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- W2954635504 abstract "Aberrant activation of the JAK-STAT pathway is a hallmark of a variety of lymphomas and can alter the lymphoma cells secretome and the composition of the tumor microenvironment (TME). The up-regulation of the immune regulatory chemokine CCL17 has been shown to be mediated by STATs-dependent mechanism in primary mediastinal B cell lymphoma (PMBCL). Here, we assembled a cohort of 340 R-CHOP-treated aggressive lymphomas with diffuse large B cell lymphoma (DLBCL) morphology to investigate JAK-STAT mutations (targeted gene sequencing), copy number (CN) alterations (SNP arrays), gene expression (RNAseq) and TME composition (IHC). The cohort was evaluated using FISH for BCL2, BCL6 and MYC rearrangements and the molecular classification assay, Lymph2Cx, to distinguish ABC vs GBC vs double-hit lymphomas with DLBCL morphology (DH-DLBCL). Among the 317 evaluable cases, 26 were DH-DLBCLs, 101 ABC, 155 GCB and 35 unclassified. In addition, we used the recently published Lymph3Cx assay (Mottok A. et al., Blood 2018) to identify cases with a molecular PMBCL (mPMBCL) expression signature within the GCB-DLBCL group (6.5%, 10/155 cases). Twenty-five of 155 GCB cases (16.1%) were classified as ‘uncertain PMBCL/DLBCL’. Mutational analysis of all cases (n=340) revealed the presence of JAK-STAT pathway mutations at the following frequencies: SOCS1 21.6%, STAT6 4.8%, IL4R 5.3% and 9p24 amplification 11.3%. These mutations were significantly enriched in the mPMBCL (n=10) group compared to the bona fide GCB (n=118) and intermediate phenotype group (uncertain PMBCL/DLBCL) (n=25) (p Citation Format: Elena Vigano, Gerben Duns, Daisuke Ennishi, Clementine Sarkozy, Bruce Woolcock, Faith Cheung, Elizabeth Chavez, Stacy S. Hung, Katsuyoshi Takata, Anja Mottok, Randy Gascoyne, Kerry J. Savage, Ryan Morin, David W. Scott, Christian Steidl. Somatic JAK-STAT mutations in subtypes of aggressive B-cell lymphomas with DLBCL morphology [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2019; 2019 Mar 29-Apr 3; Atlanta, GA. Philadelphia (PA): AACR; Cancer Res 2019;79(13 Suppl):Abstract nr 3765." @default.
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- W2954635504 date "2019-07-01" @default.
- W2954635504 modified "2023-09-23" @default.
- W2954635504 title "Abstract 3765: Somatic JAK-STAT mutations in subtypes of aggressive B-cell lymphomas with DLBCL morphology" @default.
- W2954635504 doi "https://doi.org/10.1158/1538-7445.sabcs18-3765" @default.
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