This clinical trial is focused on studying a type of lung cancer known as small cell lung cancer. This is a condition where cancer cells form in the tissues of the lung and can spread quickly to other parts of the body. The study is investigating two treatments: MK-6070 and Ifinatamab Deruxtecan, also known by its code name I-DXd. Both treatments are given as a solution through an intravenous infusion, which means they are delivered directly into the bloodstream through a vein.
The purpose of the study is to evaluate the safety and effectiveness of these treatments in people whose cancer has returned or has not responded to previous treatments. The study will be conducted in two parts. In the first part, participants will receive either a combination of MK-6070 and I-DXd or I-DXd alone, to see how well these treatments are tolerated and how effective they are. In the second part, the focus will be on the safety and tolerability of MK-6070 alone in participants in Japan.
Participants in the study will receive the treatments at different times and will be monitored for any side effects or changes in their condition. The study aims to gather information on how the body responds to these treatments, including how long the treatments stay in the body and how they are processed. This information will help researchers understand the potential benefits and risks of these new treatment options for small cell lung cancer.



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