Purpose of This Summary
This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about breast cancer screening. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.
Reviewers and Updates
This summary is reviewed regularly and updated as necessary by the PDQ Screening and Prevention Editorial...
The following classifications describe the most common types of
In situ: A tumor that
hasn't spread beyond the area where it began is called in situ.
Lobular carcinoma in situ (LCIS): Although not a true cancer, LCIS increases a woman's risk
of developing cancer. For this reason, it's important for women with LCIS to
have a physical exam 2 or 3 times a year, as well as a mammogram every
Ductal carcinoma in situ (DCIS): This is a precancerous condition also called Stage 0
breast cancer. It is noninvasive and is confined to the ducts. Almost all women who have DCIS can be successfully treated. The
best way to detect DCIS is with a mammogram.
Infiltrating (invasive) ductal carcinoma (IDC): This cancer starts in a milk duct, breaks through the
wall of the duct, and invades the fatty tissue of the breast. From there, it
can spread to other parts of the body. IDC is the most common type of breast
cancer, accounting for nearly 80% of cases.
Infiltrating (invasive) lobular carcinoma (ILC): This cancer
starts in the mammary, or milk, glands (lobules) and can spread to other parts
of the body. About 10% of breast cancers are this type.
Primary Medical Reviewer
Sarah Marshall, MD - Family Medicine
Specialist Medical Reviewer
Douglas A. Stewart, MD - Medical Oncology
June 28, 2011
WebMD Medical Reference from Healthwise
June 28, 2011
This information is not intended to replace the advice of a doctor.
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