High-plex spatial analysis of T cell exhaustion using Imaging Mass Cytomerty for immuno-oncology studies 2622

Abstract Description Deciphering the spatial biology of the tumor microenvironment (TME) can inform researchers about the likelihood of therapeutic success. Of particular interest is the spatial organization of immune cells, especially T cells, which can undergo exhaustion resulting in reduced effector functions due to expression of inhibitory markers such as PD-1. Imaging Mass Cytometry™ (IMC™) technology is a quantitative multiplexed spatial imaging technique for assessment of 40-plus biomarkers simultaneously on the same tissue slide without signal amplification or autofluorescence interference. We used IMC technology to investigate the spatial distribution and phenotypic characteristics of immune cells, focusing on exhausted T cells in the TME of multiple cancers. Various IMC imaging modes revealed striking heterogeneity of the TME, including clusters of lymphocytes at the tumor margins, indicative of immune surveillance. Pixel-clustering and single-cell analyses delineated distinct tumor areas based on extent of T cell exhaustion, immune cell density, cell proliferation and stromal components. These findings illustrate the power of IMC technology to elucidate the complex spatial landscape of the TME, which may aid in developing prognostic assessments and guide personalized therapeutic strategies for cancer treatments. For Research Use Only. Not for use in diagnostic procedures. Topic Categories Tumor Immunology: Checkpoints, Prevention, and Treatment (TIPT)