This clinical trial focuses on patients with metastatic or locally advanced urothelial cancer. The study aims to determine if patients whose cancer has specific genetic changes in DDR genes respond better to treatment with platinum-based chemotherapy compared to those without these genetic changes.
The treatment in this study involves a combination of medications given through intravenous infusion. Patients will receive either cisplatin or carboplatin together with gemcitabine hydrochloride. Some patients may also receive avelumab, which belongs to a group of medications called monoclonal antibodies that help the immune system fight cancer cells.
During the study, doctors will regularly check how well the treatment is working by taking scans and monitoring any side effects. The treatment period may last up to 18 months for chemotherapy medications and up to 24 months for avelumab. The effectiveness of the treatment will be measured by looking at how the tumors respond and how long patients live without their cancer getting worse.



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