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Sini MC, Doro MG, Frogheri L, Zinellu A, Paliogiannis P, Porcu A, Scognamillo F, Delogu D, Santeufemia DA, Persico I, Palomba G, Maestrale GB, Cossu A, Palmieri G. Combination of mutations in genes controlling DNA repair and high mutational load plays a prognostic role in pancreatic ductal adenocarcinoma (PDAC): a retrospective real-life study in Sardinian population. J Transl Med 2024; 22:108. [PMID: 38280995 PMCID: PMC10821545 DOI: 10.1186/s12967-024-04923-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2023] [Accepted: 01/22/2024] [Indexed: 01/29/2024] Open
Abstract
BACKGROUND Patients with pancreatic ductal adenocarcinoma (PDCA) carrying impaired mismatch repair mechanisms seem to have an outcome advantage under treatment with conventional chemotherapy, whereas the role for the tumor mutation burden on prognosis is controversial. In this study, we evaluated the prognostic role of the mutated genes involved in genome damage repair in a real-life series of PDAC patients in a hospital-based manner from the main Institution deputed to surgically treat such a disease in North Sardinia. METHODS A cohort of fifty-five consecutive PDAC patients with potentially resectable/border line resectable PDAC (stage IIB-III) or oligometastatic disease (stage IV) and tumor tissue availability underwent next-generation sequencing (NGS)-based analysis using a panel containing driver oncogenes and tumor suppressor genes as well as genes controlling DNA repair mechanisms. RESULTS Genes involved in the both genome damage repair (DR) and DNA mismatch repair (MMR) were found mutated in 17 (31%) and 15 (27%) cases, respectively. One fourth of PDAC cases (14/55; 25.5%) carried tumors presenting a combination of mutations in repair genes (DR and MMR) and the highest mutation load rates (MLR-H). After correction for confounders (surgery, adjuvant therapy, stage T, and metastasis), multivariate Cox regression analysis indicated that mutations in DR genes (HR = 3.0126, 95% CI 1.0707 to 8.4764, p = 0.0367) and the MLR (HR = 1.0018, 95%CI 1.0005 to 1.0032, p = 0.009) were significantly related to worse survival. CONCLUSIONS The combination of mutated repair genes and MLR-H, which is associated with a worse survival in our series of PDAC patients treated with conventional chemotherapy protocols, might become a predictive biomarker of response to immunotherapy in addition to its prognostic role in predicting survival.
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Affiliation(s)
- Maria Cristina Sini
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Maria Grazia Doro
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Laura Frogheri
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Angelo Zinellu
- Department of Biomedical Sciences, University of Sassari, Sassari, Italy
| | - Panagiotis Paliogiannis
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Traversa La Crucca 3, 07100, Sassari, Italy
| | - Alberto Porcu
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Traversa La Crucca 3, 07100, Sassari, Italy
| | - Fabrizio Scognamillo
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Traversa La Crucca 3, 07100, Sassari, Italy
| | - Daniele Delogu
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Traversa La Crucca 3, 07100, Sassari, Italy
| | | | - Ivana Persico
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Grazia Palomba
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Giovanni Battista Maestrale
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy
| | - Antonio Cossu
- Department of Medicine, Surgery and Pharmacy, University of Sassari, Traversa La Crucca 3, 07100, Sassari, Italy
| | - Giuseppe Palmieri
- Unit of Cancer Genetics, Institute of Genetic Biomedical Research (IRGB), National Research Council (CNR), Sassari, Italy.
- Immuno-Oncology & Targeted Cancer Biotherapies, University of Sassari, Sassari, Italy.
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