Clinical Trial

Disease: Haemophilia B, (NCT02695160)

Disease info:

Haemophilia B is a bleeding disorder that slows the blood clotting process. People with this disorder experience prolonged bleeding or oozing following an injury or surgery. In severe cases of hemophilia, heavy bleeding occurs after minor injury or even in the absence of injury. Serious complications can result from bleeding into the joints, muscles, brain, or other internal organs. Milder forms may not become apparent until abnormal bleeding occurs following surgery or a serious injury. Hemophilia B is caused by mutations in the F9 gene which encodes coagulation factor IX.

Hemophilia primarily affects males, but a milder, symptomatic form of hemophilia B in female carriers has also been described.


Prevalence is estimated at around 1 in 30,000 males.
Official title:
A Phase I, Open-Label, Ascending Dose Study to Assess the Safety and Tolerability of AAV2/6 Factor IX Gene Therapy Via Zinc Finger Nuclease (ZFN) Mediated Targeted Integration of SB-FIX in Adult Subjects With Severe Hemophilia B

United States, District of Columbia

Georgetown University Medical Center, Washington, District of Columbia, United States, 20007

Study start:
Nov. 15, 2016
1 participant
Gene editing method:
ZFN- Zinc Finger Nucleases
Type of edit:
Gene insertion
F9 (Coagulation Factor IX)
Delivery method:
Adeno-associated virus (AAV2/6) - In-vivo
IND Enabling Pre-clinical
Phase I Safety
Phase II Safety and Dosing
Phase III Safety and Efficacy

Status: Terminated


The objective of the study is to provide long term expression of Factor IX in subjects with severe haemophilia B. SB-FIX is a therapeutic for ZFN-mediated genome editing which will be delivered by adeno-associated virus (AAV)-derived vectors. SB-FIX is intended to function by placement of a corrective copy of the Factor IX transgene into the genome of the subject's own hepatocytes, under the control of the highly expressed endogenous albumin locus, and is expected to provide permanent, liver-specific expression of Factor IX for the lifetime of a hemophilia B subject.

The purpose of the study is to evaluate the safety, tolerability and effect on FIX antigen and activity levels of ascending doses of SB-FIX. SB-FIX is an intravenously delivered Zinc Finger Nuclease (ZFN) Therapeutic for genome editing. It inserts a correct copy of the Factor 9 gene into the albumin locus in hepatocytes with the goal of lifelong therapeutic production of the Factor IX clotting factor.

Last updated: Dec. 28, 2023
Search CRISPR Medicine