Germline pathogenic variants among Mexican patients with adenocarcinoma of the pancreas.

Authors

null

Jose Luis Rodriguez Olivares

Olivares, Mexico City, Mexico

Jose Luis Rodriguez Olivares , Yanin Chavarri Guerra , Jazmin Arteaga , Hector De la Mora Molina , Andrés Rodríguez-Faure , Ana María Hernández , Danielle Castillo , Jeffrey N. Weitzel

Organizations

Olivares, Mexico City, Mexico, Instituto Nacional de Ciencias Medicas y Nutrición Salvador Zubirán, Mexico City, DF, Mexico, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Mexico City, Mexico, Instituto Nacional de Ciencias Medicas y Nutrición Salvador Zubiran, Ciudad De M Xico, Cdmx, Mexico, Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán, Delegacion Tlalpan, Mexico, Facultad de Medicina de la Universidad Autónoma de Coahuila, Torreón, Mexico, City of Hope Cancer Center, Duarte, CA, Oncogenetics for Precision Prevention, and Latin American School of Oncology, Sierra Madre, CA

Research Funding

No funding received

Background: The reported frequency of germline pathogenic variants (PVs) in patients with pancreatic cancer is 8-10%. Depending on the setting, pancreatic cancer-associated germline PVs in the BRCA and CDKN2A genes are the most commonly detected. The mismatch repair genes (MMR; Lynch syndrome), TP53, STK11, ATM and PALB2 are also associated with an increased risk of pancreatic cancer. The identification of PVs in patients with pancreatic cancer is important as there may be a benefit of targeted therapies, such as PARP inhibitors for cases with defective double strand break repair or response to immunotherapy with defective MMR and high tumor mutational burden. Additionally, identification of predisposing PVs can enable screening and prevention for other family members through cascade testing. According to international guidelines, all patients diagnosed with exocrine pancreatic cancer are candidates for genetic testing. However, there is an underrepresentation of ethnic/ racial minorities, including Hispanic patients, in genetic studies. Methods: Between April 2017 and May 2020, patients with diagnosis of pancreatic adenocarcinoma who were treated at the Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán and enrolled in the international Clinical Cancer Genomics Community Research Network registry were included in this analysis. Genetic testing was performed by full sequencing of the following genes: BRCA1, BRCA2, TP53, NF1, ATM, CHEK2, PALB2, CDKN2A, BRIP1, RAD50, RAD51C, RAD51D, MLH1, MSH2, MSH6, PMS2 and EPCAM, as well as multiplex ligation-dependent probe amplification for selected genes and BRCA1 ex9-12del (Mexican founder mutation) screening with a three-primer polymerase chain reaction. Pedigrees, clinical and demographic data were obtained from the clinical records. Results: Forty-two patients with a diagnosis of pancreatic adenocarcinoma were included, with a median age at diagnosis of 57 years (range, 43-79), and 23/42 (55%) were women. The proportion of cases with operable, unresectable and metastatic disease at diagnosis was similar (33.3% for each group). The frequency of PVs was 11.9% (ATM n =2, TP53 n =1, PALB2 n =1 and CHEK2 n =1). With a median follow-up 20 months 29/42 patients had died at the time of analysis (69%), the median overall survival was 16 months (range 3-84 months). No PVs were detected in the 4/42 patients who met the definition of familial pancreatic cancer (9.5%). Conclusions: Our results confirm the presence of PVs in cancer susceptibility genes in Mexican patients with pancreatic cancer, which is similar to that reported in other populations. However, it is notable that no BRCA PVs were identified in this small sample, as they are the most common PV found in other populations. Given to the heterogeneity of the PVs identified, our study supports the use of multi- gene panel testing in Hispanic patients with pancreatic cancer.

Disclaimer

This material on this page is ©2024 American Society of Clinical Oncology, all rights reserved. Licensing available upon request. For more information, please contact licensing@asco.org

Abstract Details

Meeting

2022 ASCO Gastrointestinal Cancers Symposium

Session Type

Poster Session

Session Title

Poster Session B: Cancers of the Pancreas, Small Bowel, and Hepatobiliary Tract

Track

Pancreatic Cancer,Hepatobiliary Cancer,Neuroendocrine/Carcinoid,Small Bowel Cancer

Sub Track

Prevention, Screening, and Hereditary Cancers

DOI

10.1200/JCO.2022.40.4_suppl.540

Abstract #

540

Poster Bd #

F9

Abstract Disclosures

Similar Abstracts

Abstract

2023 ASCO Annual Meeting

Spectrum of germline pathogenic variants among patients with cancer in Mexico.

First Author: Jose Luis Rodriguez Olivares

First Author: Nicole Casasanta

Abstract

2022 ASCO Gastrointestinal Cancers Symposium

Pathogenic variants among Mexican patients with colorectal cancer referred for genetic cancer risk assessment.

First Author: Jose Luis Rodriguez Olivares

First Author: Silvia Gasperoni