derives from/develops from mammary duct mammary ductal carcinoma cell 2010-10-08T12:50:02Z BTO:0004851 BrendaTissueOBO The most common type of breast cancer in women. It comes in two forms: invasive ductal carcinoma (IDC), an infiltrating, malignant and abnormal proliferation of neoplastic cells in the breast tissue, or ductal carcinoma in situ (DCIS), a noninvasive, possibly malignant, neoplasm that is still confined to the milk ducts (lactiferous ducts), where breast cancer most often originates. mgr