A Phase 2/3 Multicenter Trial Evaluating the Safety and Efficacy of ST-02 (Mucoadhesive Gemcitabine Suspension) on Ablation of Urothelial Carcinomas in the Upper Urinary Tract
The goal of this prospective clinical trial is to investigate the safety and efficacy of ST-02 (mucoadhesive gemcitabine suspension for pyelocaliceal instillation) to treat Upper Tract Urothelial Carcinoma (UTUC) in participants who have a low-grade tumor. The main questions this study aims to answer are: 1. Can ST-02 effectively eradicate UTUC by 3 months? 2. Is ST-02 safe for patients with UTUC? Participants in this study will receive ST-02, a new formulation with gemcitabine once weekly for six weeks. Gemcitabine is known to be an effective drug in treating urothelial carcinoma. This new formulation will be instilled directly into the upper urinary tract (renal pelvis) and will allow the chemotherapeutic to work locally for an extended period of time. The administration process will be retrograde (via a small catheter inserted up into the kidney, under anesthesia) or antegrade (via a nephrostomy, in the clinic) once weekly for six weeks. Safety and efficacy will be monitored for up to a year after the initial response assessment.
• Adult (≥ 18 years) male or female
• Primary or recurrent low-grade (LG), noninvasive (Ta) Upper Tract Urothelial Carcinoma (UTUC) in the renal pelvis, infundibulum, and/or calyces, based on ureteroscopy, biopsy and cytology performed within 8 weeks prior to the Screening Visit
• At least 1 measurable papillary tumor measuring 5-15 mm
• Low grade tumor(s) in the ipsilateral ureter. Every attempt should be made to ablate this tumor completely, but residual ipsilateral ureteral tumor is not an exclusion criterion.
• Prior fully ablated low grade bladder tumor(s), without the need for intravesical therapy except for single-dose chemotherapy
• A life expectancy of greater than 12 months
• No active untreated urinary tract infection (UTI) as confirmed by urine culture or urinalysis
• Women of Child bearing potential (WoCBP) and Males who have a WoCBP partner require a negative pregnancy test at the Screening visit and must use two acceptable contraceptives methods until six months post-treatment
• All sexually active males must agree to use a condom during intercourse, for at least 48 h after each instillation