T cells ditch exhaustion marker to escape tumors and protect against cancer relapse

As the immune system battles cancer, chronic stimulation gradually drives T cells to a state of exhaustion. But some of these exhausted T cells can lose expression of the exhaustion marker LAG3, move out of the tumor and confer long-lasting immunity to cancer in mice, according to a surprising new study published in the Journal of Experimental Medicine that describes a new method to track these cells for the first time.

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