The study enroll a large population of approximately 252467 participants. This epidemiology study of diabetes and cancer risk is an expansion study which would include estimation of cancer rate among KPNC members with or without diabetes and the relative risks of cancers associated with a diagnosis of diabetes. The study included diabetes participants who were KPNC members between 1997 and 2011. It also included a subset of participants who took the 1996/7 diabetes survey and Member Health Survey (MHS) in 1993, 1999, 2001 or 2003.