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Eight years ago, a Dutch oncologist, John Haanen, set out to change melanoma treatment by arranging one of the largest and most rigorous trials ever for a cell therapy technique originally devised in the mid-’80s. He could not have picked worse timing.

Months after the trial began, European regulators approved the first PD-1 inhibitor, a groundbreaking immunotherapy. Patients clamored for it. “We had to wait,” Haanen said. 

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