Gadis Bandung. Breast cancer is a disease caused by abnormal cell growth in breast tissue person. When you have reached an advanced stage, breast removal is sometimes performed for patient safety. This is certainly a scary thing for a woman. Almost all cancers have a specific cause. For example, most cases of skin cancer caused by ultraviolet rays of the sun. While lung cancer caused by smoking. But there is no single definitive cause for breast cancer. Several factors could be the cause of breast cancer. For example, genetic factors, environmental, and hormones may contribute in breast cancer. Women are vulnerable to these factors may have had a higher risk.