Lobular Carcinoma In Situ (LCIS)

What Is Lobular Carcinoma In Situ?

Lobular Carcinoma In Situ (LCIS) is a condition where abnormal cells are found in the lobules of the breast. The atypical cells have not spread outside of the lobules into the surrounding breast tissue.

LCIS is highly treatable and seldom becomes invasive cancer. However, having LCIS in one breast increases the risk of developing breast cancer in either breast.

What Does The Term “In Situ” Mean?

The earliest stages of cancers are called “carcinoma in situ.” Carcinoma means “cancer” and in situ means “in the original place.”

What Is The Difference Between Lobular Carcinoma In Situ (LCIS) and Ductal Carcinoma In Situ (DCIS)?

LCIS is very similar to DCIS. LCIS is cancer that’s in the lobules; DCIS is cancer that’s in the milk ducts.

Materials on this page courtesy of National Cancer Institute