Per-Operative Radiotherapy by Papillon +TM in Localized Breast Cancer

This study is testing a technique that delivers radiation directly to the breast tumor during surgery (called intraoperative radiotherapy) using a device called Papillon+, as an alternative to weeks of radiation after surgery in older women with early-stage breast cancer. **You may be eligible if...** - You are a woman aged 65 or older - You have a small invasive breast cancer (2 cm or less) that is low or intermediate grade, hormone receptor-positive, and HER2-negative - The tumor is in one spot only (unifocal) - You are suitable for breast-conserving surgery - You have social health insurance coverage **You may NOT be eligible if...** - You are under 65 years old - Your tumor does not meet the specific size, grade, or receptor criteria - You are not a candidate for breast-conserving surgery Talk to your doctor to see if this trial is right for you.