Randomized Phase II Study of Elacestrant vs Elacestrant Plus a CDK4/6 Inhibitor (Palbociclib, Abemaciclib, or Ribociclib) in Patients With ER+/HER2- Advanced or Metastatic Breast Cancer With Prior Exposure to a CKD4/6 Inhibitor
Northwestern University
Summary
Breast cancer is not only the leading cause of cancer in women, but also the leading cause of cancer deaths in women. Estrogen receptor-positive and HER2-negative breast cancer is the most prevalent breast cancer subtype. Endocrine therapy is the mainstay of treatment; however, due to the varied nature of the disease, development of resistance to this therapeutic approach is very common in the metastatic setting. The purpose of this study is to see whether the effectiveness of elacestrant can be enhanced by combining it with a targeted agent such as a CDK4/6 inhibitor to treat patients with ER+/HER2- or metastatic breast cancer with prior exposure to a CDK4/6 inhibitor.
Description
Primary Objective I. Evaluate progression-free survival (PFS) of patients with advanced or metastatic ERpositive/HER2-negative breast cancer who have been treated with either elacestrant monotherapy or combination therapy of elacestrant with a CDK4/6 inhibitor (palbociclib, abemaciclib, or ribociclib). PFS of the elacestrant monotherapy arm will be compared with PFS of the combination therapy arm. Secondary Objectives I. Assess toxicity profile of elacestrant combination therapy with a CDK4/6 inhibitor (palbociclib, abemaciclib, or ribociclib) in advanced or metastatic ER-positive/HER2- negat…