LAG3: A novel immune checkpoint expressed by multiple lymphocyte subsets in diffuse large B-cell lymphoma

Colm Keane*, Soi C. Law, Clare Gould, Simone Birch, Muhammed B. Sabdia, Lilia Merida de Long, Gayathri Thillaiyampalam, Emad Abro, Joshua W. Tobin, Xiaohong Tan, Zijun Y. Xu-Monette, Ken H. Young, Grace Gifford, Sara Gabreilli, William S. Stevenson, Anthony Gill, Dipti Talaulikar, Sanjiv Jain, Annette Hernandez, Sarah Jane HallidayRobert Bird, Donna Cross, Mark Hertzberg, Maher K. Gandhi

*Corresponding author for this work

    Research output: Contribution to journalArticlepeer-review

    74 Citations (Scopus)

    Abstract

    Blockade of the PD-1 axis has modest efficacy in diffuse large B-cell lymphoma (DLBCL), but data regarding LAG3 are sparse. The impact of LAG3 digital gene expression was tested in 309 patients with DLBCL treated with standard chemoimmunotherapy. Cellular distribution of LAG3 protein was determined by immunohistochemistry and flow cytometry. In tumor-infiltrating lymphocytes (TILs), LAG3 expression was highest on CD41 regulatory T cells (Tregs) and was also highly expressed on CD81 T cells compared with CD41 non-Tregs (both P 5 .008). LAG3high TILs were enriched in PD-1 and TIM-3. LAG3 was also expressed on a proportion of malignant B cells, and these patients had significantly higher LAG3 messenger RNA in their biopsies (P 5 .03). LAG3high gene expression was associated with inferior survival in discovery/validation cohorts, independent of cell of origin and the international prognostic index. Patients who were PD-L1high were fivefold more likely to be LAG3high (P , .0001). Patients who were LAG3high/PD-L1high had an inferior progression-free survival (P 5 .011) and overall survival (P 5 .005) compared with patients who were LAG3low/PD-L1high. Digital spatial protein analysis confirms LAG3 expression on T cells and, surprisingly, tumor-associated macrophages (TAMs) at higher levels than found on CD201 B cells in the tumor microenvironment. LAG3 is frequently expressed on CD41 Tregs and CD81 TILs, typically with other immune checkpoints, and is also present in a proportion of malignant B cells in DLBCL and in areas enriched for TAMs. LAG3high expression is associated with poor outcome independent of conventional prognosticators.

    Original languageEnglish
    Pages (from-to)1367-1377
    Number of pages11
    JournalBlood advances
    Volume4
    Issue number7
    DOIs
    Publication statusPublished - 14 Apr 2020

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