
(ductal carcinoma in situ) An early type of breast cancer where the cells have not yet developed the ability to spread outside the walls of the ducts into surrounding breast tissue or to other parts of the body. Sometimes called a pre-invasive, intraductal or non-invasive cancer.
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http://www.breastcancercare.org.uk/breast-cancer-information/glossary

A noninvasive condition in which abnormal cells are found in the lining of a breast duct. The abnormal cells have not spread outside the duct to other tissues in the breast. In some cases, DCIS may become invasive cancer and spread to other tissues, although it is not known at this time how to predict which lesions will become invasive. Also called...
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http://www.cancer.gov/dictionary?expand=D

ductal carcinoma in situ.
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http://www.encyclo.co.uk/local/21001

DCIS stands for ductal carcinoma in situ. DCIS is an early form of breast cancer that starts in the milk ducts. See breast cancer section.
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http://www.encyclo.co.uk/local/21474

DCIS: Ductal carcinoma in situ. A precancerous condition characterized by the clonal proliferation of malignant-looking cells in the lining of a breast duct without evidence of spread outside the duct to other tissues in the breast or outside the breast. DCIS is clearly the precursor (forerunner) of invasive breast cancer. This is evident from the ...
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Ductal carcinoma in situ
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