Summary
This study will evaluate the effect of adding abemaciclib to fulvestrant for the treatment of
hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-)
breast cancer that progressed or recurred after previous treatment with a type of drug known
as a CDK4/6 inhibitor and endocrine therapy. Participation could last up to 5 years,
depending on how you and your tumor respond.