A Study Assessing the Safety and Efficacy of Adding Ipatasertib to Paclitaxel Treatment in Participants With Breast Cancer That Has Spread Beyond the Initial Site, and the Cancer Does Not Have Certain Hormonal Receptors

This multicenter, randomized, double-blind study will estimate the efficacy, safety and tolerability of ipatasertib combined with paclitaxel compared with placebo combined with paclitaxel in participants with inoperable locally advanced or metastatic triple-negative breast cancer (mTNBC), as measured by progression-free survival (PFS) in all participants and in participants with phosphatase and tensin homolog (PTEN)-low tumors.