Caplacizumab and immunosuppressive therapy without firstline therapeutic plasma exchange in adults with immune-mediated thrombotic thrombocytopenic purpura
- Conditions
- Thrombotic Thrombocytopenic Purpura
- Registration Number
- JPRN-jRCT2031230030
- Lead Sponsor
- Tanaka Tomoyuki
- Brief Summary
Not available
- Detailed Description
Not available
Recruitment & Eligibility
- Status
- Recruiting
- Sex
- All
- Target Recruitment
- 61
Participants with a clinical diagnosis of iTTP (initial or recurrent), which includes thrombocytopenia, microangiopathic hemolytic anemia (eg, presence of schistocytes in peripheral blood smear) and relatively preserved renal function. The iTTP diagnosis should be confirmed by ADAMTS13 testing within 48 hours (2 days).
- Participants with a clinical diagnosis of iTTP and a French TMA score of 1 or 2.
- A female participant is eligible to participate if she is not pregnant or breastfeeding, and one of the following conditions applies:
Is a woman of nonchildbearing potential (WONCBP),
OR
Is a woman of childbearing potential (WOCBP) and agrees to use an acceptable contraceptive method during the overall treatment period and for at least 2 months after the last study drug administration.
- Male participants with female partners of childbearing potential must agree to follow the contraceptive guidance as per protocol during the overall treatment period and for at least 2 months after last study drug administration.
Participants are excluded from the study if any of the following criteria apply:
- Platelet count >=100 x 10^9/L.
- Serum creatinine level >2.26 mg/dL (200 micro mol/L) in case platelet count is >30 x 10^9/L (to exclude possible cases of atypical HUS).
- Known other causes of thrombocytopenia including but not limited to:
- - Clinical evidence of enteric infection with E. coli 0157 or related organism.
- - Atypical HUS.
- - Hematopoietic stem cell, bone marrow or solid organ transplantation-associated thrombotic microangiopathy.
- - Known or suspected sepsis.
- - Diagnosis of disseminated intravascular coagulation.
- Congenital TTP (known at the time of study entry).
- Clinically significant active bleeding or known co-morbidities associated with high risk of bleeding (excluding thrombocytopenia).
- Inherited or acquired coagulation disorders.
- Malignant arterial hypertension.
- Participants requiring or expected to require invasive procedures immediately (eg, stroke requiring thrombolytic therapy, those who need mechanical ventilation, etc.).
- Those presenting with severe neurological (ie, coma, seizures) or severe cardiac disease (cTnl >2.5 x ULN).
- Clinical condition other than that associated with TTP, with life expectancy <6 months, such as end-stage malignancy.
- Known chronic treatment with anticoagulants and anti-platelet drugs that cannot be stopped (interrupted) safely, including but not limited to:
- - vitamin K antagonists.
- - direct-acting oral anticoagulants.
- - heparin or low molecular weight heparin (LMWH).
- - non-steroidal anti-inflammatory molecules other than acetyl salicylic acid.
- Participants who were previously enrolled in this clinical study (study EFC16521).
- Participants who received an investigational drug, or device, other than caplacizumab, within 30 days of anticipated IMP administration or 5 half-lives of the previous investigational drug, whichever is longer.
- Positive result on the Screening SARS-CoV-2 RT-PCR test.
Study & Design
- Study Type
- Interventional
- Study Design
- Not specified
- Primary Outcome Measures
Name Time Method 1. Proportion of participants achieving Remission without requiring therapeutic plasma exchange (TPE).<br>[Time Frame baseline: Overall study period from day 1 to day 168 (treatment period + 12 weeks of follow-up) ]<br>Remission is defined as sustained Clinical Response (sustained platelet count >= 150 x 10^9/L and lactate dehydrogenase [LDH] <1.5 x upper limit of normal [ULN] and no clinical evidence of new or progressive ischemic organ injury for at least 2 consecutive visits) with either (a) no TPE and no anti- von Willebrand factor (anti-vWF) therapy for >= 30 days (Clinical Remission), or (b) with attainment of a disintegrin and metalloproteinase with a thrombospondin type 1 motif13 (ADAMTS13) >= 50% (Complete ADAMTS13 remission), whichever occurs first
- Secondary Outcome Measures
Name Time Method