Phase III Study of Inavolisib Plus CDK46 Inhibitor and Letrozole Compared to Placebo Plus CDK46 Inhibitor and Letrozole in Adults With PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer

What this Trial Is About

Researchers are evaluating the effectiveness and safety of combining inavolisib with a cyclin-dependent kinase 4 and 6 inhibitor CDK46i and letrozole compared to placebo plus CDK46i and letrozole in adults with endocrine-sensitive PIK3CA-mutated hormone receptor-positive HR, HER2-negative advanced breast cancer. This phase III, randomized, double-blind study focuses on participants who have measurable disease and meet specific hormone receptor and HER2 status criteria. Participants are randomly assigned to receive either oral inavolisib once daily along with letrozole and CDK46i or placebo once daily with letrozole and CDK46i. The CDK46i is given on a schedule of either Days 1-21 or Days 1-28 of each 28-day cycle. The study includes parallel groups to compare these treatment combinations over time. During the study, participants will be monitored for progression-free survival, overall survival, response rates, duration of response, clinical benefit, and changes in pain, physical function, and global health status. Safety will be assessed by tracking adverse events and patient-reported treatment side effects using questionnaires. The study will follow participants for up to seven years, with regular evaluations to track disease status and quality of life.

A Study Evaluating the Efficacy and Safety of Inavolisib Plus CDK4/6 Inhibitor and Letrozole vs Placebo + CDK4/6i and Letrozole in Participants With Endocrine-Sensitive PIK3CA-Mutated, Hormone Receptor-Positive, HER2-Negative Advanced Breast Cancer