At a glance
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A Phase III, Randomized, Double-Blind, Placebo-Controlled Clinical Trial to Evaluate the Efficacy and Safety of Pertuzumab + Trastuzumab + Docetaxel vs. Placebo + Trastuzumab + Docetaxel in Previously Untreated HER2-Positive Metastatic Breast Cancer
In Brief
A Phase 3 clinical trial evaluating Pertuzumab, Placebo, and 2 other interventions for Metastatic Breast Cancer. Completed, enrolled 808 participants across 322 sites in 26 countries.
Detailed Summary
This study was a Phase III, randomized, double-blind, placebo-controlled, multicenter international clinical trial conducted to investigate the use of pertuzumab in combination with trastuzumab and docetaxel as first-line treatment for participants with human epidermal growth factor receptor 2 (HER2)-positive metastatic breast cancer (MBC). Participants could have received one prior hormonal treatment for MBC. Participants may have received systemic breast cancer treatment in the neo-adjuvant or adjuvant setting, provided that the participant had experienced a disease-free interval (DFI) of greater than or equal to (≥)12 months from completion of adjuvant systemic treatment (excluding hormonal therapy) to metastatic diagnosis. Participants may have received trastuzumab and/or a taxane during the neo-adjuvant or adjuvant treatment. Participants were randomized in 1:1 ratio to receive either pertuzumab or placebo, along with trastuzumab and docetaxel once every 3 weeks (q3w), during the treatment phase of the study until investigator-assessed radiographic or clinical progressive disease, unmanageable toxicity, or study termination. Participants in the Placebo arm were not allowed to receive open-label pertuzumab after discontinuation from study treatment. However, if any analysis of overall survival had met the predefined criteria for statistical significance, participants in the Placebo arm still on treatment were offered the option to receive open-label pertuzumab in addition to other study medications.
Study Details
Timeline
Interventions
Pertuzumab was administered as an intravenous (IV) loading dose of 840 milligrams (mg) q3w on Day 1 of Cycle 1 (1 Cycle length = 21 days), and 420 mg q3w on Day 1 of subsequent cycles until investigator-assessed radiographic or clinical progressive disease, unmanageable toxicity, or study termination.
Placebo (matching pertuzumab) was administered intravenously.
Trastuzumab was administered as an IV loading dose of 8 milligrams per kilogram (mg/kg) q3w on Day 2 of Cycle 1 (1 Cycle length = 21 days), and 6 mg/kg q3w on Day 1 of subsequent cycles until investigator-assessed radiographic or clinical progressive disease, unmanageable toxicity, or study termination.
Docetaxel was administered as an IV dose of 75 milligrams per square meter of body surface area (mg/m\^2) q3w on Day 2 of Cycle 1 (1 Cycle length = 21 days), and 75 mg/m\^2 (up to 100 mg/m\^2 as per treating physician discretion) q3w on Day 1 of subsequent cycles until investigator-assessed radiographic or clinical progressive disease, unmanageable toxicity, or study termination. On or prior to Cycle 6, docetaxel was only to be discontinued for progressive disease or unmanageable toxicity. After Cycle 6, continuation of docetaxel treatment was at the discretion of the participant and treating physician.