Multiplexed single-cell and spatial profiling reveal B cells and tertiary lymphoid structures as prognostic indicators in pleural mesothelioma

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BackgroundPleural mesothelioma (PM) is an orphan disease with poor prognosis. While T cell dynamics in the tumor microenvironment (TME) have been extensively studied, the role of B cells remains poorly characterized. Tumor-infiltrating B cells, particularly when organized into tertiary lymphoid structures (TLS), have been associated with improved outcomes of patients with cancer.MethodsIn this study, high-dimensional flow cytometry (HDCyto) and high-plex imaging were applied to analyze fresh-frozen and formalin-fixed paraffin-embedded (FFPE) PM tumor samples, enabling a comprehensive immune profiling of the TME.ResultsWe identified 15 distinct immune cell subsets and stratified tumors into three subgroups with significantly different survival outcomes. Longer survival correlated with increased T and B cell infiltration, with B cells and CD4+ T cells forming TLS in specific cases.ConclusionsThese findings underscore the heterogeneity of PM tumors and highlight the critical role of B cells and TLS in shaping anti-tumor immunity and influencing patient prognosis.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.