Ductal Carcinoma in Situ — The Focus for Prevention, Screening, and Breast Conservation in Breast Cancer

We entered this century with a confusion of terms for benign conditions of the breast that are possibly associated with cancer, summarized by J.C. Warren in 1905.1 We exit this century with a broad consensus that largely fulfills Warren's call for consistent terminology, not only for pathologists and surgeons but also for other specialists involved in the diagnosis and treatment of breast disease. We now have general agreement about criteria with respect to histologic diagnoses, epidemiologic associations, and prognostic implications. The various subtypes of the group of conditions known as ductal carcinoma in situ are the pivotal conditions between benign . . .