Recruitment
CSIS
DCIS
Patients will be recruited among those with breast DCIS who underwent BCS and visited the outpatient department of participating sites of the TBCC-ARO DCIS trial. In the current protocol, no advertising or inducements will be permitted and recruited. Patients will be randomized by the TBCC-developing “Clinical Study Information System” (CSIS) by logging clinicopathological information on their respective websites.