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When T cells, a type of immune cell that can attack cancer, are exposed to a tumor for too long, they can become “exhausted” and lose their effectiveness. Researchers at St. Jude Children’s Research Hospital found that ZMYND8, a gene-regulating protein, helps drive this exhaustion by turning down IL-2 signaling, which helps T cells stay active. In mouse models, removing ZMYND8 helped T cells remain functional and improved their ability to control tumors, and combining ZMYND8 removal with either IL-2 or checkpoint blockade produced an even stronger response. The findings suggest that blocking ZMYND8 could potentially help overcome T-cell exhaustion and make existing immunotherapies more effective, although the research is still preclinical.