Detection of breast cancer.

We do not know the cause of breast cancer, nor do we have any way of preventing the disease. All we have is conclusive evidence, based on an 18-year follow-up of the HIP data, that detection of the disease at an earlier than usual stage leads to substantial saving of lives. Our only means for accomplishing this end is through complete breast examination when a woman is apparently well. The examination must include modern mammography with the latest techniques as well as a thorough, competent clinical examination. We must perform periodic mass screening of all women who may be subject to breast cancer--all women older than age 35. Such mass screening procedures will reduce the death rate from the disease by up to 30%. Mass screening is the only means we have to save the lives of many women with breast cancer.