They had apparently burned their bridges at Harvard. At one point, when Dr. Reed needed to return to Brigham and Women’s for a medical procedure, she and Dr. Noorchashm were stunned to find that the hospital had assigned a guard to inspect their bags and escort them at all times, for security reasons. Dr. Noorchashm called a lawyer. A judge put a stop to the escort, issuing a restraining order against the hospital.

The gynecology profession also fought back against Dr. Noorchashm and Dr. Reed, insisting that leiomyosarcoma was so rare that the benefit of morcellation — the ability to have minimally invasive surgery — far outweighed any risk.

Before 2013, the F.D.A. had received no reports of uterine cancers being spread by morcellators. But after Dr. Reed and her husband went public — interviewed by newspapers, magazines and TV news shows — reports began to pour in. Dr. Reed, with her hair gone and her youngest child sometimes climbing onto her lap during interviews, was a sympathetic figure.

The couple’s efforts gained traction. The F.D.A. responded by studying published and unpublished medical data on morcellation. Before then, estimates of how many women with fibroids would have undiagnosed leiomyosarcomas or other uterine sarcomas were based on studies of varying reliability, and ranged from 1 in 10,000 to in 1 in 500. But the F.D.A. concluded in April 2014 that hidden sarcomas were more common than earlier estimates had stated — and probably occurred in about one in 350 women with fibroids. The tumors are extremely difficult to detect without surgery.

Soon after the F.D.A. issued its findings, one maker of morcellators, Johnson & Johnson, pulled its devices off the market. But others remained.

In November 2014, the F.D.A. went further, recommending that power morcellators not be used in the vast majority of women having fibroid surgery. Using the device in women with undetected sarcomas, it said, “may spread cancer and decrease the long-term survival of patients.” The F.D.A. portrayed the statement as a “safety communication,” not as an announcement of a new regulation.

Morcellator use dropped significantly, but many gynecologists still favored it, and the devices remained available. Dr. Noorchashm and Dr. Reed would not settle for less than a complete ban, and continued to agitate. They prodded legislators to ask the Government Accountability Office to investigate morcellation.