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Open Label Extension Study of AMG 531 in Thrombocytopenic Subjects With Immune (Idiopathic) Thrombocytopenic Purpura (ITP)
This study has been completed.
Study NCT00116688   Information provided by Amgen

First Received on June 30, 2005.   Last Updated on March 4, 2011   History of Changes
Results First Received: March 4, 2011  
Study Type: Interventional
Study Design: Allocation: Randomized;   Endpoint Classification: Safety/Efficacy Study;   Intervention Model: Single Group Assignment;   Masking: Open Label;   Primary Purpose: Treatment
Conditions: Thrombocytopenia
Idiopathic Thrombocytopenic Purpura
Intervention: Biological: AMG 531

  Participant Flow
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Recruitment Details
Key information relevant to the recruitment process for the overall study, such as dates of the recruitment period and locations
Participants were enrolled from 2 August 2004 through 15 April 2009

Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
No text entered.

Reporting Groups
  Description
Romiplostim (AMG 531) in Adult Population Romiplostim administered to adult participants subcutaneously weekly at doses up to 30 mcg/kg based on platelet counts. After Amendment 1 the maximum weekly dose was reduced to 15 mcg/kg, and after Amendment 2 the maximum weekly dose was reduced to 10 mcg/kg. However, participants enrolled prior to Amendment 2 who were receiving >10 mcg/kg were permitted to remain on that higher dose, but could not increase their dose. In addition, if the participant's dose was decreased, it could not be increased to >10 mcg/kg.
Romiplostim (AMG 531) in Pediatric Population Romiplostim administered to pediatric participants subcutaneously weekly at doses up to 10 mcg/kg based on platelet counts.

Participant Flow:   Overall Study
    Romiplostim (AMG 531) in Adult Population     Romiplostim (AMG 531) in Pediatric Population  
STARTED     292     21  
Received Study Medication     291     20  
COMPLETED     200     17  
NOT COMPLETED     92     4  
Protocol deviation                 1                 0  
Noncompliance                 3                 1  
Adverse Event                 11                 0  
Withdrawal by Subject                 26                 2  
Requirement for alternative therapy                 11                 1  
Physician Decision                 7                 0  
Lost to Follow-up                 3                 0  
Death                 15                 0  
Protocol-specified criteria                 3                 0  
Pregnancy                 1                 0  
Other                 11                 0  



  Baseline Characteristics
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Reporting Groups
  Description
Romiplostim (AMG 531) in Adult Population Romiplostim administered to adult participants subcutaneously weekly at doses up to 30 mcg/kg based on platelet counts. After Amendment 1 the maximum weekly dose was reduced to 15 mcg/kg, and after Amendment 2 the maximum weekly dose was reduced to 10 mcg/kg. However, participants enrolled prior to Amendment 2 who were receiving >10 mcg/kg were permitted to remain on that higher dose, but could not increase their dose. In addition, if the participant's dose was decreased, it could not be increased to >10 mcg/kg.
Romiplostim (AMG 531) in Pediatric Population Romiplostim administered to pediatric participants subcutaneously weekly at doses up to 10 mcg/kg based on platelet counts.

Baseline Measures
    Romiplostim (AMG 531) in Adult Population     Romiplostim (AMG 531) in Pediatric Population     Total  
Number of Participants  
[units: participants]
  292     21     313  
Age  
[units: Years]
Mean ± Standard Deviation
  54.2  ± 16.9     10.2  ± 5.1     51.3  ± 19.7  
Gender  
[units: Participants]
     
Female     184     6     190  
Male     108     15     123  
Race/Ethnicity, Customized  
[units: Participants]
     
Black or African American     13     3     16  
White or Caucasian     246     13     259  
Hispanic or Latino     21     4     25  
Asian     9     0     9  
Japanese     1     0     1  
American Indian or Alaska Native     1     0     1  
Native Hawaiian or Other Pacific Islander     1     0     1  
Other     0     1     1  



  Outcome Measures
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1.  Primary:   Adverse Events   [ Time Frame: Duration of treatment plus 8 weeks (up to 285 weeks) ]

2.  Secondary:   Platelet Response   [ Time Frame: Duration of treatment (up to 277 weeks) ]

3.  Secondary:   Reduction or Discontinuation of Concurrent ITP Therapies   [ Time Frame: Duration of treatment (up to 277 weeks) ]


  Serious Adverse Events
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  Other Adverse Events
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  More Information
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Certain Agreements:  
Principal Investigators are NOT employed by the organization sponsoring the study.
There IS an agreement between Principal Investigators and the Sponsor (or its agents) that restricts the PI's rights to discuss or publish trial results after the trial is completed.
The agreement is:
unchecked The only disclosure restriction on the PI is that the sponsor can review results communications prior to public release and can embargo communications regarding trial results for a period that is less than or equal to 60 days. The sponsor cannot require changes to the communication and cannot extend the embargo.
unchecked The only disclosure restriction on the PI is that the sponsor can review results communications prior to public release and can embargo communications regarding trial results for a period that is more than 60 days but less than or equal to 180 days. The sponsor cannot require changes to the communication and cannot extend the embargo.


Limitations and Caveats
Limitations of the study, such as early termination leading to small numbers of participants analyzed and technical problems with measurement leading to unreliable or uninterpretable data
No text entered.  


Results Point of Contact:  
Name/Title: Study Director
Organization: Amgen Inc.
phone: 866-572-6436


Publications of Results:
Publications automatically indexed to this study:

Responsible Party: Global Development Leader, Amgen Inc.
ClinicalTrials.gov Identifier: NCT00116688     History of Changes
Other Study ID Numbers: 20030213
Study First Received: June 30, 2005
Results First Received: March 4, 2011
Last Updated: March 4, 2011
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