I have been on vedolizimub for 3 years. One of the side effects apart from liver and kidney problems is squamous cell cancer,-. skin cancer. I was diagnosed with skin cancer a year ago and have told all my doctors who take no notice when I mention could it be my biologics, my dermatologist says she must see me every 6 months because I am on biologics even though I have had it removed, even the "Crohnes and Colitis" society who are the big deal for us in the UK, took no notice, but on a lot of web sites , it mentions it is a possible side effect. Having said that my crohnes is much improved. So it's a worry !!