A Study of Intravesical Apaziquone as a Surgical Adjuvant in Participant Undergoing Transurethral Resection Bladder Tumor (TURBT)

This is a Phase 3, randomized, multicenter, multi-arm, placebo-controlled, double-blind study of apaziquone in participants with ≤4 non-muscle invasive bladder tumors, ≤3.5 cm in diameter, all of which must have been fully resected at TURBT. In addition to Screening, participants underwent an assessment of urothelial carcinoma of the bladder via cystoscopy for clinically apparent tumor Ta, G1-G2. Following TURBT on Day 1, eligible participants were randomized to one of three treatment arms in a 1:1:1 ratio : Arm 1 : One Dose of Apaziquone: * Day 1: administration of 4 mg of apaziquone 60±30 minutes post-TURBT * Day 15 (±5 days): administration of placebo Arm 2 : Two Doses of Apaziquone : * Day 1: administration of 4 mg of apaziquone 60±30 minutes post-TURBT * Day 15 (±5 days): administration of 4 mg of apaziquone Arm 3: Placebo : * Day 1 : administration of placebo 60±30 minutes post-TURBT * Day 15 (±5 days) : administration of placebo Once randomized, Day 1 study drug instillation occurred 60 ±30 minutes post TURBT. Participants returned on Day 15 (±5 days) for a second instillation unless their pathology results showed non Ta, G1-G2 histology; in the absence of local pathology results by the Day 15 visit, participants received a second instillation of study drug. All histology specimens were reviewed by a local pathology laboratory and all clinical treatment decisions and study analyses were based on the local pathology review. Participants whose pathology was other than Ta, G1-G2 were followed for safety at Day 35 (±5 days) from the last dose of study drug and then discontinued from the study. Participants with pathology confirmed Ta, G1-G2 disease were followed according to the schedule below : * Cystoscopic examination and urine cytology every 90 days (±10 days) (calculated from date of TURBT) through 24 months for tumor recurrence and progression. * If at any time during the 24 months follow up period there was a tumor recurrence, the participant continued on study with follow-up cystoscopic examination and urine cytology every 90 days (±10 days) (calculated from date of TURBT) through the end of 24 months. Participants with a recurrence were permitted to have a follow-up TURBT. * If at any time during the 24 months follow up period there was a tumor recurrence and/or participant started on another therapy, the participant was followed by telephone, for safety every 90 days (±10 days) (calculated from date of TURBT) through the end of 24 months. Duration of Study: The duration of the study for each participant was approximately 24 months including: * Screening Period : 30-days * Treatment Period : Day 1 and Day 15 (±5 days) * Safety and Follow-up Period: 24-months