Diabetes doubles the risk of liver, pancreas, and endometrial cancer. It increases the risk of colorectal, breast, and bladder cancer by 20% to 50%. But it cuts men's risk of prostate cancer. People with type 2 diabetes are twice as likely to develop liver or pancreatic cancer. They also run a higher-than-normal risk of developing colon, bladder and breast cancer. Diabetic women with breast cancer have a higher mortality rate than women with breast cancer alone.