In March 2019, Shelly Busby began experiencing unusual vaginal bleeding. Frightened and concerned, she went to her OB/GYN for an examination and biopsy.

“There was something there that didn’t belong,” says Shelly, 67, a retired schoolteacher. “There was a tumor, and before I knew it, I was having surgery to have it removed.”

She was diagnosed with stage III vaginal cancer, for which there is currently no approved therapy...