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Hemophilia B clinical trials in Seattle, WA

3 studies for Hemophilia B are looking for participants at sites in and around Seattle (within about 30 miles). Open a study to see who can join and how to contact the study team.

Recruiting for a study here? Feature it at the top of this page — $99 for 30 days →

Safety and Effectiveness of Giroctocogene Fitelparvovec or Fidanacogene Elaparvovec in Patients With Hemophilia A or B Respectively

RecruitingPhase 3
  • Washington Institute for Coagulation, Seattle
Ages 18 and older · Men · Updated Oct 2, 2026 · NCT05568719

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

RecruitingObservational study
  • Washington Center for Bleeding Disorders, Seattle
All ages · All sexes · Updated Aug 17, 2026 · NCT04398628

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

RecruitingPhase 3
  • Washington Institute for Coagulation d/b/a WACBD, Seattle
Ages 1 to 74 · Men · Updated Jul 1, 2026 · NCT05145127

Hemophilia B trials in other cities

Other studies in Seattle

From ClinicalTrials.gov, data retrieved Oct 5, 2026. Each study sets its own eligibility; the study team decides who can join.