This study will evaluate the efficacy and safety of the combination of inavolisib plus a cyclin-dependent kinase 4 and 6 inhibitor (CDK4/6i) and letrozole versus placebo plus a CDK4/6i and letrozole in the first-line setting in participants with endocrine-sensitive PIK3CA-mutated hormone receptor-positive (HR+), human epidermal growth factor receptor 2-negative (HER2-), advanced breast cancer (ABC).
Participants will receive oral inavolisib once daily (QD).
Participants will receive oral placebo QD.
Participants will receive CDK4/6i on either Days 1-21 or Days 1-28 of each 28-day cycle.
Participants will receive oral letrozole QD.
Córdoba, Argentina
Rosario, Argentina
San Juan, Argentina
Caba, Argentina
Capital Federal, Argentina
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