A Phase 3 Study to Evaluate Long-term Safety and Effectiveness of Pembrolizumab and Related Treatments in Adults with Advanced Tumors

What this Trial Is About

This research evaluates the long-term safety and effectiveness of pembrolizumab in participants with advanced tumors or hematologic malignancies who have previously taken part in Merck pembrolizumab-based studies. This phase 3 extension study includes participants currently on treatment or in follow-up from parent trials. The study has three phases based on participants prior treatment status First Course Phase, Survival Follow-up Phase, and Second Course Phase, allowing continuation or observation depending on prior participation. Participants receive pembrolizumab alone or combined with other treatments such as standard of care therapies, lenvatinib, olaparib, MK-4280, MK-4280A, or pembrolizumab with berahyaluronidase alfa. Dosing schedules vary by phase and regimen, including intravenous infusions of pembrolizumab every 3 or 6 weeks, oral lenvatinib capsules daily, oral olaparib tablets twice daily, and other biologics administered intravenously or subcutaneously. The study allows up to 35 doses in the First Course Phase and fewer doses in the Second Course Phase, with treatment durations adjusted for crossover eligibility and combination therapies. Participants are monitored through regular treatment visits involving drug administration and follow-up assessments. Researchers evaluate overall survival up to approximately 10 years, along with progression-free survival, event-free survival, and adverse events including serious and clinically significant side effects. The study includes ongoing safety monitoring up to around 40 months post-treatment. Participants remain under observation for long-term outcomes and potential treatment effects for many years after enrollment.

Long-term Safety and Efficacy Extension Study for Participants With Advanced Tumors Who Are Currently on Treatment or in Follow-up in a Pembrolizumab (MK-3475) Study (MK-3475-587/KEYNOTE-587)