Harvey Risch, a professor emeritus of epidemiology at the Yale School of Public Health, announced his appointment as chair of the President’s Cancer Panel on X earlier this month. The White House, the Department of Health and Human Services, the Cancer Panel, and Risch did not respond to requests for comment. As well as lending credibility to unproven treatments for Covid-19 like hydroxychloroquine and ivermectin—he promoted the former in congressional testimony—Risch has more recently wondered whether the Covid-19 vaccines cause “turbo cancer” in some people. Now experts are worried that he could derail critical research into the causes and treatments for cancer. “I am genuinely concerned that we are going to see ivermectin for cancer promoted at the federal level,” the doctor, who closely tracks the spread of medical disinformation, tells WIRED.