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.