Management and 5-year outcomes in 9938 women with screen-detected ductal carcinoma in situ: the UK Sloane Project.

Abstract Background Management of screen-detected ductal carcinoma in situ (DCIS) remains controversial. Methods A prospective cohort of patients with DCIS diagnosed through the UK National Health Service Breast Screening Programme (1st April 2003 to 31st March 2012) was linked to national databases and case note review to analyse patterns of care, recurrence and mortality. Results Screen-detected DCIS in 9938 women, with mean age of 60 years (range 46–87), was treated by mastectomy (2931) or breast conserving surgery (BCS) (7007; 70%). At 64 months median follow-up, 697 (6.8%) had further DCIS or invasive breast cancer after BCS (7.8%) or mastectomy (4.5%) (p  Conclusion Recurrent DCIS or invasive cancer is uncommon after screen-detected DCIS. Both RT and endocrine therapy were associated with a reduction in further events but not with breast cancer mortality within 5 years of diagnosis. Further research to identify biomarkers of recurrence risk, particularly as invasive disease, is indicated.