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This study looked at the safety of delivering a normal factor IX gene, using the scAAV2/8-LP1-hFIXco vector, to people with an abnormal or missing factor IX gene. The Phase 1 trial enrolled men aged 18 and over with confirmed severe hemophilia B who had used factor IX products for at least 10 years and had an average of at least 3 bleeding episodes per year. People with active hepatitis or anti-hFIX antibodies were not eligible.
The summary above is a plain-language rendering of the official record. The original English title is shown for reference.
Criteria are reproduced from the ClinicalTrials.gov record in the original English. Only the trial team can determine eligibility.
Inclusion Criteria: * Males ≥ 18 years of age with established severe HB (FIX:C\<1u/dl), * Treated/exposed to FIX products (e.g., concentrates or fresh frozen plasma) for at least 10 years or 50 exposure days. * A minimum of an average of 3 bleeding episodes per year requiring FIX infusions or prophylactic FIX infusions because of frequent prior bleeding episodes * Able to give informed consent and comply with requirements of the trial * Currently free of inhibitor and have no history of inhibitors to FIX protein * A negative family history for the development of an inhibitor, * Willing to practice a reliable barrier method of contraception until 3 sequential samples are negative for vector genomes using our PCR assay. Exclusion Criteria: * Evidence of active infection with Hepatitis B or C virus as reflected by HBsAg or NCV RNA positivity, respectively. To be considered negative for active infection, two negative assays at a minimum of a six month interval are required. * Exposure to Hepatitis B or C who are currently on antiviral therapy. * Serological evidence of HTLV or active HIV infection. Individuals who are effectively being treated with antiretroviral therapy are eligible. Specific criteria for effectiveness of treatment include the following: * Documented CD4+ T-cell count of \> 350 cells/mm\^3. * HIV-1 RNA viral load \< 400 copy/ml for at least the past 12 months, including at least 2 viral load test results of \< 400 copy/ml during the immediate 12 month interval prior to screening. * Screening HIV-RNA viral load \< 400 copies/ml. * Stable HAART regimen (drugs of at least 2 different classes) for at least 12 months prior to study entry. Treatment regimen changes for dosing convenience and in response to toxicity are permitted. * Documented and confirmed (repeated) viral loads of ≥ 400 copies/ml during the 12 month time interval prior to screening are bases for exclusion although a single, unconfirmed, "glimpse" of ≥ 400 copies/ml are permitted. * Significant liver dysfunction as defined by an abnormal ALT (alanine transaminase), bilirubin, alkaline phosphatase or INR. Potential participants who have had a liver biopsy in the past 3 years will be excluded if they have significant fibrosis of 3 or 4 as rated on a scale of 0-4. * Coronary artery disease as a co-morbid condition * Platelet count of \<50 x 10\^9/l * Creatinine ≥ 1.5 mg/dl * Hypertension with systolic blood pressure (BP) ≥ 140 mmHg or diastolic BP ≥ 90 mmHg * History of active tuberculosis, fungal disease or other chronic infection * History of chronic disease that would adversely affect performance other than hemophilic arthropathy * Detectable antibodies reactive with AAV8 * Subjects who are unwilling to provide the required semen samples * Poor performance status (WHO performance status score \>1) or * Received an AAV vector or any other gene transfer agent in the previous 6 months * Presence of lung nodule(s) suspicious of malignancy on screening chest tomography * Presence of liver abnormalities suspicious of malignancy on screening liver ultrasound