This clinical trial is focused on studying treatments for metastatic or locally advanced urothelial cancer, a type of cancer that affects the bladder and other parts of the urinary system. The study is evaluating the safety and effectiveness of a medication called erdafitinib, which is taken as a film-coated tablet. Erdafitinib is being tested alone and in combination with another medication called cetrelimab, which is given as an infusion into a vein. Additionally, the study is exploring the combination of erdafitinib and cetrelimab with chemotherapy drugs, cisplatin or carboplatin, which are also administered through an intravenous drip.
The purpose of this study is to understand how these treatments work in the body, how they are processed and eliminated, and to determine their safety and potential benefits for patients with this type of cancer. The study is divided into two phases. In the first phase, the focus is on finding the best dose and schedule for using erdafitinib with cetrelimab, and with chemotherapy. The second phase aims to evaluate the safety and effectiveness of erdafitinib alone and in combination with cetrelimab in patients who cannot receive cisplatin and have specific changes in their FGFR genes, which are involved in cell growth and division.
Participants in the study will receive the study medications and will be monitored for any side effects and how well the cancer responds to the treatment. The study will help researchers gather important information about these treatment options for urothelial cancer, potentially leading to new ways to manage the disease.



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