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CAR-T immunotherapy, in which a body’s own T cells are reengineered to attack a patient’s tumor, has picked up steam in recent years. But T cells aren’t the only immune cells that scientists are tinkering with.

A team of researchers from the University of Central Florida has found that “natural killer cells” in the body may also play a compelling role in attacking cancer. It may be possible to enhance that response by taking immune cells from a cancer patient’s close blood relatives and infusing those into the patient to attack their tumors. Unlike CAR-T therapy, which so far is restricted to use in blood cancers, there’s hope that these NK cells could be used to treat solid tumors as well.

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