Breast cancer is the most common type of cancer among women. Although the prevalence varies between societies, it is known that 1 out of every 8-10 women in Western societies will develop breast cancer during their lifetime. Only 1% of all breast cancers occur in men.

The incidence of breast cancer has increased significantly in the last 50-60 years. This is partly due to changes in certain conditions that are considered risk factors (such as the postponement of the childbearing age to an older age). Since the 1980s, breast cancer can be diagnosed at earlier stages with the implementation of screening examinations and mammograms for early diagnosis of breast cancer.

Despite the increase in the incidence of breast cancer, mortality rates due to breast cancer are gradually decreasing as a result of advances in diagnosis and treatment.

While 10-15% of all breast cancers are familial, 85-90% occur in women without a family history.