This clinical trial is focused on studying two types of cancer: non-small cell lung cancer and pleural mesothelioma. These are serious conditions where cancer cells form in the tissues of the lung or the lining of the chest. The study is testing a combination of two medications, niraparib and dostarlimab. Niraparib is taken as a capsule, while dostarlimab is given through an intravenous infusion, which means it is delivered directly into the bloodstream through a vein.
The purpose of the study is to see how well this combination of medications works in patients who have these cancers and specific genetic features, such as being positive for PD-L1 expression and having mutations in the HRR genes. PD-L1 is a protein that can affect the immune system’s ability to fight cancer, and HRR genes are involved in repairing DNA. The study will follow participants over a period of up to 24 months to observe the effects of the treatment.
Participants in the study will receive the medications and be monitored regularly to assess their health and the progression of their cancer. The study aims to understand how long patients can live without their cancer getting worse, how their cancer responds to the treatment, and the overall safety of using niraparib and dostarlimab together. Some participants may receive a placebo, which is a substance with no active medication, to compare the effects of the treatment. The study will help determine if this combination of medications can be a beneficial treatment option for these types of cancer.



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