V10.3 OMIM 114480 DiseasesDB 1598 MedlinePlus 000913 eMedicine med/2808 med/3287 radio/115 plastic/521 MeSH D001943 Breast cancer ( malignant breast neoplasm ) is cancer originating from breast tissue, most commonly from the inner lining of milk ducts or the lobules that supply the ducts with milk. Cancers originating from ducts are known