MET -Oncogenic and JAK2 -Inactivating Alterations Are Independent Factors That Affect Regulation of PD-L1 Expression in Lung Cancer.

Autor:	Saigi M; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Alburquerque-Bejar JJ; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Mc Leer-Florin A; Département d'Anatomie et Cytologie Pathologiques, Pôle de Biologie et Pathologie, CHU Grenoble Alpes, Grenoble and Université Grenoble Alpes, Grenoble, France., Pereira C; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Pros E; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Romero OA; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Baixeras N; Pathology Department, Bellvitge University Hospital, Hospitalet de Llobregat, Barcelona, Spain., Esteve-Codina A; CNAG-CRG, Centre for Genomic Regulation (CRG), Barcelona Institute of Science and Technology (BIST), Barcelona, Spain.; Universitat Pompeu Fabra (UPF), Barcelona, Spain., Nadal E; Department of Medical Oncology, Catalan Institute of Oncology (ICO), Hospitalet de Llobregat, Barcelona, Spain.; Clinical Research in Solid Tumors (CReST) Group, OncoBell Program, Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain., Brambilla E; Département d'Anatomie et Cytologie Pathologiques, Pôle de Biologie et Pathologie, CHU Grenoble Alpes, Grenoble and Université Grenoble Alpes, Grenoble, France., Sanchez-Cespedes M; Genes and Cancer Group, Cancer Epigenetics and Biology Program (PEBC), Bellvitge Biomedical Research Institute (IDIBELL), Hospitalet de Llobregat, Barcelona, Spain. mscespedes@idibell.cat.
Jazyk:	angličtina
Zdroj:	Clinical cancer research : an official journal of the American Association for Cancer Research [Clin Cancer Res] 2018 Sep 15; Vol. 24 (18), pp. 4579-4587. Date of Electronic Publication: 2018 Jun 13.
DOI:	10.1158/1078-0432.CCR-18-0267
Abstrakt:	Purpose: The blockade of immune checkpoints such as PD-L1 and PD-1 is being exploited therapeutically in several types of malignancies. Here, we aimed to understand the contribution of the genetics of lung cancer to the ability of tumor cells to escape immunosurveillance checkpoints. Experimental Design: More than 150 primary non-small cell lung cancers, including pulmonary sarcomatoid carcinomas, were tested for levels of the HLA-I complex, PD-L1, tumor-infiltrating CD8 + lymphocytes, and alterations in main lung cancer genes. Correlations were validated in cancer cell lines using appropriate treatments to activate or inhibit selected pathways. We also performed RNA sequencing to assess changes in gene expression after these treatments. Results: MET -oncogenic activation tended to associate with positive PD-L1 immunostaining, whereas STK11 mutations were correlated with negative immunostaining. In MET -altered cancer cells, MET triggered a transcriptional increase of PD-L1 that was independent of the IFNγ-mediated JAK/STAT pathway. The activation of MET also upregulated other immunosuppressive genes ( PDCD1LG2 and SOCS1 ) and transcripts involved in angiogenesis ( VEGFA and NRP1 ) and in cell proliferation. We also report recurrent inactivating mutations in JAK2 that co-occur with alterations in MET and STK11, which prevented the induction of immunoresponse-related genes following treatment with IFNγ. Conclusions: We show that MET activation promotes the expression of several negative checkpoint regulators of the immunoresponse, including PD-L1. In addition, we report inactivation of JAK2 in lung cancer cells that prevented the response to IFNγ. These alterations are likely to facilitate tumor growth by enabling immune tolerance and may affect the response to immune checkpoint inhibitors. Clin Cancer Res; 24(18); 4579-87. ©2018 AACR . (©2018 American Association for Cancer Research.)
Databáze:	MEDLINE
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