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Malignant pleural mesothelioma (MPM) is a highly lethal cancer of the lining of the chest cavity. To expand our understanding of MPM, we conducted a comprehensive integrated genomic study, including the most detailed analysis of alterations to date. We identified histology-independent molecular prognostic subsets, and defined a novel genomic subtype with and mutations and extensive loss of heterozygosity. We also report strong expression of the immune-checkpoint gene in epithelioid MPM, strikingly higher than in other solid cancers, with implications for the immune response to MPM and for its immunotherapy. Our findings highlight new avenues for further investigation of MPM biology and novel therapeutic options. SIGNIFICANCE: Through a comprehensive integrated genomic study of 74 MPMs, we provide a deeper understanding of histology-independent determinants of aggressive behavior, define a novel genomic subtype with and mutations and extensive loss of heterozygosity, and discovered strong expression of the immune-checkpoint gene in epithelioid MPM...