Two Versus One Week Breast Radiotherapy (RT)

This study is comparing two different lengths of radiation therapy after breast-conserving surgery (lumpectomy): a 1-week course versus a 2-week course. Both are shorter than the traditional 5–6 week approach. Researchers want to see if the 1-week course is just as effective and safe as the 2-week schedule. **You may be eligible if...** - You are a woman who has had a lumpectomy for early-stage breast cancer (T1–T2) with clear margins - Your cancer has not spread to lymph nodes, or only a small number of nodes were involved - You have ductal carcinoma in situ (DCIS) with clear surgical margins - You have had previous cancer in the other breast but it was treated **You may NOT be eligible if...** - You previously received radiation to the same breast - It has been more than 90 days since your surgery (unless you had chemotherapy afterward) - It has been more than 60 days since your last chemotherapy - You are male - You have a severe autoimmune disease currently being treated Talk to your doctor to see if this trial is right for you.