For fear of making a gross generalisation, I think it's safe to say that most people, if they were diagnosed with a life-threatening disease, would not make going onstage to talk about it to strangers a priority. Not only that, but I think that even fewer people would want to get onstage and perform comedy about the disease they literally just found out that they had. I mean, what with all the tearful phone calls and general despair, where would you find the time?