Ductal carcinoma in situ (DCIS) is an early, non-invasive form of breast cancer.

In DCIS, the cancer cells are completely contained in the ducts and lobules and have not invaded into surrounding breast tissue. However, DCIS can transform into invasive breast cancer. DCIS is therefore surgically managed; hormone therapy or radiotherapy may be considered.

Macmillan Cancer Support - DCIS

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