Hmm. That is one very tricky one. So a cancer is a term used to describe an abnormal growing cell in the body, it is called so when a group of cells have lost their grow control factors and such become either invasive or metastatic spread through and into other parts of the body. Sometimes when these cells originate from the breast they are called breast cancer. Breast Cancer needs also to be differentiated from secondary metastasis to the breast where there is a cancer from another part of the body which spreads to the breast.
Now there are several risk factors of breast cancer if you may like to know..