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Cancer that begins in the lobules (the glands that make milk) of the breast. Lobular carcinoma
in situ (LCIS) is a condition in which abnormal cells are found only in the lobules. When cancer
has spread from the lobules to surrounding tissues, it is invasive lobular carcinoma. LCIS does
not become invasive lobular carcinoma very often, but having LCIS in one breast increases the
risk of developing invasive cancer in either breast.