Katie Thurston gave a health update amid her ongoing stage IV breast cancer battle. "I wanted to give an update on my latest chapter as someone experiencing [and] navigating stage IV breast cancer. The thing that people don't realize with stage IV is I will be on medication for the rest of life," the former Bachelorette, 34, said in a Friday, September 19, Instagram video. "It's kind of like a maintenance plan, which is great but also can be scary." Thurston added that as she continues to treat her cancer, there is the possibility that her "medication stops working.