Heart Cancer | Benign Or Malignant? Statistics And Survival Rates Heart cancer is extremely rare and though tumors of the heart do occur, they are most often benign. The risk of developing heart cancer is generally thought to be about 0.1% within a lifetime compared to risk rates for other cancer of up to 15% for breast cancer and about 7% for colon cancer. Heartcancer.net~Site InfoWhoisTrace RouteRBL Check