A Study of HS-10566 in Patients With High-risk Non-muscle-invasive Bladder Cancer Who Are Ineligible for or Refuse Radical Cystectomy

NCT07468851 | Not Yet Recruiting Phase 1

• 1 other identifier: HS-10566-101
• Study Type: interventional
• Target: 180
• Locations: 1 country
• Sites: 2

Brief Summary

This is a multicenter, open-label, Phase I/II clinical study evaluating the safety, efficacy, tolerability, and pharmacokinetic/pharmacodynamic (PK/PD) profiles of HS-10566 in patients with high-risk non-muscle-invasive bladder cancer who are ineligible for or refuse radical cystectomy. The study comprises two distinct phases: a dose exploration phase and a proof-of-concept phase.

Conditions

High-risk Non-muscle-invasive Bladder Cancer

Keywords

High-risk Non-muscle-invasive Bladder Neoplasms Administration, Intravesical

Outcome Measures

Primary Outcomes (4)

• Phase I: RP2D

  Up to 5 months

• Phase II Arm 1: overall complete response (CR) rate

  Overall CR rate is defined as the percentage of participants achieving a CR at any time post-treatment. It will be measured by determining the percentage of participants without presence of high-grade disease using results from cystoscopy and centrally read urine cytology at any time point.

  Up to 36 months

• Phase II Arm 2: disease-free survival (DFS)

  DFS will be measured as the time from the date of first dose of study treatment to either the time of the first recurrence of high-risk disease, progression, or death due to any cause, whichever occurs first.

  Up to 36 months

• Phase II Arm 3: event-free survival (EFS)

  EFS will be measured as the time from the date of first dose of study treatment to either the time of the persistence of CIS after 6 months, the first recurrence of high-risk disease, progression, or death due to any cause, whichever occurs first.

  Up to 36 months

Secondary Outcomes (6)

• Phase I: Incidence and severity of treatment-emergent adverse events

  Up to 36 months

• Concentrations of Gemcitabine and 2',2' difluorodeoxyuridine (dFdU) in Urine and Plasma

  up to 2 months

• Phase I and Phase II Arm 3: overall complete response (CR) rate

  Up to 36 months

• Phase I and Phase II Arm 1 and Arm 3: duration of CR (DoR)

  Up to 36 months

• Phase I: disease-free survival (DFS)

  Up to 36 months

Study Arms (3)

Arm 1:Bacillus Calmette-Guerin (BCG)-unresponsive participants with carcinoma in situ.

EXPERIMENTAL

HS-10566 is placed into the bladder through a urinary placement catheter in participants with CIS, with or without papillary disease, on Day 1 and will be dosed Q4W for up to the first 24 weeks (6 months), then every 12 weeks through Week 96 (Year 2).

Drug: HS-10566

Arm 2: BCG-unresponsive participants with high-risk papillary-only disease

EXPERIMENTAL

HS-10566 is placed into the bladder through a urinary placement catheter in participants with papillary disease only, on Day 1 and will be dosed Q4W for up to the first 24 weeks (6 months), then every 12 weeks through Week 96 (Year 2).

Drug: HS-10566

Arm 3: BCG-naïve participants with high-risk disease

EXPERIMENTAL

HS-10566 is placed into the bladder through a urinary placement catheter in participants with BCG-naïve high-risk disease, on Day 1 and will be dosed Q4W for up to the first 24 weeks (6 months), then every 12 weeks through Week 96 (Year 2).

Drug: HS-10566

Interventions

HS-10566 DRUG

HS-10566 is an intravesical gemcitabine delivery system available in two drug-loaded strengths: 0.3 g gemcitabine and 0.6 g gemcitabine.

Arm 1:Bacillus Calmette-Guerin (BCG)-unresponsive participants with carcinoma in situ.

Eligibility Criteria

• Age: 18 Years+
• Sex: all
• Healthy Volunteers: No
• Age Groups: Adult (18-64), Older Adult (65+)

You may qualify if:

• Men or women aged greater than or equal to (≥) 18 years.
• Signed informed consent form.
• Histologically confirmed non-muscle-invasive bladder urothelial carcinoma (i.e., transitional cell carcinoma). Mixed tumor types predominantly consisting of urothelial carcinoma are eligible. Patients diagnosed with neuroendocrine, micropapillary, signet-ring cell, plasmacytoid, or sarcomatoid features are excluded.
• Patients with non-muscle-invasive bladder cancer (NMIBC) who have undergone prior transurethral resection of bladder tumor (TURBT) and who refuse or are ineligible for radical cystectomy, and meet one of the following two populations:
• Patients with high-risk non-muscle-invasive bladder cancer (HR-NMIBC) who are unresponsive to Bacillus Calmette-Guérin (BCG) therapy after prior TURBT, and who refuse or are ineligible for radical cystectomy. BCG unresponsive is defined as occurrence of any one of the following in NMIBC patients after adequate BCG therapy (at least 5 full dose inductions and at least 2 maintenance instillations of BCG):
• Persistent or recurrent CIS within 12 months after adequate BCG therapy, with or without recurrence of high-grade Ta or T1 tumors;
• Recurrence of high-grade Ta/T1 tumors within 6 months after adequate BCG therapy (disease-free);
• Recurrence of high-grade tumors at the first assessment during maintenance therapy after adequate BCG induction.
• Patients who have not received BCG therapy after prior TURBT, including the following three scenarios:
• NMIBC patients who failed intravesical chemotherapy, and who refuse or are ineligible for repeat postoperative intravesical chemotherapy or BCG instillation by the investigator.
• HR-NMIBC patients who have not received BCG therapy after TURBT, and who refuse or are ineligible for BCG instillation as determined by the investigator. Ineligibility for BCG includes, but is not limited to: active tuberculosis, severe hematuria, recent traumatic catheterization, symptomatic urinary tract infection, immunodeficiency or impairment (e.g., AIDS, patients receiving immunosuppressants or radiotherapy), BCG hypersensitivity, etc.
• HR-NMIBC patients who received prior BCG therapy but discontinued treatment for more than 3 years before enrollment.
• Participants must have undergone TURBT within 12 weeks prior to signing informed consent and meet the following criteria:
• For papillary lesions (Ta and T1 stages): complete resection of all visible papillary lesions, with negative urine cytology (including atypical findings).
• For patients with CIS: residual unresectable CIS lesions are permitted.

You may not qualify if:

• Histopathologically confirmed muscle invasive (pathologic T stage ≥ T2), locally advanced, unresectable, or metastatic urothelial carcinoma.
• Urothelial carcinoma outside the bladder (e.g., urethra, ureter, renal pelvis) unless radically resected with no disease recurrence for \> 2 years.
• History of other primary solid tumors, except:
• Radically treated solid tumor with no activity for ≥5 years before enrollment and low recurrence risk;
• adequately treated non-melanoma skin cancer (e.g., basal cell carcinoma, squamous cell carcinoma) or lentigo maligna with no evidence of recurrence;
• adequately treated carcinoma in situ (e.g., cervical, ductal carcinoma in situ of breast) with no evidence of recurrence.
• Has received or is receiving any of the following treatments:
• Regular intravesical chemotherapy (gemcitabine, pirarubicin, mitomycin, etc.) or BCG instillation intolerance following TURBT/bladder biopsy before enrollment.
• Pelvic radiotherapy within 4 weeks prior to first study treatment. Patients with last radiotherapy \>4 weeks prior and no confirmed radiation cystitis may be enrolled.
• Major surgery (TURBT is not considered major surgery) within 4 weeks before first study treatment, or incomplete recovery from postoperative complications.
• Systemic chemotherapy, small-molecule targeted therapy, or investigational therapy within 4 weeks before first study treatment.
• Residual toxicity ≥ Grade 2 per CTCAE version 6.0 from prior therapy (surgery, intravesical instillation, etc.), except alopecia, pigmentation.
• Bladder or urethral anatomical features that may interfere with HS-10566 implantation, retention, or removal (e.g., urethral stricture, bladder diverticulum, total urinary incontinence, bladder perforation).
• Current or history of clinically significant polyuria (24-hour urine output \>4000 mL).
• Requirement for long-term indwelling urinary catheter during study treatment (e.g., urinary obstruction).

Sponsors & Collaborators

• Jiangsu Hansoh Pharmaceutical Co., Ltd.: lead

Study Sites (2)

Peking University First Hospital

Beijing, 100034, China

Location

Nanjing Drum Tower Hospital

Nanjing, 210008, China

Location

Central Study Contacts

Zhisong HE, M.D(Doctor of Medicine)

CONTACT

(+86) 13910688432; wyj7074@sohu.com

Hongqian GUO, M.D(Doctor of Medicine)

CONTACT

(+86) 025 83106666; gymwpi@126.com

Study Design

• Study Type: interventional
• Phase: phase 1
• Allocation: NON RANDOMIZED
• Masking: NONE
• Purpose: TREATMENT
• Intervention Model: PARALLEL
• Sponsor Type: INDUSTRY
• Responsible Party: SPONSOR

Study Record Dates

• First Submitted: March 8, 2026
• First Posted: March 13, 2026
• Study Start: June 10, 2026
• Primary Completion (Estimated): April 30, 2028
• Study Completion (Estimated): April 30, 2029
• Last Updated: March 13, 2026

Record last verified: 2026-03

Locations

CN (2)