Teddi Mellencamp is "still in immunotherapy". The 44-year-old TV star wishes was "feeling better by now" - but Teddi has clarified her dad's recent comments that she's "suffering" and still "really sick" following her cancer battle. Teddi addressed the speculation after John Mellencamp, her dad, opened up about his daughter's health struggles. She’s got cancer in the brain, and she’s suffering right now." The TV personality - who underwent surgery and radiation treatment - explained that her immunotherapy sessions left her feeling highly anxious for "no apparent reason".