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R. McMillan

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    MO09 - Mesothelioma I (ID 120)

    • Event: WCLC 2013
    • Type: Mini Oral Abstract Session
    • Track:
    • Presentations: 1
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      MO09.04 - Defining BAP1 Syndrome: Preliminary results from an epidemiologic ascertainment study (ID 3437)

      16:15 - 17:45  |  Author(s): R. McMillan

      • Abstract
      • Presentation
      • Slides

      Identifying tumorigenic mutations in malignant pleural mesothelioma (MPM) is essential to advance therapy. Somatic mutations in the BRCA-1 associated protein-1 (BAP1) gene occur in about 20% of MPM tumors (Bott et al., Nature Genetics, 2011). In a retrospective analysis evaluating demographics, exposures, and survival, a history of smoking was the only clinical feature associated with the presence of BAP1 mutations (Zauderer et al., in press, J Thorac Oncol, 2013). Germline BAP1 mutations have also been identified in families predisposed to MPM (Testa et al., Nature Genetics, 2011). BAP1 germline mutations have also been associated with other tumors including atypical Spitz nevi, uveal melanoma, and renal cell carcinoma. These discoveries suggest that BAP1 mutations in mesothelioma represent part of a new hereditary cancer syndrome but the exact clinical phenotype remains unclear. To establish the frequency of germline BAP1 mutations in MPM patients and to accurately assess exposure history and family histories in these patients, we have undertaken a clinical trial to prospectively collect this information from patients with MPM.

      All consenting patients provide a saliva or blood specimen from which germline DNA is extracted. Existing tumor samples are collected and analyzed for BAP1 mutation. Everyone completes a questionnaire regarding asbestos exposure, personal cancer history, and family history of malignancy. First, we will perform a de-identified assessment of the prevalence of germline BAP1 mutation. Patients whose tumors harbor BAP1 mutation and/or meet prespecified high risk criteria will be approached for identified germline testing after appropriate pre-test counseling. Mutations identified through research testing with be confirmed with clinical testing and additional genetic counseling will be undertaken. Testing will be offered to family members of patients with identified BAP1 germline mutations. Please see Figure 1 for study flow. Figure 1

      During the first 3 months that this protocol was open, we accrued 26 patients with mesothelioma, 15 of whom qualify for identified research testing. We will present results from ongoing testing at the meeting.

      Recruiting patients to perform both de-identified and identified germline testing is feasible. Given the paucity of information regarding penetrance and appropriate screening interventions, BAP1 germline testing should continue only in the context of research programs. Additional preclinical work is ongoing to exploit this potential therapeutic target. Supported, in part, by a grant from the Mesothelioma Applied Research Foundation.

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