Treos Bio Presents Data Showing PolyPEPI1018 Plus Anti-PD-L1 Remodels Tumor Microenvironment in MSS Colorectal Cancer

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Treos Bio announced new translational data from the Phase Ib/II OBERTO-301 study showing that its off-the-shelf cancer immunotherapy PolyPEPI1018 combined with anti-PD-L1 therapy remodels the tumor immune microenvironment in patients with microsatellite-stable metastatic colorectal cancer. The retrospective analysis of paired tumor biopsies and blood samples demonstrated increased CD8+ T-cell density and PD-L1 expression after treatment, indicating conversion toward a more inflamed tumor microenvironment. T-cell receptor sequencing revealed selective expansion of tumor-reactive T-cell clonotypes, including those targeting PolyPEPI1018 antigens, additional tumor-associated antigens, and neoantigens, suggesting antigen spreading. Higher numbers of tumor-reactive TCR clonotypes and higher post-treatment CD8+ TIL density were associated with longer overall survival and progression-free survival. The findings provide mechanistic evidence that therapeutic vaccination targeting shared tumor-associated antigens can convert immunologically cold MSS colorectal tumors into a more immunologically active, potentially checkpoint-responsive state.

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Data shows PolyPEPI1018 plus anti-PD-L1 remodels tumor microenvironment, improving survival in MSS colorectal cancer.

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