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M. Lathrop



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    ORAL 40 - Biology 1 (ID 154)

    • Event: WCLC 2015
    • Type: Oral Session
    • Track: Thymoma, Mesothelioma and Other Thoracic Malignancies
    • Presentations: 1
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      ORAL40.02 - Molecular Landscape of Malignant Mesothelioma from Whole Exome Sequencing (ID 2439)

      16:56 - 17:07  |  Author(s): M. Lathrop

      • Abstract
      • Presentation
      • Slides

      Background:
      Whole exome sequencing has revealed key genetic events in several cancer types that have been successfully translated into clinical benefits. These advances are still lacking in malignant mesothelioma (MM), a highly aggressive malignancy with limited effective therapy. Frequent BAP1 mutations occur in a subset of this disease but the full molecular landscape of MM is still poorly characterized.

      Methods:
      We have therefore conducted whole exome sequencing of tumours from the pleura for 36 cases of MM. DNA from matched blood was available for 7 of the cases and was also sequenced. The variants were identified with GATK tools and annotated with ANNOVAR. Variants were filtered with the following criteria: quality score ≤ 50, present in dbSNP138, 1000 genomes variants and NHLBI ESP 6500 variants. Mutations with deleterious functional consequences predicted by Polyphen-2, SIFT and Mutation Taster tools were confirmed by Sanger sequencing.

      Results:
      A total of 9,064 variants (3,256 somatic) were identified. We confirmed mutations in genes previously described to be mutated in MM in 5 cases: BAP1 (R227C, Q684X, H141P), NF2 (76_76del, R221X) and TP53 (I195N). In BAP1 wt tumours (6 of the 7 cases with matched blood), we confirmed somatic mutations in 5 genes encoding components of either MAPK or WNT signaling pathways. In addition, we validated somatic mutations in 12 genes across 4 of the 6 cases, many of which are novel in MM and are involved in chromatin modification. We also observed these genes to be mutated in BAP1 wt tumours in the 29 additional unmatched MM cases.

      Conclusion:
      Thus our data suggests that in addition to BAP1, mutations in genes associated with MAPK, WNT signaling and the chromatin remodeling complex may represent a consistent pattern of molecular alterations in MM.

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