Because of the success of x-ray mammography, tiny growths are being discovered that raise concerns about a woman's risk of developing breast cancer. These growths are called carcinoma in situ or noninvasive cancer. Today 15% to 20% of breast "cancers" fall into this category. Two types exist:

*Ductal carcinoma in situ (DCIS) is noninvasive, which means it is limited to the milk ducts of the breast. It has NOT spread beyond the breast, to the lymph nodes in the armpit, or to other parts of the body. However, there are several types of DCIS. If it is not removed, some types may in time change and develop into an invasive cancer. Some may NEVER progress to an invasive cancer.

*Lobular carcinoma in situ (LCIS) is a noninvasive growth limited to the milk lobules of the breast. It is NOT cancer, only warning sign of increased risk of developing cancer, according to the National Cancer Institute. Women with LCIS have about a 1% risk of developing invasive breast cancer equally in either breast per year. At 20 years, this risk is about 18%.