This is an open-label, multicenter, dose-escalation study designed to assess the safety, tolerability, and pharmacokinetics of GDC-0032 administered in combination with either docetaxel (Arm A) or with paclitaxel (Arm B) in patients with HER2-negative locally recurrent or metastatic breast cancer. Stage 1: Both Arms A and B will employ a dose-escalation design with escalating doses of GDC-0032. Once the maximum tolerated dose of GDC-0032 has been established, additional patients will be enrolled in the cohort-expansion stage (Stage 2).
