Gene Therapy for Hemophilia B Patients Aged 12-18 Years Old

NCT ID: NCT05709288

Last Updated: 2025-02-21

Basic Information

• Recruitment Status: RECRUITING
• Clinical Phase: PHASE1
• Total Enrollment: 9 participants
• Study Classification: INTERVENTIONAL
• Study Start Date: 2023-03-23
• Study Completion Date: 2035-11-30

Brief Summary

This is a Phase 1, open- label, non- randomized, uncontrolled, single dose pilot study to evaluate the safety, tolerability and efficacy of a single intravenous infusion of BBM-H901 in hemophilia B subjects with ≤2IU/dl residual FIX levels and aged 12-18 years old. BBM-H901 is an adeno-associated viral (AAV) vector designed to drive expression of the human factor IX (hFIX) transgene and raise circulating levels of endogenous FIX.

Detailed Description

This is a Phase 1, open- label, non- randomized, uncontrolled, single dose pilot study to evaluate the safety, tolerability and efficacy of a single intravenous infusion of BBM-H901 in hemophilia B subjects with ≤2IU/dl residual FIX levels and aged 12-18 years old. BBM-H901 is an adeno-associated viral (AAV) vector designed to drive expression of the human factor IX (hFIX) transgene and raise circulating levels of endogenous FIX. Nine subjects will be enrolled and administered with single infusion of BBM-H901, an AAV at one dose level of 5x10'12 vg/Kg. Subjects and statutory guardian must provide informed consent and then undergo screening assessments up to 4-8weeks prior administration of BBM-H901. All subjects will undergo 52(+- 2) weeks safety observation and will be continuously followed up to evaluate long- term safety and efficacy of BBM-H901 up to ten years. The first subject will be dosed at 5x10'12 vg/Kg and undergo 8 weeks safety observation of which the data will undergo review by an independent safety committee.

Conditions

Hemophilia B

Study Design

• Allocation Method: NA
• Intervention Model: SINGLE_GROUP
• Primary Study Purpose: TREATMENT
• Blinding Strategy: NONE

Study Groups

BBM-H901 administration group

Subjects will be administered with single dose intravenous infusion of BBM-H901.

Group Type: EXPERIMENTAL

BBM-H901

Intervention Type: DRUG

Single dose intravenous infusion of BBM-H901, an adeno-associated viral (AAV) vector designed to drive expression of an hyper active human factor IX mutant(FIX Padua) transgene in liver. The dose of BBM-H901 is 5x10'12 vg/Kg.

Interventions

BBM-H901

Single dose intravenous infusion of BBM-H901, an adeno-associated viral (AAV) vector designed to drive expression of an hyper active human factor IX mutant(FIX Padua) transgene in liver. The dose of BBM-H901 is 5x10'12 vg/Kg.

Intervention Type: DRUG

Eligibility Criteria

Inclusion Criteria

1. Subjects and statutory guardian must be able to understand the purpose and risks of the study and provide signed and dated informed consent;

2. Be male and 12≤ age <18 years of age, body wight ≥ 50kg;

3. Have hemophilia B with ≤2 IU/dL (≤2 %) endogenous FIX activity levels as documented by a certified clinical laboratory at the time of screening. If the screening result is >2% due to insufficient washout from FIX protein product, then the severity of hemophilia B may be confirmed by documented historical evidence from a certified clinical laboratory demonstrating ≤2% FIX coagulant activity (FIX:C) ;

4. Had had ≥75 prior exposure days (EDs) to any recombinant and/or plasma-derived FIX protein products based on historical data from the subject's record/history;

5. With ≤ 1:4 neutralizing antibodies and ≤1:200 binding antibodies against BBM-H901 capsid;

6. Subjects with bleeding episode and/ or FIX agents infusion events within 12 weeks prior to screening;

7. Have no prior history of hypersensitivity or anaphylaxis associated with any FIX or IV immunoglobulin administration;

8. Have no measurable FIX inhibitor as assessed by laboratory; or documented no prior history of FIX inhibitor (family history of inhibitors will not exclude the subject) and no clinical signs or symptoms of decreased response to FIX administration;

9. Have acceptable laboratory values:

1. Hemoglobin ≥11 g/dL ;

2. Platelets ≥100,000 cells/μL;

3. AST, ALT ≤1.5x upper limit of normal at the testing laboratory;

4. Bilirubin ≤1.5x ULN ;

5. glomerular filtration rate eGFR ≥ 60ml/min.

10. For those subjects with sexual maturity, subject and statutory guardian must know that subjects must agree to use reliable barrier contraception until 52 weeks;

11. with good compliance to the schedule of visit and fill in the subject diary.

Exclusion Criteria

1. Hepatitis B surface antigen antibody (HBSAg-Ab) or HBV-DNA positive; hepatitis C antibody or HCV-RNA positive;

2. Currently on antiviral therapy for hepatitis B or C;

3. With coagulation disorders other than hemophilia B;

4. Had immunosuppressive therapy other than steroid and other suggested IST agents within 30 days prior to screening;

5. Had vaccine 30 days prior to screening or have scheduled vaccination plan during the study (up to 52 weeks);

6. Have significant underlying liver disease, as defined by a preexisting diagnosis of portal hypertension, splenomegaly, encephalopathy, etc; other liver conditions unsuitable to gene therapy judged by investigator;

7. Have surgery plan within 52 weeks after gene therapy;

8. Have history of chronic infection or high rish of infection that the Investigator considers to constitute an unacceptable risk;

9. Had participated in a previous gene therapy research trial within the last 52 weeks or in a clinical study with an investigational drug within the last 12 weeks;

10. Had any herb that may affect the liver function within 4 weeks prior to screening;

11. Have history of fatal bleeding episode, eg intracranial hemorrhage, etc;

12. Any concurrent clinically significant major disease or any other condition that, in the opinion of the Investigator, makes the subject unsuitable for participation in the study;

• Minimum Eligible Age: 12 Years
• Maximum Eligible Age: 18 Years
• Eligible Sex: MALE
• Accepts Healthy Volunteers: No

Sponsors

Institute of Hematology & Blood Diseases Hospital, China

OTHER

Sponsor Role: lead

Responsible Party

Responsibility Role: SPONSOR

Principal Investigators

Lei Zhang, MD

Role: PRINCIPAL_INVESTIGATOR

Insitute of haematology and blood diseases hospital, chinese academy of medical sciences

Locations

Institute of haematology and Blood diseases hospital

Tianjin, Tianjin Municipality, China

Site Status: RECRUITING

Countries

China

Central Contacts

Feng Xue, MD

Role: CONTACT

xuefeng@ihcams.ac.cn

+862223909240

Shuo Chen, BS

Role: CONTACT

Chenshuo@ihcams.ac.cn

+862223909009

Facility Contacts

Lei Zhang, MD

Role: primary

zhanglei1@ihcams.ac.cn

0862223909009

Feng Xue, MD

Role: backup

xuefeng@ihcams.ac.cn

+862223909240

Other Identifiers

IIT2022051

Identifier Type: -

Identifier Source: org_study_id