It depends on his age. There is a higher increase for colon cancer with crohn's disease. I am 43, just had my second resection 3 months ago, now with a new skip area and started remicade last Thursday. My GI and I both talked about it, and to give me assurance for now, we have agreed on yearly colonoscopy's for my own piece of mind, but probably very uneccessary that close together. But in the same respect, I had a colonoscopy last year that was normal, and within the next 8 months developed active crohn's requiring surgery and now have a skip area we are treating with remicade. So who knows, everyone is so different. A consult with his GI is in order! Not sure if that helps or hurts.