Hoffmann-La Roche
This is a Phase III, multicenter, randomized, open-label, global study designed to evaluate the efficacy and safety of inavolisib plus fulvestrant compared with alpelisib plus fulvestrant in patients with hormone receptor (HR)-positive, human epidermal growth factor receptor 2 (HER2) -negative, PIK3CA-mutated, locally advanced (LA) or metastatic breast cancer (mBC), who progressed during or after cyclin dependent kinase 4/6i (CDK4/6i)-based therapy. Enrollment for the main study is now complete.
The drug-drug interaction (DDI) substudy will evaluate the impact of repeat doses of inavolisib (coadministered with fulvestrant) on single-dose pharmacokinetics of sensitive CYP450 enzyme substrates (midazolam, omeprazole and bupropion) in participants with hormone receptor (HR)-positive, HER2-negative, PIK3CA-mutated, locally advanced (LA) or metastatic breast cancer (mBC), who progressed during or after CDK4/6 inhibitor (CDK4/6i) in combination with endocrine therapy (ET). Enrollment for the substudy is now open to recruitment.
Inclusion Criteria for Main Study and Sub-study: * If pre/perimenopausal women and men treatment with luteinizing hormone-releasing hormone (LHRH) agonist therapy beginning at least 2 weeks prior to Day 1 of Cycle 1 * Histologically or cytologically confirmed adenocarcinoma of the breast that is locally advanced or metastatic and is not amenable to surgical or radiation therapy with curative intent * Documented HR +/ HER2- tumor according to American Society of Clinical Oncology/College of American Pathologists (ASCO/CAP) guidelines * Confirmation of biomarker eligibility: detection of specif…
Participants will be administered a 9 milligram (mg) inavolisib tablet orally once a day (PO QD) on Days 1-28 of each 28-day cycle of main study and sub-study.
Participants will be administered 500 mg of fulvestrant on Days 1 and 15 of Cycle 1 and then on Day 1 of each subsequent 28-day cycle of main study and sub-study.
Alpelisib will be administered to participants at the approved dose in combination with fulvestrant: 300 mg taken PO QD and on days 1-28 of each 28-day cycle.
Participants will be administered bupropion PO on Day -3 and Day 12 of Cycle 1 of the sub-study.
Participants will be administered omerprazole PO on Day -4 and Day 11 of Cycle 1 of sub-study.
Participants will be administered midazolam PO on Day -4 and Day 11 of Cycle 1 of sub-study.