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Why do powerful cancer immunotherapies work wonders for some patients but fail for others? The answer may lie not just in the cancer cells themselves, but in the energy levels of our own immune warriors. T cells, the elite soldiers of our immune system, often run out of steam in the hostile environment of a tumor, a phenomenon known as 'exhaustion.' But what if we could recharge their batteries? Emerging research reveals that the metabolic fitness of T cells—specifically the health of their mitochondria—is a critical battleground in the war on cancer, and scientists are now learning how to turn the tide. Introduction Our immune system is constantly on patrol, with CD8+ T cells acting as spec …