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A Global, Open-label Study to Investigate the Efficacy and Safety of SerpinPC in Subjects With Hemophilia B With Inhibitors (PRESent-3)
EU CTIS ID: 2022-502881-25-00
What this study is testing
To evaluate the efficacy and safety of prophylactic SerpinPC administered subcutaneously in subjects with hemophilia B (HemB) with inhibitors
- Therapeutic exploratory (Phase II)
A plain-language read of the study's public EU CTIS listing. The study team confirms the details.
Who can take part
You may be able to join if
- Male subjects ≥12 and ≤65 years of age at the time of informed consent
- Adequate hematologic function, defined as a platelet count of ≥100,000/μL (≥100 × 109/L) and hemoglobin level of ≥10 g/dL (≥100 g/L or ≥ 6.206 mmol/L) at Screening and Pre-dosing visits
- Adequate hepatic function, defined as a total bilirubin level of ≤1.5 × upper level of normal (ULN, excluding Gilbert syndrome) and aspartate aminotransferase and/or alanine aminotransferase of ≤3 × ULN at Screening and Pre-dosing visits; no clinical signs or known laboratory or radiographic evidence consistent with cirrhosis of the liver
- Adequate renal function, defined as a serum creatinine level of ≤2.0 × ULN at Screening and Pre-dosing visits
- Able to use a diary to document bleeding events and medication usage (caregiver assistance allowed for adolescents)
- Sexually active subjects with a partner who could become pregnant should agree to use effective contraception for the duration of the study Effective contraceptive measures include condom with or without spermicide, a combination of male condom with either cap, diaphragm, or sponge with spermicide (double barrier methods), vasectomy, partner using stable contraceptive measures (combined [estrogen and progestogen-containing] hormonal contraception or progestogen-only hormonal contraception initiated 2 or more menstrual cycles prior to screening, intrauterine device [IUD], intrauterine hormone-releasing system [IUS], bilateral tubal ligation), and/or sexual abstinence
You likely can't join if
- Known severe thrombophilia (defined as antithrombin deficiency and/or protein S deficiency and/or protein C deficiency)
- Any major medical, psychological, or psychiatric condition that could cause the subject to be unsuitable for the study or could interfere with the interpretation of the study results
- History of or other evidence of recent alcohol or drug abuse as determined by the Investigator (in the 12 months before screening)
- Known HIV infection with CD4 count (or T-cell count) of <200 cells/μL within 24 weeks before Screening and Pre-dosing visits. Patients with HIV infection who have CD4 > 200 and meet all other criteria are eligible
- Current or planned treatment with anticoagulant or antiplatelet drugs
- Is planning to donate/bank sperm during SerpinPC treatment AND within 30 days of last dose of SerpinPC
See the full eligibility criteria
Who can join
- Male subjects ≥12 and ≤65 years of age at the time of informed consent
- Adequate hematologic function, defined as a platelet count of ≥100,000/μL (≥100 × 109/L) and hemoglobin level of ≥10 g/dL (≥100 g/L or ≥ 6.206 mmol/L) at Screening and Pre-dosing visits
- Adequate hepatic function, defined as a total bilirubin level of ≤1.5 × upper level of normal (ULN, excluding Gilbert syndrome) and aspartate aminotransferase and/or alanine aminotransferase of ≤3 × ULN at Screening and Pre-dosing visits; no clinical signs or known laboratory or radiographic evidence consistent with cirrhosis of the liver
- Adequate renal function, defined as a serum creatinine level of ≤2.0 × ULN at Screening and Pre-dosing visits
- Able to use a diary to document bleeding events and medication usage (caregiver assistance allowed for adolescents)
- Sexually active subjects with a partner who could become pregnant should agree to use effective contraception for the duration of the study Effective contraceptive measures include condom with or without spermicide, a combination of male condom with either cap, diaphragm, or sponge with spermicide (double barrier methods), vasectomy, partner using stable contraceptive measures (combined [estrogen and progestogen-containing] hormonal contraception or progestogen-only hormonal contraception initiated 2 or more menstrual cycles prior to screening, intrauterine device [IUD], intrauterine hormone-releasing system [IUS], bilateral tubal ligation), and/or sexual abstinence
- Capable of providing written informed consent (adolescent assent and parental/guardian/legal representative consent when appropriate) for participation and having the opportunity to discuss the study with the Investigator or delegate
- Historically documented HemB (defined as factor IX ≤0.05 IU/mL [≤5%])
- Subjects who are currently in a prophylaxis program must be willing to stop prophylaxis (including episodic prophylaxis for sporting events) before the first dose of SerpinPC
- Historical or ongoing factor IX inhibitor requiring current treatment with bypass agents based on medical records or laboratory reports
- Documented ABR of ≥6 in the 12 months before screening (subjects not on prophylaxis regimen) or documented ABR of ≥2 for subjects on prophylaxis regimen
- At least 12 weeks of prospective documentation of bleeding episodes in the AP-0105 non-interventional study before SerpinPC dosing, or willing to complete a 12-week observational period (at minimum) in AP-0103
- No bleeding in the 7 days before Baseline (the prospective observation period can be extended if there is an ongoing active bleed)
- D-dimer of ≤750 μg/L; in cases where there is a resolving bleed, the exclusion threshold is ≤1750 mg/L at Screening and Pre-dosing visits
What rules you out
- Known severe thrombophilia (defined as antithrombin deficiency and/or protein S deficiency and/or protein C deficiency)
- Any major medical, psychological, or psychiatric condition that could cause the subject to be unsuitable for the study or could interfere with the interpretation of the study results
- History of or other evidence of recent alcohol or drug abuse as determined by the Investigator (in the 12 months before screening)
- Known HIV infection with CD4 count (or T-cell count) of <200 cells/μL within 24 weeks before Screening and Pre-dosing visits. Patients with HIV infection who have CD4 > 200 and meet all other criteria are eligible
- Current or planned treatment with anticoagulant or antiplatelet drugs
- Is planning to donate/bank sperm during SerpinPC treatment AND within 30 days of last dose of SerpinPC
- Any other significant conditions or comorbidities that, in the opinion of the Investigator, would make the subject unsuitable for enrollment, or could interfere with participation in, or completion of the study
- Patient with previous factor IX inhibitor who responded to immune tolerance induction and remains on prophylactic factor concentrate
- Previous deep vein thrombosis (excluding line-associated thrombosis), pulmonary embolism, myocardial infarction, or stroke
- History of intolerance to SC injections
- Uncontrolled hypertension (systolic blood pressure >160 mm Hg; diastolic blood pressure >100 mm Hg)
- Weight >150 kg OR body mass index >40 kg/m2
- Has active cancer and/or requires therapy for cancer, except for basal cell carcinoma
- Participation in another interventional clinical trial (except for AP-0105) during the 30 days before screening
- Ongoing, or planned treatment with gene therapy for HemB
The study team makes the final eligibility decision.
Where it's taking place
- Brazil
- Canada
- Turkey
- Taiwan
- Japan
- Barbados
- Egypt
- India
- United States
- United Kingdom
- Australia
- Armenia
Questions & answers
Do participants get paid in this trial?
This listing doesn't specify compensation. Many trials still reimburse travel or offer a stipend, so it's worth asking the study team when you connect.
Is it free to join, and do I need insurance?
Searching and applying through BridgeMD is free. In clinical trials the study-related treatment and visits are generally provided at no cost to you. You usually don't need insurance to take part - confirm specifics with the study team.
How long does this study last?
The listing doesn't state an exact length. The study team walks you through the schedule and number of visits before you decide to enroll.
Who can join this trial?
This study is enrolling male, 18-64 years, 0-17 years. The study team makes the final eligibility decision.
Where is this trial taking place?
Study sites include Brazil; Canada; Turkey; Taiwan; Japan; Barbados and 6 more location(s). Enter your location above to see the nearest site and check your eligibility.
Explore other conditions
BridgeMD is an information and trial-matching tool - not medical advice, and not the study sponsor. Details come from EU CTIS; the study team decides eligibility.