Although immunotherapy, including immune checkpoint inhibitors, has revolutionized cancer treatment, only a small percentage of patients show sustained response. Recently, we have shown that photobiomodulation (PBM) with near-infrared (NIR) light in the NIR-II window reduces oxidative stress and supports CD8+ T cell proliferation, suggesting that PBM with NIR-II light may enhance anticancer immunity. In this study, we report a novel approach to support tumor-infiltrating CD8+ T cells by PBM using NIR-II laser with high tissue penetration depth. Lasers are a safe and low-cost therapy that can be used in combination with a broad range of other therapies without modification.
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