By Kate Ward
Updated November 02, 2011 at 06:10 PM EDT

Former Survivor winner Ethan Zohn’s cancer has returned. People reports the reality star — who was in remission from Hodgkin’s lymphoma — was informed by doctors Sept. 14 that the cancer is in his chest. But there is some good news: The cancer hasn’t spread. “It’s localized in my lung area,” Zohn told People. “But it’s good that it’s not all over my body.”

Zohn has started chemotherapy, and plans to undergo a stem-cell transplant from one of his brothers. The Survivor is keeping his hopes up, and even plans to run in the New York City Marathon Nov. 6. “The doctors think I’m crazy but they gave me the okay,” Zohn told People. “Cancer isn’t going to slow me down. I want people to know that you can still live a fulfilled life and move forward.”