Clinical trials · California
Hemophilia B clinical trials in California
We’re tracking 8 recruiting hemophilia b studies with a site in California — including Phase 1, Phase 1/Phase 2, Phase 3 and Phase 4 studies, each written for real people, not researchers.
Recruiting studies in California
- NCT07080905RecruitingPhase 3
Gene therapy for teens with severe hemophilia B
This trial tests a single dose of CSL222, a gene therapy, in adolescent boys with severe or moderately severe hemophilia B. The goal is to see if it can reduce or eliminate the need for regular factor IX infusions.
Orange, CaliforniaAges 11.5 years–17.2 years - NCT06379789RecruitingPhase 1/Phase 2
Gene therapy for severe hemophilia B
This trial tests a new gene therapy (REGV131-LNP1265) that aims to let your body produce its own factor IX, reducing or stopping the need for regular infusions. It is for children and adults with severe hemophilia B who are already using factor IX replacement therapy.
Los Angeles, CaliforniaAges 2 years+ - NCT05568719RecruitingPhase 3
Testing gene therapy for hemophilia A or B
This Phase 3 trial is checking how safe and effective two gene therapies are for people with hemophilia A or hemophilia B. It only includes people who already received the study medicines through specific Pfizer studies, so it’s mainly for that existing participant group.
Rancho Cordova, CaliforniaAges 18 years+ - NCT06349473RecruitingPhase 1
Study of SR604 in healthy people and those with bleeding disorders
This study tests a new drug called SR604 to see if it is safe and how it works in the body. It is for healthy men and for people with hemophilia A, hemophilia B, or factor VII deficiency who have frequent bleeding or are on preventive treatment.
Glendale, CaliforniaAges 18–60 - NCT05962398Enrolling by invitation
Follow-up study for men previously treated with CSL222
This study checks long-term safety and outcomes in men with hemophilia B who previously received CSL222. It may help your care team better understand how well the treatment lasts over many years.
Los Angeles, CaliforniaAges 18 years+ - NCT06003387RecruitingPhase 3
Gene therapy for hemophilia B with AAV5 antibodies
This trial tests a gene therapy called CSL222 for adults with hemophilia B who have antibodies against the AAV5 virus used to deliver the therapy. It aims to see if the treatment is safe and effective even when these antibodies are present.
San Diego, CaliforniaAges 18 years+ - NCT07285460RecruitingPhase 3
Fitusiran for young boys with hemophilia A or B
This trial tests if fitusiran, given as a shot, can help prevent bleeding in boys ages 1 to 12 with severe hemophilia (factor VIII under 1% or factor IX at 2% or lower). It includes boys with or without inhibitors and aims to understand safety and how well it works.
Los Angeles, CaliforniaAges 1–11 - NCT04647227RecruitingPhase 4
SEVENFACT® to reduce bleeding in hemophilia with inhibitors
This trial studies whether SEVENFACT® can reduce bleeding episodes in people with hemophilia A or B who have inhibitors (proteins that make standard treatments less effective). It also tests how well people can track bleeding and medicine use during the study.
Los Angeles, CaliforniaAges 12–100
Hemophilia B trials by city in California
Where these studies are running in California
Institutions with a site for the recruiting hemophilia b studies listed above.
- Children's Hospital Los Angeles · 3 studies
- Orthopaedic Institute for Children · 3 studies
- University of California, Davis Medical Center · 3 studies
- UC Davis Health · 2 studies
- University of California San Diego · 2 studies
- California Clinical Trials Medical Group
- Center for Inherited Blood Disorders
- Orthopaedic Hemophilia Treatment Center
What taking part in a hemophilia b study involves
A screening visit first
Before anything else, the study team checks whether you fit — usually a visit with some tests. You can stop at any point, and screening is typically free.
Care at a nearby site
Study visits happen at a clinic or hospital taking part. Many studies cover the cost of the study treatment and related visits, and some reimburse travel.
You stay in control
Taking part is voluntary and you can leave a study at any time, for any reason, without affecting your regular care.
The team decides eligibility
Our fit check is a helpful first read, not a decision. The study team makes the final call after reviewing your health history.
Hemophilia B trials in other states
Common questions
- Are there hemophilia b clinical trials in California?
- Yes. We're currently tracking 8 recruiting hemophilia b studies with a site in California, each rewritten in plain language so you can see what it's testing and who it's for.
- How do I find out if I qualify for a hemophilia b study in California?
- Each study lists its eligibility rules — age, diagnosis, prior treatments. On every trial page we explain these in plain language and offer a short, optional pre-screen for a fit read. The study team makes the final decision.
- Do I have to live in California to take part?
- Not necessarily. These studies have a site in California, but eligibility is about your health, not your address — some people travel to take part, and a few studies reimburse travel. The study team can tell you what's required.
- Does it cost anything to join a hemophilia b trial?
- Using Clin2 is always free. Many trials cover the study treatment and related visits; some reimburse travel. The study team explains exactly what's covered before you decide.
Not the right time?
New hemophilia b studies open in California regularly. Set up a health profile and we’ll quietly watch for studies that fit you and email you when one opens.
Clin2 helps you find and understand clinical trials and does not provide medical advice. Study data comes from ClinicalTrials.gov. Talk with your doctor about whether a specific trial is right for you.