Assessment of Brain Cognitive Impairment in Breast Cancer

This study examines whether breast cancer treatment (specifically chemotherapy) causes cognitive changes — sometimes called "chemo brain" — in premenopausal women with early-stage breast cancer. Brain function is tested before and after treatment to track any changes. **You may be eligible if...** - You are a premenopausal woman with early-stage (stage I–II) primary breast cancer - You have not yet started any treatment other than surgery - You are right-handed, in good physical condition (ECOG 0–1), and can complete questionnaires - You are willing to use contraception during the study if needed **You may NOT be eligible if...** - You have already started chemotherapy or other cancer treatment - You are postmenopausal - You are left-handed - You are unable to complete the study assessments Talk to your doctor to see if this trial is right for you.