A Study of B-701 in Combination With Pembrolizumab in Treatment of Locally Advanced or Metastatic Urothelial Cell Carcinoma

Inclusion Criteria

• Have locally advanced (on TNM staging: T4b and any N, or any T and N2-3) or metastatic transitional cell carcinoma of the urothelium, including of the urinary bladder, urethra, ureter, and/or renal pelvis. The diagnosis must be histologically or cytologically confirmed.
• Have progression during or following platinum-containing chemotherapy or within 12 months of neoadjuvant or adjuvant treatment with platinum-containing chemotherapy.
• Have available archival tumor or be willing to undergo diagnostic biopsy at screening. Sample must be of suitable quality and quantity to satisfy group assignment and biomarker endpoints.
• Have measurable disease according to Response Evaluation Criteria in Solid Tumors Version 1.1 (RECIST v1.1).
• Eastern Cooperative Oncology Group (ECOG) performance status (PS) ≤ 1. Key

Exclusion Criteria

• Participants with a history of idiopathic pulmonary fibrosis, organizing pneumonia, drug-induced pneumonitis, idiopathic pneumonitis, or evidence of active pneumonitis on the Screening chest CT scan.
• Prior therapy with an anti-programmed cell death 1 (PD-1) or anti-PD-Ligand 1 agent, or with an agent directed to another co-inhibitory T-cell receptor or FGFR inhibitor.
• Patients with autoimmune disease or medical conditions that required systemic corticosteroids (> 10 mg/day prednisone or its equivalent) or other immunosuppressive medications or any other form of systemic immunosuppressive therapy within 7 days prior to the first dose of study treatment. Note: Replacement therapy (e.g. physiologic corticosteroid replacement therapy for adrenal or pituitary insufficiency, etc.) is not considered a form of systemic treatment.
• Primary central nervous system (CNS) malignancy or CNS metastases.
• History of clinically significant coagulation or platelet disorder in the past 12 months.