I am beginning the process of radiation after breast cancer (HR2) on my left breast. I have been classified as T3 by my radiologist simply because of the size of my tumor (8cm). There were no lymph nodes or other organs involved. Chest wall radiation has been the course of planned treatment. Everything I have read says that this is the most brutal of radiation and has the most cancer reoccurrence as well as the potential for heart damage and heart attacks. Heart disease has been the #1 killer in my family and up until now everything has been fine via echo's. Must I die of a heart attack in order to overcome cancer? Help! I am freaking out!