This clinical trial is focused on studying treatments for hematologic malignancies, which are types of cancer that affect the blood, bone marrow, and lymph nodes. The study involves two medications: favezelimab and pembrolizumab. Favezelimab, also known by its code name MK-4280, is a solution given through an intravenous infusion, which means it is administered directly into the bloodstream. Pembrolizumab, also known as Keytruda or MK-3475, is also given as an intravenous infusion.
The purpose of this study is to evaluate the safety and effectiveness of using favezelimab in combination with pembrolizumab, as well as to assess each medication when used alone. Participants in the study will receive these treatments and will be monitored for any side effects or reactions. The study aims to determine the best dose for future research and to understand how well these treatments work together or separately in treating hematologic malignancies.
Throughout the study, participants will undergo regular check-ups and tests to monitor their health and the effects of the treatment. This includes measuring the concentration of the medications in the blood and observing any changes in the cancer. The study will help researchers gather important information about these treatments, which could lead to better options for patients with hematologic malignancies in the future.



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