Study of Erdafitinib Intravesical Delivery System for Localized Bladder Cancer

Inclusion Criteria: Parts 1-3: * Muscle-invasive or recurrent, non-muscle-invasive urothelial carcinoma of the bladder * For selected Cohorts: Activating tumor pan-fibroblast growth factor receptor (FGFR) mutation or fusion, as determined by local or central testing, approved by the sponsor prior to the start of study treatment. Local tissue-based results (if already existing) from next-generation sequencing (NGS) or polymerase chain reaction (PCR) tests performed in Clinical Laboratory Improvement Amendments (CLIA) -certified or equivalent laboratories, or results from commercially available PCR or NGS tests * Cohorts 1 and 2: Bacillus Calmette-Guérin (BCG) experienced, or participants with no BCG experience because BCG was not available as a treatment option in the participant's location within the previous 2 years and is currently unavailable. Participants who received an abbreviated course of BCG due to toxicity are still eligible * Cohort 1 only: Refuses or is not eligible for radical cystectomy (RC) * Cohorts 2 and 4: Willing and eligible for RC Part 4: * Have histologically confirmed diagnosis of recurrent Intermediate-risk-non-muscle invasive bladder cancer (IR-NMIBC) Ta LG tumors * Must not have undergone tumor debulking or selective ablation of visible lesions; partial tumor biopsy to confirm diagnosis and provide tissue for biomarker testing is permitted as long as remaining tumor is at least 5 millimeter (mm) in size * Must submit tissue and urine for FGFR tes…