Study of Immediate Post-Operative Intravesical Instillation of Chemophase® in Patients With Superficial Bladder Cancer

Inclusion Criteria: * Patient with histologically confirmed or suspected (based on cystoscopy) initial presentation or recurrence of Stage Ta, T1, or Tis transitional cell bladder cancer of any histological grade requiring TURBT. * Patient believed to be a candidate for immediate post-operative chemotherapy regardless of the need for additional intravesical therapy. * ECOG performance status of Grade 0 or 1. * Age ≥ 18 years. * A negative urine or serum pregnancy test (if female of child-bearing potential) within 14 days prior to Day 1/Week 1. * Acceptable liver function within 14 days prior to Day 1/Week 1 defined as: * Total bilirubin ≤ 1.5 times upper limit of normal (ULN), and * AST (SGOT), ALT (SGPT), and alkaline phosphatase ≤ 2.5 times ULN. * Acceptable renal function within 14 days prior to Day 1/Week 1 defined as serum creatinine ≤ 1.5 x ULN. * Acceptable hematologic status within 14 days prior to Day 1/Week 1 defined as: * Absolute neutrophil count (ANC) ≥ 1,500/dL, * Platelet count ≥ 100,000/dL, and * Hemoglobin ≥ 10.0 g/dL. * Urinalysis showing no clinically significant abnormalities, except those attributable to bladder cancer. * For men and women of child-producing potential, agreement to use an effective contraceptive method during the study from enrollment until 2 weeks after the administration of study drug. * Signed, written, IRB-approved informed consent. Exclusion Criteria: * Large resected area (estimated total area \> 50 cm²) or suspected deep resection, even in the absence of signs of perforation beyond the muscularis propria or ongoing significant bleeding. * Known or suspected bladder perforation during TURBT. * Failure to completely resect all cancerous lesions or suspected presence of muscle-invasive cancer (Stage T2 or higher). * Previous diagnosis or current presence of bladder fibrosis/contracture, or total bladder capacity estimated at cystoscopy or by other means to be \< 150 mL. * Urinary incontinence or severe irritative voiding symptoms such as urgency, frequency, or nocturia of a severity that would compromise the ability of the patient to retain the study drug intravesical instillation for one hour. * Bladder cancer recurrence less than 3 months after a previous TURBT. * Major surgery, other than TURBT or diagnostic surgery, within 28 days prior to Day 1/Week 1. * Known active, uncontrolled bacterial, viral, or fungal infections, including urinary tract infection. * Any intravesical therapy within 3 months prior to Week 1/Day 1. * Systemic therapy including radiation therapy, surgery, chemotherapy, or investigational therapy within one month prior to Day 1/Week 1 (two months for nitrosoureas or MMC), unless given as standard treatment for bladder cancer and provided that patient is free of all treatment-related toxicities as of Day 1/Week 1. * Known infection with HIV. * Known active infection with hepatitis B or hepatitis C virus. * Serious disease (e.g., hydronephrosis, liver failure, or other conditions) that could compromise protocol objectives in the opinion of the Investigator and/or the Sponsor (Halozyme). * History of hypersensitivity or idiosyncratic reaction to, or other contraindication to, MMC. * Known allergy to bee or vespid venom. * Known coagulation disorder or bleeding tendency. * Ongoing treatment with heparin or other anticoagulation therapy, or anticipation of such therapy during the treatment period in this study. * Unwillingness or inability to comply with procedures required in this protocol.