Ken Shefveland
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In this photo taken March 29, 2017, Ken Shefveland smiles as he talks about the success of his treatment in a research study run by the Fred Hutchinson Cancer Research Center in Seattle. Shefveland had some of his immune cells genetically reprogrammed into an army of "living drugs" that could better seek and destroy his cancer, the next frontier in immunotherapy. (AP Photo/Elaine Thompson)
