
handle: 2268/199547
TPS624Background: Inhibition of the cyclin D–cyclin dependent kinase (CDK)4/6–retinoblastoma pathway may overcome ET resistance and enhance the efficacy of existing ET regimens in HR+, HER2– aBC. Combination of the CDK4/6 inhibitor ribociclib (LEE) with fulvestrant (FUL) has demonstrated potent tumor regressions in preclinical HR+ breast cancer (BC) models (O’Brien et al. Cancer Res 2014;74:Abstr 4756). Methods: In this phase III, double-blind study (NCT02422615), postmenopausal patients with HR+, HER2– aBC (N≈660) will be randomized 2:1 to oral LEE (600 mg QD on Days 1–21 of each 28-day cycle) + FUL (500 mg intramuscularly on Days 1 and 15 of Cycle 1 and Day 1 of each cycle thereafter; Arm A) or placebo + FUL (Arm B). Randomization is stratified by presence of lung or liver metastases and prior ET. Patients may have newly diagnosed aBC that is treatment-naive, relapsed BC that has progressed at any time during/after (neo)adjuvant ET with no treatment for metastatic disease, relapsed BC that has progresse...
Oncology, oncology, Oncologie, Human health sciences, Sciences de la santé humaine
Oncology, oncology, Oncologie, Human health sciences, Sciences de la santé humaine
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