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AMG 531

Phase 3

Thrombocytopenia | Monoclonal antibody | Hematology |Amgen Inc.|Last Updated: Nov 8, 2022

Success Probability
Approval Probability 71%
TA Base Rate26%
Adjusted LOA41%
ML RiskLOW_RISK
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Market & Valuation
rNPV $3.2B
Market Size $9.4B
Revenue Basis $1.6B
Competitors 6
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Trial Design
RandomizedDouble-BlindPLACEBO_CONTROLLEDBiomarker
Total Trials2
Total Enrollment125
FDA Designations
No designations recorded
Clinical Trials (2)
NCT IDTitlePhaseStatusEnrollmentVelocityDesignStartCompletionLast UpdatedSitesCountries
NCT00102336AMG 531 Treatment of Thrombocytopenic Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP) Prior to SplenectomyPHASE3 COMPLETED 62Apr 7, 2005Apr 1, 2007Nov 8, 2022 -
NCT00102323AMG 531 Treatment of Thrombocytopenic Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP) Refractory to SplenectomyPHASE3 COMPLETED 63Mar 29, 2005Mar 1, 2007Nov 7, 2022 -
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Study Endpoints
Primary Endpoints
To evaluate the efficacy of AMG 531 in the treatment of thrombocytopenia in subjects with ITP as measured by durable platelet response during the last 8 weeks of treatment and other platelet response parameters
Last 8 weeks of treatments
Secondary Endpoints
To evaluate the overall safety of AMG 531
Entire duration of the study including the follow up period
To evaluate possible reductions in the dose of concurrent ITP therapies while receiving AMG 531
Entire duration of the study
To evaluate changes in Patient Reported Outcomes (PRO) and Health Resource Utilization (HRU) due to treatment with AMG 531
Entire duration of the study
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Study Design & Arms
AllocationRANDOMIZED
MaskingDOUBLE
ModelPARALLEL
PurposeTREATMENT
Treatment Arms
ArmTypeDescription
AMG 531EXPERIMENTALActive investigational product
PlaceboPLACEBO_COMPARATOR -
Interventions
NameTypeDescription
AMG 531BIOLOGICALWeekly subcutaneous dosing based on screening weight and platelet count. Starting dose is at 1mcg/kg up to a maximum dose of 15mcg/kg. AMG 531 is supplied in a 5 mL single use glass vial as a sterile, white, preservative-free, lyophilized powder.
PlaceboDRUGWeekly subcutaneous dosing based on screening weight and platelet count. Starting dose is at 1mcg/kg up to a maximum dose of 15mcg/kg. Placebo is supplied as a lyophilized power in a 5 mL single use glass vial.
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Eligibility Criteria
Age Range18 Years — N/A
SexALL
Healthy VolunteersNo

Inclusion Criteria: * Diagnosis of ITP according to American Society of Hematology (ASH) guidelines (Appendix F) * Have completed as least 1 prior treatment for ITP (e.g., prednisone) * Subjects greater than 60 years of age must have a documented history of chronic ITP with a bone marrow report to ...

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