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Genome-wide analysis uncovers novel recurrent alterations in primary central nervous system lymphomas #MMPMID25991819
Braggio E; Van Wier S; Ojha J; McPhail E; Asmann YW; Egan J; da Silva JA; Schiff D; Lopes MB; Decker PA; Valdez R; Tibes R; Eckloff B; Witzig TE; Stewart AK; Fonseca R; O?Neill BP
Clin Cancer Res 2015[Sep]; 21 (17): 3986-94 PMID25991819show ga
Purpose: Primary central nervous system lymphoma (PCNSL) is an aggressive non-Hodgkin lymphoma confined to the CNS. Whether there is a PCNSL-specific genomic signature and, if so, how it differs from systemic diffuse large B-cell lymphoma (DLBCL) is uncertain. Experimental design: We performed a comprehensive genomic study of tumor samples from 19 immunocompetent PCNSL patients. Testing comprised array-comparative genomic hybridization and whole exome sequencing. Results: Biallelic inactivation of TOX and PRKCD were recurrently found in PCNSL but not in systemic DLBCL, suggesting a specific role in PCNSL pathogenesis. Additionally, we found a high prevalence of MYD88 mutations (79%) and CDKN2A biallelic loss (60%). Several genes recurrently affected in PCNSL were common with systemic DLBCL, including loss of TNFAIP3, PRDM1, GNA13, TMEM30A, TBL1XR1, B2M, CD58, activating mutations of CD79B, CARD11 and translocations IgH-BCL6. Overall, BCR/TLR/NF-?B pathways were altered in >90% of PNCSL, highlighting its value for targeted therapeutic approaches. Furthermore, integrated analysis showed enrichment of pathways associated with immune response, proliferation, apoptosis, and lymphocyte differentiation. Conclusions: In summary, genome-wide analysis uncovered novel recurrent alterations, including TOX and PRKCD, helping to differentiate PCNSL from systemic DLBCL and related lymphomas.