Hypofractionated Radiation Therapy vs Standard Treatment in Breast Cancer.

This study compares a shorter, higher-dose radiation schedule (hypofractionated) to the standard longer radiation schedule for breast cancer patients who had breast-conserving surgery (a lumpectomy). **You may be eligible if...** - You have been diagnosed with early-stage breast cancer (DCIS or invasive) confirmed by biopsy - You had a lumpectomy (breast-conserving surgery) - Your cancer is stage pT1-T2, no lymph node spread, no distant spread - You are 18 or older **You may NOT be eligible if...** - Cancer has spread to your lymph nodes - Your tumor is large (stage T3 or T4) - You have had radiation to the same area before - Your surgical margins were not clear (positive margins after surgery) Talk to your doctor to see if this trial is right for you.