In 2006, Allison was working at Sloan Kettering Memorial in New York when he was called down by oncologist Jedd Wolchock, who introduced him to Belvin - who was now cancer-free. She says in the film:  ‘Dr Allison walked in, and I pretty much almost lifted him up off the floor, gave him a giant bear hug. I just couldn’t talk. How in the world are you supposed to thank someone standing across from you that you are 100 percent positive that, without them, you wouldn’t be here? There is no thank you for that’