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Safety and Efficacy Study of Romiplostim (AMG 531) to Treat ITP in Pediatric Subjects

This study has been completed.
Information provided by (Responsible Party):
Amgen Identifier:
First received: August 9, 2007
Last updated: July 18, 2014
Last verified: July 2014
The purpose of this study is to evaluate the safety and tolerability of romiplostim (AMG 531) in the treatment of thrombocytopenia in pediatric subjects with chronic ITP. We will also evaluate the efficacy of romiplostim (AMG 531) and characterize the pharmacokinetics of romiplostim (AMG 531). It is anticipated that romiplostim (AMG 531), when given at an effective dose and schedule, will be well tolerated treatment for thrombocytopenia among pediatric subjects with chronic ITP.

Condition Intervention Phase
Idiopathic Thrombocytopenic Purpura
Thrombocytopenia in Pediatric Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP)
Thrombocytopenia in Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP)
Drug: Placebo
Drug: AMG 531
Phase 1
Phase 2

Study Type: Interventional
Study Design: Allocation: Randomized
Endpoint Classification: Safety/Efficacy Study
Intervention Model: Parallel Assignment
Masking: Double Blind (Subject, Investigator, Outcomes Assessor)
Primary Purpose: Treatment
Official Title: A Randomized, Double-Blind, Placebo-controlled Phase 1/2 Study to Determine the Safety and Efficacy of Romiplostim (AMG 531) in Thrombocytopenic Pediatric Subjects With Chronic Immune (Idiopathic) Thrombocytopenic Purpura

Resource links provided by NLM:

Further study details as provided by Amgen:

Primary Outcome Measures:
  • Adverse Events [ Time Frame: 12 weeks ] [ Designated as safety issue: Yes ]
    Occurrence of one or more adverse events in the participant during the 12-week treatment period

Secondary Outcome Measures:
  • Weeks With Platelet Count ≥ 50 x 10^9/L [ Time Frame: 12-week treatment period ] [ Designated as safety issue: No ]
    The number of weeks with platelet count ≥ 50 x 10^9/L during the 12 week treatment period.

  • Bleeding Events (Grade 2 or Higher) [ Time Frame: 12-week treatment period (Weeks 2 - 13) ] [ Designated as safety issue: No ]
    Total number of bleeding events (Grade 2 or higher, i.e., mild to life-threatening, as defined in the protocol) for each participant during Weeks 2-13 (end-of-study visit for non-responders)

  • Platelet Count ≥ 50 x 10^9/L for Two Consecutive Weeks [ Time Frame: 12-week treatment period ] [ Designated as safety issue: No ]
    Participant incidence of achieving a platelet count ≥50 x 10^9/L for two consecutive weeks during the 12 week treatment period.

  • Increase in Platelet Count ≥ 20 x 10^9/L Above Baseline for Two Consecutive Weeks [ Time Frame: 12-week treatment period ] [ Designated as safety issue: No ]
    Participant incidence of achieving an increase in platelet count ≥20 x 10^9/L above baseline for two consecutive weeks during the 12 week treatment period.

  • Requirement for Rescue Therapy (as Defined Per Protocol) [ Time Frame: 12-week treatment period ] [ Designated as safety issue: No ]
    Participant required rescue therapy (as defined per protocol) during the 12 week treatment period.

Enrollment: 22
Study Start Date: July 2007
Study Completion Date: August 2009
Primary Completion Date: March 2009 (Final data collection date for primary outcome measure)
Arms Assigned Interventions
Placebo Comparator: II.
5 thrombocytopenic (as defined per protocol) subjects
Drug: Placebo
Starting dose of 1.0 ug/kg. Dose adjustments are made throughout the study based on individual platelet counts.
Experimental: I.
15 thrombocytopenic (as defined per protocol) subjects
Drug: AMG 531
Starting dose of 1.0 ug/kg. Dose adjustments are made throughout the study based on individual platelet counts.
Other Name: romiplostim


Ages Eligible for Study:   1 Year to 17 Years   (Child)
Genders Eligible for Study:   Both
Accepts Healthy Volunteers:   No

Inclusion Criteria:

  • Before any study-specific procedure, the appropriate written informed consent must be obtained. In addition to the written informed consent, the assent of the child from those subjects capable of providing assent must also be obtained if requested by the IRB/IEC.
  • Diagnosis of ITP according to The American Society of Hematology (ASH) Guidelines at least six months prior to screening
  • Age ≥ 12 months and < 18 years at enrollment
  • The mean of two platelet counts taken during the screening period must be ≤ 30 x 10^9/L with no single count >35 x 10^9/L
  • A serum creatinine concentration ≤ 1.5 times the laboratory normal range (for each age category)
  • Adequate liver function; serum bilirubin ≤ 1.5 times the laboratory normal range
  • Hemoglobin >10.0 g/dL

Exclusion Criteria:

  • Known history of a bone marrow stem cell disorder (any abnormal bone marrow findings other than those typical of ITP must be approved by Amgen before a subject may be enrolled in the study)
  • Known history of venous or arterial thrombotic or thromboembolic event
  • Known history of congenital thrombocytopenia
  • Known history of malignancy except basal cell carcinoma
  • Known history of hepatitis B, hepatitis C, or HIV
  • Known history of systemic lupus erythematosus, Evans Syndrome, or autoimmune neutropenia
  • Known positive lupus anticoagulant or history of antiphospholipid antibody syndrome
  • Known history of Disseminated Intravascular Coagulation, Hemolytic Uremic Syndrome, or Thrombotic Thrombocytopenic Purpura
  • Currently receiving any treatment for ITP except for corticosteroids
  • IV Ig or anti-D Ig within two weeks prior to the screening visit
  • Rituximab (for any indication) within 14 weeks before the screening visit or anticipated use during the time of the proposed study
  • Splenectomy within eight weeks of the screening visit
  • Received hematopoietic growth factors including IL-11 (oprelvekin) within four weeks before the screening visit
  • Received any alkylating agents within eight weeks before the screening visit or anticipated use during the time of the proposed study
  • Subject is currently enrolled in or has not yet completed at least four weeks since ending other investigational device or drug trial(s), or subject is receiving investigational agent(s)
  • Past or present participation in any study evaluating PEG-rHuMGDF, recombinant human thrombopoietin (rHuTPO), AMG 531, or related platelet product
  • Pregnant (i.e. positive urine pregnancy test) or breast feeding
  • Subject is not using adequate contraceptive precautions, if applicable.
  • Known hypersensitivity to any recombinant E coli-derived product
  • Subject has any kind of disorder that compromises the ability to comply with all study procedures
  Contacts and Locations
Choosing to participate in a study is an important personal decision. Talk with your doctor and family members or friends about deciding to join a study. To learn more about this study, you or your doctor may contact the study research staff using the Contacts provided below. For general information, see Learn About Clinical Studies.

Please refer to this study by its identifier: NCT00515203

Sponsors and Collaborators
Study Director: MD Amgen
  More Information

Additional Information:
Bussel J, Buchanan G, Nugent D, Gnarra D, Blanchette V, Nie K, Jun S. A randomized, double-blind, placebo-controlled phase 1/2 study to determine the safety and efficacy of romiplostim in children with chronic Immune (Idiopathic) Thrombocytopenic Purpura (ITP). Blood;2011;118:28-36

Publications automatically indexed to this study by Identifier (NCT Number):
Responsible Party: Amgen Identifier: NCT00515203     History of Changes
Other Study ID Numbers: 20060195 
Study First Received: August 9, 2007
Results First Received: October 28, 2010
Last Updated: July 18, 2014
Health Authority: Australia: Therapeutic Goods Administration
Canada: Health Canada
France: Afssaps - Agence française de sécurité sanitaire des produits de santé (Saint-Denis)
Spain: Agencia Española de Medicamentos y Productos Sanitarios
United States: Food and Drug Administration
Australia: Department of Health and Ageing Therapeutic Goods Administration
Australia: Human Research Ethics Committee
United States: Institutional Review Board

Keywords provided by Amgen:
Immune (Idiopathic) Thrombocytopenic Purpura
Pediatric Idiopathic Thrombocytopenic Purpura

Additional relevant MeSH terms:
Purpura, Thrombocytopenic
Purpura, Thrombocytopenic, Idiopathic
Blood Platelet Disorders
Hematologic Diseases
Blood Coagulation Disorders
Pathologic Processes
Skin Manifestations
Signs and Symptoms
Thrombotic Microangiopathies
Immune System Diseases
Hemorrhagic Disorders
Autoimmune Diseases processed this record on December 08, 2016