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Molecular And Histopathological Characterization Of The Tumor Immune Microenvironment In Advanced Stage Of Malignant Pleural Mesothelioma

N. S. Patil, L. Righi, H. Koeppen, W. Zou, S. Izzo, F. Grosso, R. Libener, M. Loiacono, V. Monica, C. Buttigliero, S. Novello, P. Hegde, M. Papotti, M. Kowanetz, G. Scagliotti
Published 2018 · Medicine

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Introduction Malignant pleural mesothelioma (MPM) is a rare, highly aggressive, and relatively chemoresistant and radioresistant malignancy with limited therapeutic options. Our objective was to investigate the prevalence of programmed death ligand 1 (PD‐L1) and the characteristics of the immune environment in this disease. Methods A total of 99 archival tumors from advanced‐stage MPM were immunohistochemically tested in parallel for PD‐L1 in two different laboratories, and 87 of them were profiled for immune gene expression by NanoString analysis for 800 genes. A prior study on the same samples indicated a low mutational load with a complex mutational landscape of genetic variations more frequently associated with the p53/DNA repair and phosphoinisitide‐3‐kinase pathways. Results PD‐L1 expression was found in 16% of the MPM tumor samples, either in the tumor cells or the infiltrating immune cells. Gene expression analysis suggested that MPM is an inflamed tumor type and can be classified into three different subgroups on the basis of the different expression profiles of immune‐related genes, of which two groups showed varying degrees of expression of immune‐related genes. Overall, these molecular findings suggest that these subgroups of MPM associated with PD‐L1 positivity and expression of immune‐related genes accounting for 60% of MPMs represent a candidate subtype that may respond to cancer immunotherapy. Conclusions These data suggest that 60% of patients with MPM characterized by either PD‐L1 expression or an inflamed status are attractive candidates for cancer immunotherapeutic options.
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