"Ask the Expert” features answers by our experts to your clinical questions. Question: A 29-year-old patient with no family history of cancer presented with a mass in her right breast. A mammogram showed microcalcification throughout the breast and a suspicious mass. A modified radical mastectomy was performed, and pathology showed ductal carcinoma in situ (DCIS). ER and PR were moderately positive; HER2 was negative.Immediate reconstruction was done. The patient is asking for adjuvant treatment.Answer: The...