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• W2912552280 abstract "Abstract We performed a genomic, transcriptomic, and immunophenotypic study of 347 patients with diffuse large B-cell lymphoma (DLBCL) to uncover the molecular basis underlying acquired deficiency of MHC expression. Low MHC-II expression defines tumors originating from the centroblast-rich dark zone of the germinal center (GC) that was associated with inferior prognosis. MHC-II–deficient tumors were characterized by somatically acquired gene mutations reducing MHC-II expression and a lower amount of tumor-infiltrating lymphocytes. In particular, we demonstrated a strong enrichment of EZH2 mutations in both MHC-I– and MHC-II–negative primary lymphomas, and observed reduced MHC expression and T-cell infiltrates in murine lymphoma models expressing mutant Ezh2Y641. Of clinical relevance, EZH2 inhibitors significantly restored MHC expression in EZH2-mutated human DLBCL cell lines. Hence, our findings suggest a tumor progression model of acquired immune escape in GC-derived lymphomas and pave the way for development of complementary therapeutic approaches combining immunotherapy with epigenetic reprogramming. Significance: We demonstrate how MHC-deficient lymphoid tumors evolve in a cell-of-origin–specific context. Specifically, EZH2 mutations were identified as a genetic mechanism underlying acquired MHC deficiency. The paradigmatic restoration of MHC expression by EZH2 inhibitors provides the rationale for synergistic therapies combining immunotherapies with epigenetic reprogramming to enhance tumor recognition and elimination. See related commentary by Velcheti et al., p. 472. This article is highlighted in the In This Issue feature, p. 453" @default.
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• W2912552280 date "2019-04-01" @default.
• W2912552280 modified "2023-10-18" @default.
• W2912552280 title "Molecular and Genetic Characterization of MHC Deficiency Identifies EZH2 as Therapeutic Target for Enhancing Immune Recognition" @default.
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• W2912552280 doi "https://doi.org/10.1158/2159-8290.cd-18-1090" @default.
• W2912552280 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/30705065" @default.
• W2912552280 hasPublicationYear "2019" @default.
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