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    Breast Cancer Types

    Breast Cancer Types

    Topic Overview

    Breast cancer is the abnormal growth of the cells that line the ducts and lobes of the breast. The main types of breast cancer are:

    • Ductal carcinoma, which is cancer that begins in the ducts of the breast. This is the most common type of breast cancer.
    • Lobular carcinoma, which is cancer that begins in the lobes of the breast. This is the second most common type.
    • Some breast cancer is a mixture of both ductal and lobular carcinoma.

    There are also some less common types of breast cancer, such as inflammatory breast cancer .

    When abnormal cells in the lining of a duct or lobe of the breast haven't spread, they are said to be "in situ" (say "in-SY-too").

    Credits

    By Healthwise Staff
    Primary Medical Reviewer Sarah Marshall, MD - Family Medicine
    Specialist Medical Reviewer Douglas A. Stewart, MD - Medical Oncology
    Last Revised June 28, 2013

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