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0 reviewsDietary nutrients are inextricably linked to antitumour immune responses. However, the efect of diet-derived galactose on antitumour immunity remains unclear. Here we show that dietary galactose augments CD8+ T cell immunity to suppress tumour progression. High-galactose feeding drives hepatocyte-derived insulin-like growth factor binding protein 1 (IGFBP-1) production, thus restraining IGF-1 signalling-dependent T cell exhaustion. IGF-1 receptor (IGF-1R) defciency in T cells potentiates antitumour CD8+T cell responses and phenocopies high-galactose feeding by preventing T cell exhaustion. Circulating galactose reprograms hepatocyte metabolism to inactivate mTORC1, thereby inducing the production of IGFBP-1 to boost CD8+ T cell function. Furthermore, patients with cancer who have high plasma IGFBP-1 levels exhibit blocked T cell exhaustion and enhanced T cell responses in tumour tissues. These fndings reveal that dietary galactose specifcally elicits potent antitumour CD8+ T cell responses by facilitating hepatocyte-derived IGFBP-1 production, providing insights into the development of more efective immunotherapies against cancers.
