"I was scared that I was going to die. I felt like defeated almost because I was back in action. ... My life was going like how I envisioned it."
Zohn said he began a new course of chemotherapy Oct. 18.
"With this new drug SGN-35, they aren't nearly as bad as they were," he told People.com. "Just lethargy, nausea, headaches for a little while, but now I'm feeling good and I'm continuing to train for the New York City Marathon."
Zohn was first diagnosed with cancer in April 2009 and underwent various courses of treatment. The disease was in remission from April 2010 until September 2011.