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Mitchell OD, Gilliam K, del Gaudio D, McNeely KE, Smith S, Acevedo M, Gaduraju M, Hodge R, Ramsland ASS, Segal J, Das S, Hathaway F, Bryan DS, Tawde S, Galasinski S, Wang P, Tjota MY, Husain AN, Armato SG, Donington J, Ferguson MK, Turaga K, Churpek JE, Kindler HL, Drazer MW. Germline Variants Incidentally Detected via Tumor-Only Genomic Profiling of Patients With Mesothelioma. JAMA Netw Open 2023; 6:e2327351. [PMID: 37556141 PMCID: PMC10413174 DOI: 10.1001/jamanetworkopen.2023.27351] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 04/03/2023] [Accepted: 06/08/2023] [Indexed: 08/10/2023] Open
Abstract
IMPORTANCE Patients with mesothelioma often have next-generation sequencing (NGS) of their tumor performed; tumor-only NGS may incidentally identify germline pathogenic or likely pathogenic (P/LP) variants despite not being designed for this purpose. It is unknown how frequently patients with mesothelioma have germline P/LP variants incidentally detected via tumor-only NGS. OBJECTIVE To determine the prevalence of incidental germline P/LP variants detected via tumor-only NGS of mesothelioma. DESIGN, SETTING, AND PARTICIPANTS A series of 161 unrelated patients with mesothelioma from a high-volume mesothelioma program had tumor-only and germline NGS performed during April 2016 to October 2021. Follow-up ranged from 18 months to 7 years. Tumor and germline assays were compared to determine which P/LP variants identified via tumor-only NGS were of germline origin. Data were analyzed from January to March 2023. MAIN OUTCOMES AND MEASURES The proportion of patients with mesothelioma who had P/LP germline variants incidentally detected via tumor-only NGS. RESULTS Of 161 patients with mesothelioma, 105 were male (65%), the mean (SD) age was 64.7 (11.2) years, and 156 patients (97%) self-identified as non-Hispanic White. Most (126 patients [78%]) had at least 1 potentially incidental P/LP germline variant. The positive predictive value of a potentially incidental germline P/LP variant on tumor-only NGS was 20%. Overall, 26 patients (16%) carried a P/LP germline variant. Germline P/LP variants were identified in ATM, ATR, BAP1, CHEK2, DDX41, FANCM, HAX1, MRE11A, MSH6, MUTYH, NF1, SAMD9L, and TMEM127. CONCLUSIONS AND RELEVANCE In this case series of 161 patients with mesothelioma, 16% had confirmed germline P/LP variants. Given the implications of a hereditary cancer syndrome diagnosis for preventive care and familial counseling, clinical approaches for addressing incidental P/LP germline variants in tumor-only NGS are needed. Tumor-only sequencing should not replace dedicated germline testing. Universal germline testing is likely needed for patients with mesothelioma.
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Affiliation(s)
- Owen D. Mitchell
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Katie Gilliam
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | | | - Kelsey E. McNeely
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Shaili Smith
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Maria Acevedo
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Meghana Gaduraju
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Rachel Hodge
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | | | - Jeremy Segal
- Department of Pathology, The University of Chicago, Illinois
| | - Soma Das
- Department of Human Genetics, The University of Chicago, Illinois
| | - Feighanne Hathaway
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | | | - Sanjukta Tawde
- Department of Human Genetics, The University of Chicago, Illinois
| | | | - Peng Wang
- Department of Pathology, The University of Chicago, Illinois
| | | | - Aliya N. Husain
- Department of Pathology, The University of Chicago, Illinois
| | | | | | | | - Kiran Turaga
- Department of Surgery, The University of Chicago, Illinois
| | - Jane E. Churpek
- Division of Hematology, Medical Oncology, and Palliative Care, Department of Medicine, University of Wisconsin, Madison
| | - Hedy L. Kindler
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
| | - Michael W. Drazer
- Section of Hematology/Oncology, Department of Medicine, The University of Chicago, Illinois
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