Understanding Breast Cancer Subtypes: Ductal Carcinoma In Situ

Although breast cancer has been a human disease for thousands of years, ductal carcinoma in situ or DCIS is a relatively new diagnosis. Researchers are continuing to find new information about this breast cancer subtype. Before mammography was a routine part of medical care, DCIS was not found often. Now, approximately 24% of all new cases of breast cancer diagnosed in the United States are classified as DCIS, with one case of DCIS detected per 1300 screening mammograms in North America.