- Patients must have completed their final breast surgery (rendering them free from disease) with clear resection margins for invasive cancer and ductal carcinoma in situ (DCIS) within 90 days prior to screening registration for patients not receiving post-operative (adjuvant) chemotherapy, or within 210 days prior to screening registration for patients who have completed post-operative (adjuvant) chemotherapy; positive margins are allowed only if the surgical team of the patient deems further resection impossible