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Hemophilia B clinical trials recruiting in the U.S.

12 studies for Hemophilia B are recruiting participants at sites across the United States.

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Recently updated studies

A Clinical Trial of Study Medicine (Marstacimab) in Pediatric Patients With Hemophilia A or Hemophilia B

RecruitingPhase 3
Ages 1 to 17 · Men · Updated Sep 23, 2026 · NCT05611801

SAFE Study: Safety of aPCC Following Emicizumab Prophylaxis

RecruitingPhase 3
Ages 6 and older · All sexes · Updated Aug 21, 2026 · NCT04563520

ATHN Transcends: A Natural History Study of Non-Neoplastic Hematologic Disorders

RecruitingObservational study
All ages · All sexes · Updated Aug 17, 2026 · NCT04398628

Open-Label Extension Study of Marstacimab in Hemophilia Participants With or Without Inhibitors

RecruitingPhase 3
Ages 1 to 74 · Men · Updated Jul 1, 2026 · NCT05145127

ATHNdataset Registry

RecruitingObservational study
All ages · All sexes · Updated Apr 21, 2026 · NCT06820515

An Observational Cohort Study to Characterize the Effectiveness and Safety of HEMGENIX® in Patients With Hemophilia B

RecruitingObservational study
Ages 18 and older · All sexes · Updated Feb 19, 2026 · NCT06008938

SEVENFACT® for Bleeding Events in Hemophilia With Inhibitors

RecruitingPhase 4
Ages 12 to 100 · All sexes · Updated Jan 12, 2026 · NCT04647227

From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.