Summary
The purpose of this study is to assess the efficacy and safety of belzutifan (MK-6482)
plus fulvestrant compared to everolimus plus endocrine therapy (ET) (investigator's
choice of fulvestrant or exemestane) in adults with estrogen receptor-positive, human
epidermal growth factor receptor 2-negative (ER+/HER2-) unresectable metastatic breast
cancer. There is no formal hypothesis testing in this study.