Last updated on November 2019

Study of 2 Ribociclib Doses in Combination With Aromatase Inhibitors in Women With HR+ HER2- Advanced Breast Cancer


Brief description of study

QT interval prolongation and neutropenia are considered to be important identified risks for ribociclib (Kisqali Prescribing Information, Investigator Brochure). The approved dosing regimen of ribociclib is 600 mg daily (QD) on a 3 weeks on/1 week off schedule.

The purpose of the study is to explore whether a reduced dosing regimen of 400 mg ribociclib orally QD 3 weeks on/1 week off may decrease the risk of QTc prolongation without compromising the efficacy of ribociclib in combination with an NSAI in pre- and postmenopausal women with HR-positive, HER2-negative aBC who have received no prior therapy for advanced disease. The risks of other AEs of special interest, such as neutropenia and hepatobiliary toxicity will be evaluated in this study as well.

Approximately 350 patients will be randomly assigned to one of the below treatment arms in a 1:1 ratio: Experimental arm (Arm 1) - Ribociclib 400 mg QD 3 weeks on/1 week off + NSAI (+ goserelin in premenopausal women): 175 patients Control arm (Arm 2) - Ribociclib 600 mg QD 3 weeks on/1 week off + NSAI (+ goserelin in premenopausal women): 175 patients Randomization will be stratified by the presence of lung and/or liver metastases (yes versus no).

Clinical Study Identifier: NCT03822468

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