This clinical trial is focused on studying treatments for advanced solid tumors, which are types of cancer that have spread and are difficult to remove surgically. The study will explore the effects of a new medication called ASP1570, both when used alone and in combination with another drug called pembrolizumab, which is also known by its brand name, Keytruda. These treatments aim to assess their safety and how well they are tolerated by patients.
The purpose of the study is to determine the best dosage and treatment plan for ASP1570, whether it is used by itself or alongside pembrolizumab. Participants in the study will receive either the new medication or a combination of the new medication and pembrolizumab. Some participants may receive a placebo, which is a substance with no active medication. The study will monitor participants over time to observe any changes in their health, including side effects and how their tumors respond to the treatment.
Throughout the study, participants will undergo regular health checks, including blood tests and other assessments, to ensure their safety and to gather information on how the treatments are working. The study is expected to continue until the end of 2027, with recruitment starting in 2024. This research is important for understanding how these treatments can help people with advanced solid tumors and to find the most effective way to use them.



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