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started an aromatase inhibitor at any time prior to initiation of CDK 4\u002F6 inhibitor).\n\nExclusion Criteria:\n\n* Verbal baseline alopecia \\>= 2 on an 11 point scale (from none = 0 to severe = 10). The question to use for this item is: Please rate your hair thinning or loss on a scale from 0 to 10, with 0 being no hair loss and 10 being complete hair loss\n* Planned receipt of chemotherapy or another cancer-directed therapy concurrently (e.g., everolimus, etc.; note that a CDK4\u002F6 inhibitor is allowed within cohort 3)\n* Prior use of endocrine therapy for breast cancer\n* Receipt of chemotherapy over the previous 6 months","FEMALE","18 Years",{"count":332,"type":333},170,"ESTIMATED","OBSERVATIONAL","This study evaluates endocrine therapy-induced alopecia among postmenopausal and premenopausal female patients with breast cancer. Alopecia is one of the most feared side effects of cancer-directed therapy, causing distress in women starting treatment for breast cancer. While alopecia is a well-known side effect of many chemotherapy drugs, it has also been reported by women undergoing endocrine therapy. Despite the frequent reports of alopecia related to endocrine therapy, hair loss is rarely reported as a side effect of endocrine therapy and the exact characterization of alopecia is not well understood. By having postmenopausal and premenopausal breast cancer patients describe their hair loss symptoms experienced while undergoing endocrine therapy, researchers may be able to better characterize the incidence, timing, duration, and severity of alopecia and whether the different types of endocrine therapy cause more or less trouble in this regard.",[337],"Breast Carcinoma","2026-04-28",{"date":340,"type":341},"2026-04-30","ACTUAL",{"date":343,"type":341},"2022-07-06",{"date":345,"type":333},"2028-06-30",{"name":5,"class":6},23]