Merck’s Keytruda Meets Endpoint in Breast Cancer Trial
Merck says that its Phase 3 KEYNOTE-355 trial investigating anti-PD therapy Keytruda (pembrolizumab) in combination with chemotherapy met one of its dual primary endpoints of progression-free survival (PFS) in patients with metastatic triple-negative breast cancer whose tumors expressed PD-L1. An interim analysis found that first-line treatment with Keytruda in combination with chemotherapy (nab-paclitaxel, paclitaxel or gemcitabine/carboplatin) demonstrated a statistically significant and clinically meaningful improvement in PFS compared to chemotherapy alone, it says. Based on a recommendation from a data monitoring committee, the trial will continue without changes to evaluate the other dual primary endpoint — overall survival.
Merck says that Keytruda’s safety profile in the trial was consistent with that observed in previously reported studies, and no new safety signals were identified. “We look forward to sharing these findings with the medical community at an upcoming congress and discussing them with the FDA and other regulatory authorities,” it adds.