Ductal carcinoma in situ (DCIS) is a very early form of breast cancer that makes up about 1 out 5 cases of breast cancer. While any cancer diagnosis is scary, DCIS is noninvasive and very treatable. With appropriate treatment and follow-up care, the outlook is excellent. And the five-year survival rate for people diagnosed with DCIS is 98%.What is DCIS?DCIS is the earliest stage of breast cancer, sometimes called stage 0 breast cancer. The name ductal carcinoma in situ is a bit confusing. Here's what it means:Ductal: The cancer is in the cells lining the milk ducts. It might be in one or both...

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