Comment by joconne

My understanding is that even though immunotherapy's mechanism may seem more natural than chemotherapy and radiation, and in some instances may be a magic bullet, up-regulating the immune system can have serious consequences. I remember reading about a clinical trial showing similar progression free survival but increased grade 4-5 toxicities (requiring hospitalization or being fatal). My assumption was that these are autoimmune conditions that are aggravated in some of the patient population.