sEphB4-HSA in Treating Participants With BCG-Unresponsive or Refractory Bladder Cancer

This phase I trial studies the side effects and best dose of recombinant EphB4-HSA fusion protein (sEphB4-HSA), and to see how well it works in treating participants with bladder cancer that has come back or that isn't responding to bacillus Calmette-Guerin (BCG) vaccine treatment. sEphB4-HAS prevents tumor cells from multiplying and blocks several compounds that promote the growth of blood vessels that bring nutrients to the tumor. Giving sEphB4-HSA may work better in treating participants with bladder cancer.

PRIMARY OBJECTIVES: I. To establish the maximum tolerated dose (MTD) and recommended phase II dosing (RP2D) of intravesical sEphB4-HSA administration. II. To describe the dose limiting toxicities and adverse event profile of intravesical sEphB4-HSA administration in patients with bladder carcinoma in situ (CIS) and/or high grade T1/Ta bladder cancer (BCa). III. To describe the pharmacokinetics of intravesical sEphB4-HSA administration. IV. To explore the anti-tumor activity of intravesical sEphB4-HSA administration as manifested by responses to treatment. OUTLINE: This is a dose-escalation study. Participants receive sEphB4-HSA intravesically over 2 hours on days 1, 8, 15, 22, 29, and 36 in the absence of disease progression or unacceptable toxicity. After completion of study treatment, participants are followed up at 30 days, and again at 3 and 6 months.