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lüll Breast Ductal Carcinoma in Situ Tomlinson-Hansen S; Khan M; Cassaro SStatPearls-/-ä 2024[Jan]; ä (ä): äDuctal carcinoma in situ (DCIS), also referred to as intraductal carcinoma, is a non-invasive breast cancer characterized by a proliferation of abnormal epithelial cells confined within the basement membrane. Disruption of the basement membrane layer would change the diagnosis from DCIS to invasive breast cancer. DCIS is considered to be a precursor for invasive breast cancer. Specifically, the World Health Organization defines the term DCIS as "a neoplastic proliferation of epithelial cells confined to the mammary ductal-lobular system and characterized by subtle to marked cytologic atypia and an inherent but not necessarily obligate tendency to progression to invasive breast cancer." Although grouped, DCIS is, in reality, a heterogeneous group of lesions that varies in the clinical presentation, genetics, biomarkers, morphologic features, as well as the clinical potential to progress to invasive breast cancer. Rates of diagnosis have been increasing with the use of screening mammography that detects pre-clinical microcalcifications. However, the diagnosis of DCIS does require a tissue biopsy. The treatment for DCIS is multidisciplinary and may include surgery, hormone therapy, and radiation therapy.ä |