“This is the first positive Phase 3 study evaluating an immunotherapy-based regimen for patients with high-risk, early-stage ER-positive, HER2-negative breast cancer, and an important milestone in our efforts to advance research in early-stage breast cancer,” said Dr. Gursel Aktan, vice president, global clinical development, Merck Research Laboratories. “We look forward to sharing the detailed results with the medical community and thank the patients and investigators for their important contributions to this study.”