Breast Cancer Survivorship Biorepository

This study is building a biological sample bank (biorepository) from breast cancer survivors. By collecting blood, tissue, and other samples over time, researchers hope to better understand what happens in the body after breast cancer treatment — and what factors affect long-term health. **You may be eligible if...** - You are a woman aged 18 or older of any racial or ethnic background - You were diagnosed with invasive breast cancer (stage I–III) within the past 7 years - You have completed active treatment (surgery, chemotherapy, HER2 therapy, and/or radiation) - You may have participated in other clinical trials previously **You may NOT be eligible if...** - You are currently enrolled in another interventional clinical trial - You have stage IV (metastatic) breast cancer - You have had a breast cancer recurrence (except after a DCIS diagnosis) - You are unable to give informed consent - You do not speak English, Spanish, Chinese, or Korean Talk to your doctor to see if this trial is right for you.