INdividualized ITI Based on Fviii(ATE) Protection by VWF (INITIATE)
试验速览
- 阶段
- 4 期
- 状态
- 终止
- 入组人数
- 1
- 试验地点
- 3
- 主要终点
- Time to Negative Inhibitor
研究概览
简要总结
The primary goal of the INITIATE trial is to compare the clinical outcome of individualized lot selection to random lot selection utilizing one plasma-derived von Willebrand factor (VWF)/coagulation factor (FVIII) complex concentrate for immune tolerance induction (ITI) in subjects with congenital Hemophilia A, FVIII activity ≤2%, and a historical high-titer inhibitor [≥5 Bethesda Unit (BU)].
详细描述
Participants will be randomized on a one-to-one basis between one of two study arms, individualized lot selection (alternative treatment arm) and random lot selection (standard treatment arm, current US clinical practice in ITI). Study sites, participants, and investigators will be blinded to the treatment status assigned.
Alternative treatment arm:
Half of the participants will be randomized to blinded individualized lot selection for ITI. The target initial dose of FVIII for ITI is ~200 IU/kg/day intravenously. The suggested maximum dose is 20,000 IU/day. Investigators may adjust the dose to a minimum dose of 150 units/kg if infusion volume is not feasible in patients without central venous access or in patients with von Willebrand factor levels >250%. Splitting dose into two infusions per day must be approved by the Steering Committee, and if approved, will be considered a protocol deviation. Wilate® will be the VWF/FVIII complex concentrate (Octapharma USA, Inc., U.S. License No. 1646) prescribed for ITI.
Individualized lot selection will be performed according to a modified Oxford method in a central laboratory, by testing subject's plasma against 4-6 lots of Wilate® and selecting the one with the highest residual FVIII (lowest Oxford titer) activity remaining after incubation. The same lot will be used throughout the entire ITI course for each subject. If the selected lot is depleted prior to the completion of ITI, a second individualized lot selection will be performed using the original plasma sample provided at baseline.
Each Wilate® batch includes 1.6-1.8 million IU and is expected to last for about 3-57 months depending on the weight of the subject and prescribed dose.
研究设计
- 研究类型
- Interventional
- 分配方式
- Randomized
- 干预模型
- Parallel
- 主要目的
- Treatment
- 盲法
- Quadruple (Participant, Care Provider, Investigator, Outcomes Assessor)
入排标准
- 性别
- Male
- 接受健康志愿者
- 否
入选标准
- •Diagnosis of congenital Hemophilia A and baseline FVIII ≤2%.
- •Weight ≥ 5 kg
- •History of FVIII inhibitor titer ≥5 BU
- •Current FVIII inhibitor titer ≥5 BU or ≥0.6 BU and failed ITI defined by FVIII recovery <66% normal and half-life <6 hours
- •Adequate venous access for daily concentrate infusions
- •For participants <18 years, a parent or guardian willing and able to provide informed consent with verbal or written assent from the child if require by the local institution. For participants ≥18 years, a willingness and ability to provide informed consent from the subject.
- •Ability to comply with study related treatments, evaluations, and follow-up.
排除标准
- •Acquired hemophilia
- •Congenital or acquired bleeding disorder in addition to Hemophilia A
- •ITI factor replacement regimen within the past one month unless there is clear evidence of ITI failure with no reduction in inhibitor titer over the past two months
- •HIV positive with viral load ≥200 particles/μL or ≥400,000 copies/mL
- •Rituximab within the past 3 months
- •IVIG within the past 1 month
- •Treatment with other immunosuppressive drugs within the past 1 month (excluding intermittent steroid use for asthma)
- •Concomitant experimental treatment
- •History of hypersensitivity to plasma-derived VWF- or FVIII-containing concentrates
- •Elective surgery planned in the next 6 months (excluding vascular access procedure)
- •Any condition or chronic illness, which in the opinion of the investigator makes participation ill-advised
- •Inability or unwillingness to complete required screening, follow-up, and exit studies
研究组 & 干预措施
Alternative Treatment
Half of the participants will be randomized to blinded individualized lot selection for ITI.
干预措施: Wilate (Drug)
Standard Treatment
The other half of the participants will receive random lot selection for ITI.
干预措施: Wilate (Drug)
结局指标
主要结局
Time to Negative Inhibitor
时间窗: completion of immune tolerance induction, up to 18 months
This endpoint was chosen because a shorter time to negative inhibitor should decrease monthly break-through bleeding frequency in the early phase of ITI
次要结局
- Understand Other Factors Related to ITI Success Using Additional Biologic Assays(screening/baseline)
- Time to Achieve Partial and Complete Success(completion of immune tolerance induction, up to 18 months)
- Absence of Relapse, up to 12 Months After Achievement of Complete or Partial ITI Success(one year after completion of immune tolerance induction, up to 30 months)
- The Number of Break-through Bleeding Events During the Course of ITI-treatment·(completion of immune tolerance induction, up to 18 months)
- Cost of ITI - Including Bleeding Control Using Bypassing Agents Prior to Start and During ITI(completion of immune tolerance induction, up to 18 months)
- Subject Quality of Life(completion of immune tolerance induction, up to 18 months)
- Subject Compliance With ITI Treatment Regimen(completion of immune tolerance induction, up to 18 months)
- The Impact of Inhibitor Titer at Start of ITI and During the Course of ITI, Including the Peak Titer of the Inhibitor(completion of immune tolerance induction, up to 18 months)