Three children Alejandro Gutierrez, MD, treated for leukemia during his fellowship at Boston Children's Hospital still haunt him more than a decade later. One 15-year-old boy died from the toxicity of the drugs he was given; the other two patients went through the whole treatment only to die when their leukemia came back. "That really prompted a deep frustration with the status quo," Gutierrez recalls. "It's motivated everything I've done in the lab since then."
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