speaker: BMS, Roche, MSD, Ignyta, Bayer, ACCMED, Dephaforum S.r.l., Nadirex, Merck, Biotechspert Ltd, PriME Oncology, Pfizer, Servier, Celgene, Tesaro, Loxo Oncology Inc., Sanofi, Healthcare Research & Pharmacoepidemiology. MN reports travel expenses from Celgene and personal honoraria for Advisory Board from EMD Serono. All the other authors have declared no conflicts of interest. Patient consent Before testing, all patients signed an informed consensus statement that was revised and approved by a local ethics committee and allowed, for genetic testing, and data collection, and analysis and elaboration. Data were irreversibly anonymized before entering into the database. Data availability statement Data are available upon reasonable request.
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