Factors affecting survival in women with ductal carcinoma in situ (DCIS): Race and the delivery of adjuvant radiotherapy.

29 Background: Recent publications questioned the survival impact of adjuvant radiotherapy (A-RT) in the treatment of DCIS. These reports had in common a short follow up. We wanted to know, in a disease where long term follow up is required, the magnitude of improvement in survival and assess any correlation with race and income. Methods: Search in the Surveillance, Epidemiology and End Results database, of patients diagnosed with DCIS between 1988 and 2012, younger than 70 years old. Analyses of age, race, hormonal receptors (HR), tumor size, surgery, ART and household income. Survival analyses with Kaplan-Meier and multifactorial with Cox proportional-hazard regression. Results: 125,805 patients. Mean follow-up 7.9 years. Patients treated with A-RT resulted in a mortality by breast cancer (DBC) significantly lower (-1.10%; HR: 0.54 [IC95%:0.48-0.59]; p < 0.0001). Based on the type of surgery, mastectomy resulted on a DBC significantly higher than those treated with tumorectomy and A-RT (+1.15%; HR: 2.08...