Long-term Safety and Efficacy Study and Dose-Escalation Substudy of PF 06838435 in Individuals With Hemophilia B
Public ClinicalTrials.gov record NCT03307980. Field values are reproduced from the official study page; the official ClinicalTrials.gov record remains the source of truth for eligibility, enrollment, and contact information.
Data is sourced from official ClinicalTrials.gov public API records. Always review the official ClinicalTrials.gov record for the latest information.
Official title
A FACTOR IX (FIX) GENE TRANSFER, MULTI CENTER EVALUATION OF THE LONG TERM SAFETY AND EFFICACY STUDY OF PF 06838435 AND A DOSE ESCALATION SUBSTUDY IN INDIVIDUALS WITH HEMOPHILIA B
Study identification
- NCT ID
- NCT03307980
- Recruitment status
- Active, not recruiting
- Study type
- Interventional
- Phase
- Phase 2
- Lead sponsor
- Pfizer
- Industry
- Enrollment
- 21 participants
Conditions and interventions
Conditions
Interventions
- PF-06838435 (formerly SPK-9001) Biological
Biological
Eligibility (public fields only)
- Age range
- 18 Years to 65 Years
- Sex
- Male
- Healthy volunteers
- Healthy volunteers not accepted
This page does not interpret eligibility. Detailed inclusion and exclusion criteria are on the official ClinicalTrials.gov record.
Study timeline
- Start date
- Jun 21, 2017
- Primary completion
- May 28, 2029
- Completion
- Oct 24, 2029
- Last update posted
- May 4, 2026
2017 – 2029
United States locations
- U.S. sites
- 8
- U.S. states
- 5
- U.S. cities
- 5
| Facility | City | State | ZIP | Site status |
|---|---|---|---|---|
| UC Davis Ellison Ambulatory Care Clinic | Sacramento | California | 95817 | — |
| UC Davis Medical Center department of Radiology | Sacramento | California | 95817 | — |
| UC Davis Medical Center | Sacramento | California | 95817 | — |
| UC DavisHealth Main Hospital | Sacramento | California | 95817 | — |
| University Medical Center New Orleans | New Orleans | Louisiana | 70112 | — |
| Mississippi Center for Advanced Medicine | Madison | Mississippi | 39110 | — |
| Weill Cornell Medicine - New York Presbyterian Hospital | New York | New York | 10065 | — |
| The Children's Hospital of Philadelphia | Philadelphia | Pennsylvania | 19104 | — |
Site contact phone numbers, emails, and investigator names are intentionally not displayed here. Open the official ClinicalTrials.gov record for site contact information.
Non-U.S. locations
This page focuses on the U.S. directory. The official record also lists 4 non-U.S. sites.
About this trial record page
- What this page shows
- Public field values for ClinicalTrials.gov record NCT03307980, including study identification, conditions, interventions, eligibility (age, sex, healthy volunteer), timeline, and U.S. site list.
- What this page does not do
- No medical advice, eligibility judgments, treatment recommendations, study quality scoring, or AI-generated medical summaries. No site contact phone numbers, emails, or investigator names.
- Where the data comes from
- Sourced from the official ClinicalTrials.gov public API. The official record is the source of truth.
- Last refresh
- Last update posted May 4, 2026 · Synced May 6, 2026
Related: full search, browse by condition, browse by drug or therapy, browse by sponsor, browse by U.S. city.
Open the official record
The complete protocol, eligibility criteria, and contact information for NCT03307980 live on ClinicalTrials.gov.