Updated May 2026 · ClinicalTrials.gov

RECRUITINGPhase 2 / Phase 3INTERVENTIONAL

Evaluation of the Safety and Efficacy of Hemophilia A Gene Therapy Drugs

A Phase 1/2/3 Open-label Study to Evaluate the Safety, Tolerability and Efficacy of an Adeno-associated Viral Vector Containing an Expression Cassette of the Human Factor VIII Transgene (BBM-H803) Injection in Participants With Hemophilia A

Evaluation of the Safety and Efficacy of Hemophilia A Gene Therapy Drugs (NCT06111638) is a Phase 2 / Phase 3 interventional studying Hemophilia A, sponsored by Shanghai Xinzhi BioMed Co., Ltd.. RECRUITING as of the most recent ClinicalTrials.gov update. Talk to your doctor before contacting the trial site.

About This Trial

This is a multi-center, Phase 1/2/3, single-arm, open-label, single-dose treatment clinical study to evaluate the safety, tolerability and efficacy of BBM-H803 injection in severe Hemophilia A subjects. BBM-H803 is an adeno-associated viral (AAV) vector derived from recombinant DNA techniques to contain an expression cassette of the human factor VIII transgene and raises circulating levels of endogenous FVIII.

What Stage of Research Is This?

Phase 2 trials evaluate whether a treatment actually works against Hemophilia A and continue monitoring side effects. Phase 2 enrolls larger groups (typically 100–300 patients) and produces the first real efficacy signal. A successful Phase 2 readout is what unlocks the much larger Phase 3 confirmatory trials needed for FDA approval.

This trial is currently recruiting participants. The sponsor has registered the study with ClinicalTrials.gov as actively enrolling, which means new applicants who meet the eligibility criteria can be considered for screening. Trial status can change between updates — confirm current recruiting status with the study contact before traveling for a screening visit.

Target enrollment of 55 participants puts this in the typical range for a Phase 2-style efficacy study or a moderate Phase 3 trial in a focused Hemophilia A subpopulation. At this scale, the study has enough statistical power to detect a clear treatment effect but is not the largest cohort in the field.

Who May Be Eligible (Plain English)

Inclusion Criteria of Phase 1/2/3: 1. Subjects voluntarily sign willing to sign a consent form form; 2. Males ≥ 18 years; 3. Subjects are clinically diagnosed with severe hemophilia A; 4. Have \> = 150 documented exposure days to a Factor VIII protein product 5. No prior history of hypersensitivity or anaphylaxis associated with any FVIII immunoglobulin; 6. Use a reliable contraception method during the study; 7. Capsid antibody negative; 8. Subjects have good compliance. Exclusion Criteria of Phase 1/2/3: 1. Being positive for hepatitis B surface antigen (HBsAg) or hepatitis B virus-DNA (HBV-DNA). Being positive for hepatitis C virus antibody (HCV-Ab) or hepatitis C virus RNA (HCV-RNA). Subjects with medical history of hepatitis B or C can be regarded as negative only when 2 required samplings are conducted at least 3 months apart and both test results of indicators aforementioned are negative, HIV positive patients or Syphilis seropositive patients; 2. Currently on antiviral therapy for hepatitis B or C; 3. Suffer from coagulation disorders other than hemophilia A; 4. In addition to glucocorticoids, any other immunosuppressants are being used before selection; 5. Have vaccination history within 2 months before administration, or vaccination schedule during immunomodulatory therapy; 6. Have potential liver diseases, such as previous diagnosis of portal hypertension, splenomegaly, hepatic encephalopathy or liver fibrosis (fibrosis stage ≥ 3); nodules or cysts were found by B ultrasound, or elevated alpha-fetoprotein was detected by laboratory tests. Subjects who are not eligible for the study if the abnormalities are clinically significant regarding to the medical judgement of the investigator; 7. Scheduling of elective major surgery known or planned during the insertion period or the 52-week study period following BBM-H803 infusion; ...See full criteria on ClinicalTrials.gov Always talk to your doctor about whether this trial is right for you.

These are translations of the protocol\'s inclusion and exclusion criteria, simplified for patients and caregivers. The original clinical text appears below. Eligibility is ultimately confirmed by the trial site\'s screening process — this summary is a starting point for a conversation with your doctor, not a final determination.

Original Eligibility Criteria

View original clinical language

Inclusion Criteria of Phase 1/2/3: 1. Subjects voluntarily sign informed consent form; 2. Males ≥ 18 years; 3. Subjects are clinically diagnosed with severe hemophilia A; 4. Have \> = 150 documented exposure days to a Factor VIII protein product 5. No prior history of hypersensitivity or anaphylaxis associated with any FVIII immunoglobulin; 6. Use a reliable contraception method during the study; 7. Capsid antibody negative; 8. Subjects have good compliance. Exclusion Criteria of Phase 1/2/3: 1. Being positive for hepatitis B surface antigen (HBsAg) or hepatitis B virus-DNA (HBV-DNA). Being positive for hepatitis C virus antibody (HCV-Ab) or hepatitis C virus RNA (HCV-RNA). Subjects with medical history of hepatitis B or C can be regarded as negative only when 2 required samplings are conducted at least 3 months apart and both test results of indicators aforementioned are negative, HIV positive patients or Syphilis seropositive patients; 2. Currently on antiviral therapy for hepatitis B or C; 3. Suffer from coagulation disorders other than hemophilia A; 4. In addition to glucocorticoids, any other immunosuppressants are being used before selection; 5. Have vaccination history within 2 months before administration, or vaccination schedule during immunomodulatory therapy; 6. Have potential liver diseases, such as previous diagnosis of portal hypertension, splenomegaly, hepatic encephalopathy or liver fibrosis (fibrosis stage ≥ 3); nodules or cysts were found by B ultrasound, or elevated alpha-fetoprotein was detected by laboratory tests. Subjects who are not eligible for the study if the abnormalities are clinically significant regarding to the medical judgement of the investigator; 7. Scheduling of elective major surgery known or planned during the insertion period or the 52-week study period following BBM-H803 infusion; 8. Have participated in a previous gene therapy research trial before screening or have used other test drugs within 4 weeks before screening, or within 5 half-life of the test drug, whichever is longer; Have received emesezumab within 6 months before screening; Or drugs evaluated by the researcher to affect the study; 9. Any herbal preparations (herbal supplements or traditional Chinese medicines of plant, mineral or animal origin) used during the 4 weeks prior to or during the study that may affect liver function, except topical use; Or any Chinese herbal medicine that the researcher evaluates to affect the study; 10. Have alcohol or drug addiction, or cannot stop drinking as advised by the researcher throughout the study; 11. Have acute/chronic infections or other chronic diseases that may pose a risk for the study, or have a major illness, who have a current or previous history of malignant tumors, or who have other unstable medical conditions, including poor mental state and risk of suicide, that the investigator deems unsuitable for participation in the study; 12. Any other conditions that the investigator deems unsuitable for participation in the study.

Treatments Being Tested

GENETIC

Single dose intravenous injection of BBM-H803

Single dose intravenous infusion of BBM-H803, an adeno-associated viral (AAV) vector derived from recombinant DNA techniques to contain an expression cassette of the human factor VIII transgene in liver. The dose of BBM-H803 will be calculated according to participant's weight.

Locations (10)

Trial sites listed on ClinicalTrials.gov for this study. Site activation status can vary — confirm with the specific site before traveling for a screening visit.

Peking Union Medical College Hospital, Chinese Academy of Medical Sciences

Beijing, Beijing Municipality, China

Southern Hospital, Southern Medical University

Guangzhou, Guangdong, China

Affiliated Hospital of Guizhou Medical University

Guiyang, Guizhou, China

Wuhan Union Hospital Affiliated to Huazhong University of Science and Technology

Wuhan, Hubei, China

Xiangya Hospital Central South University

Changsha, Hunan, China

The First Affiliated Hospital of Soochow University

Suzhou, Jiangsu, China

The Affiliated Hospital of Northwest University Xi'an No.3 Hospital

Xi’an, Shanxi, China

Sichuan Provincial People's Hospital

Chengde, Sichuan, China

Institute of Hematology & Blood Diseases Hospital Chinese Academy of Medical Sciences & Peking Union Medical College

Tianjin, Tianjin Municipality, China

The Second Affiliated Hospital of Kunming Medical University

Kunming, Yunnan, China

How to Talk to Your Doctor About This Trial

Bring the printable summary of this trial — including the NCT ID (NCT06111638), the sponsor (Shanghai Xinzhi BioMed Co., Ltd.), and the key eligibility criteria — to your next appointment. Your doctor can review the inclusion and exclusion criteria against your medical history, lab values, and current treatments to assess whether you are likely to qualify. They can also help you weigh whether trial participation makes sense alongside your existing care plan.

Useful questions to walk through together: What does the trial protocol require beyond standard care? How long is the active treatment phase, and how long is follow-up? Are there study visits at sites I can reach? Who pays for the trial-specific procedures, and who pays for standard-of-care portions? See our 25 questions to ask about clinical trials guide for a more complete checklist.

Authoritative Sources

The official record for this trial lives on ClinicalTrials.gov — the federal registry maintained by the National Library of Medicine at NIH. For background on how this trial fits into the FDA approval pathway, see the FDA drug approval process. For oncology-specific guidance for patients considering trials, the National Cancer Institute publishes patient-oriented overviews. International trial registries are aggregated by the WHO ICTRP.

Frequently Asked Questions

What is the NCT06111638 clinical trial studying?

Who can participate in NCT06111638?

Eligibility for this trial depends on the specific inclusion and exclusion criteria set by the sponsor. The plain-English summary above translates the most important criteria into accessible language; the official clinical text is preserved in the collapsible section underneath. Whether you fit any specific trial is a medical decision your doctor needs to confirm — bring the trial information to your treating physician for a full review against your medical history.

How do I contact the trial site for NCT06111638?

Contact information registered with ClinicalTrials.gov is shown in the sidebar of this page. Before reaching out, confirm with your treating physician that this trial is appropriate for your situation. The trial site will then walk you through the screening process to determine final eligibility.

Is participating in a clinical trial safe?

Clinical trials in the United States are regulated by the FDA and overseen by Institutional Review Boards (IRBs) that review the protocol for safety. Risk varies by trial — Phase 1 studies test new treatments in humans for the first time, while Phase 3 trials use treatments that have already passed earlier safety screening. The informed consent document for any specific trial details the known risks and what to expect. Discuss those risks with your physician before deciding whether to participate.

Where can I verify the data on this page?

Every detail on this page comes directly from the ClinicalTrials.gov API. Click "View on ClinicalTrials.gov" in the sidebar to see the official, unmodified record. The federal record is always authoritative; this page is a structured presentation with a plain-English eligibility translation. For background on how clinical trials are regulated, see the FDA drug approval process documentation.

How This Page Is Built

Every field on this page is pulled directly from the ClinicalTrials.gov API v2 — no estimates, no proxies. The plain-English eligibility translation is generated from the original protocol text and reviewed for fidelity to the underlying clinical criteria. The original clinical text remains visible in the collapsible section above so users and clinicians can verify the translation. Read the full methodology for the data pipeline and known limitations.

Source: ClinicalTrials.gov API v2 record for NCT06111638. Maintained by the National Library of Medicine at NIH. Public domain. Cite as: "TrialFinderData. NCT06111638. Data: ClinicalTrials.gov."

Medical disclaimer: This page is informational, not medical advice. Talk to your doctor about whether a clinical trial is right for you.

Last updated 2026-05-08 · Data from ClinicalTrials.gov.