A Phase III Study of Apixaban in Patients With Atrial Fibrillation (AVERROES)

This study is ongoing, but not recruiting participants.
Sponsor:
Collaborator:
Pfizer
Information provided by (Responsible Party):
Bristol-Myers Squibb
ClinicalTrials.gov Identifier:
NCT00496769
First received: July 2, 2007
Last updated: July 8, 2014
Last verified: July 2014
Results First Received: August 1, 2013  
Study Type: Interventional
Study Design: Allocation: Randomized;   Endpoint Classification: Safety/Efficacy Study;   Intervention Model: Parallel Assignment;   Masking: Double Blind (Subject, Investigator);   Primary Purpose: Prevention
Condition: Atrial Fibrillation
Interventions: Drug: Apixaban
Drug: Acetylsalicylic acid

  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
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Pre-Assignment Details
Significant events and approaches for the overall study following participant enrollment, but prior to group assignment
A total 6421 patients were enrolled in the study. Of these, 5598 were randomized (2807 to apixaban and 2791 to acetylsalicylic acid). Most (435) of the patients who were not randomized (823) no longer met study criteria. Of those randomized, 5578 received treatment (2798 with apixaban, and 2780 with acetylsalicylic acid).

Reporting Groups
  Description
Apixaban, 2.5 or 5 mg Twice Daily Patients received 5 mg of apixaban twice daily. Participants who fulfilled any 2 of the following criteria at baseline received apixaban, 2.5 mg twice daily: age older than 80 years, body weight of 60 kg or less, Serum creatinine level ≥1.5 mg/dL. Participants randomized to the 2.5 mg twice daily dose of apixaban continued on this dose throughout the study even if they no longer fulfilled the previous criteria.
Acetylsalicylic Acid, 81-324 mg Once Daily Patients received 81 to 324 mg of acetylsalicylic acid once daily, with dosage based on investigator discretion

Participant Flow:   Overall Study
    Apixaban, 2.5 or 5 mg Twice Daily     Acetylsalicylic Acid, 81-324 mg Once Daily  
STARTED     2807 [1]   2791 [1]
Received Treatment     2798     2708  
COMPLETED     2249     2142  
NOT COMPLETED     558     649  
>=1 reason assigned per patient                 558                 649  
[1] Randomized



  Baseline Characteristics
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Population Description
Explanation of how the number of participants for analysis was determined. Includes whether analysis was per protocol, intention to treat, or another method. Also provides relevant details such as imputation technique, as appropriate.
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Reporting Groups
  Description
Apixaban, 2.5 or 5 mg Twice Daily Patients received 5 mg of apixaban twice daily. Participants who fulfilled any 2 of the following criteria at baseline received apixaban, 2.5 mg twice daily: age older than 80 years, body weight of 60 kg or less, Serum creatinine level ≥1.5 mg/dL. Participants randomized to the 2.5 mg twice daily dose of apixaban continued on this dose throughout the study even if they no longer fulfilled the previous criteria.
Acetylsalicylic Acid, 81-324 mg Once Daily Patients received 81 to 324 mg of acetylsalicylic acid once daily, with dosage based on investigator discretion
Total Total of all reporting groups

Baseline Measures
    Apixaban, 2.5 or 5 mg Twice Daily     Acetylsalicylic Acid, 81-324 mg Once Daily     Total  
Number of Participants  
[units: participants]
  2807     2791     5598  
Age  
[units: years]
Mean ± Standard Deviation
  69.7  ± 9.44     70.0  ± 9.71     69.9  ± 9.58  
Age, Customized  
[units: Participants]
     
< 65 years     855     865     1720  
>=65 but <75 years     1049     938     1987  
>=75 years     903     988     1891  
Gender  
[units: participants]
     
Female     1147     1174     2321  
Male     1660     1617     3277  
Race/Ethnicity, Customized  
[units: participants]
     
American Indian or Alaska Native     6     6     12  
Asian     541     544     1085  
Native Hawaiian or Other Pacific Islander     3     1     4  
Black or African American     10     26     36  
White     2221     2178     4399  
Other     26     36     62  
Number of Participants by Number of Risk Factors for Stroke  
[units: Participants]
     
1 or fewer     1085     1077     2162  
2 or more     1722     1714     3436  
Number of Participants With Risk Factors for Stroke [1]
[units: Participants]
     
Age of 75 years or older     903     988     1891  
Prior stroke or transient ischemic attack     390     374     764  
Heart failure (NYHA class ≥2) or LVEF ≤35%     961     926     1887  
Diabetes mellitus     536     559     1095  
Hypertension requiring pharmacologic treatment     2408     2429     4837  
Peripheral artery disease     66     78     144  
[1] NYHA=New York Health Authority; LVEF=left ventricular ejection fraction



  Outcome Measures
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1.  Primary:   Event Rate of Stroke/Systemic Embolism During the Intended-treatment Period   [ Time Frame: Randomization to efficacy cutoff date of May 28, 2010 (date revised following cessation of study for superior efficacy) ]

2.  Primary:   Rate of Unrefuted Bleeding From First Dose of Double-blind Study Drug to First Occurence of Unrefuted Bleeding During the Double-blind Treatment Period   [ Time Frame: Day 1 to first bleeding event up to efficacy cutoff date of May 28, 2010 (date revised following cessation of study for superior efficacy) ]

3.  Secondary:   Event Rates of Major Vascular Events (Stroke/Systemic Embolism, Myocardial Infarction, Death) in the Intended-treatment Period   [ Time Frame: Randomization to efficacy cutoff date of May 28, 2010 (date revised following cessation of study for superior efficacy) ]

4.  Secondary:   Event Rates for Major Bleeding, Major or Clinically Relevant Nonmajor (CNRM) Bleeding, and All Bleeding in the Double-blind Period   [ Time Frame: First dose of study drug (Day 1) to the earlier of a patient's discontinuation of double-blind study drug or the attainment of at least 226 primary efficacy events up to May 28, 2010 ]

5.  Secondary:   Number of Participants With Serious Adverse Events (SAEs), Adverse Events (AEs), Bleeding AEs, Discontinuations Due to AEs, and Death as Outcome   [ Time Frame: First dose of study drug (Day 1) to 30 days after last dose of blinded study drug ]

6.  Secondary:   Number of Participants With Laboratory Test Results Meeting the Criteria for Marked Abnormality   [ Time Frame: First dose of study drug (Day 1) to 30 days after last dose of blinded study drug ]

7.  Secondary:   Number of Participants With Laboratory Test Results Meeting the Criteria for Marked Abnormality (Continued)   [ Time Frame: First dose of study drug (Day 1) to 30 days after last dose of blinded study drug ]

8.  Secondary:   Number of Participants With Laboratory Test Results Meeting the Criteria for Marked Abnormality (Continued)   [ Time Frame: First dose of study drug (Day 1) to 30 days after last dose of blinded study drug ]

9.  Secondary:   Event Rate of All-cause Death; Net Clinical Benefit-Composite of Stroke, Systemic Embolism, Myocardial Infarction, Vascular Death, and Major Bleeding; and Vascular Death   [ Time Frame: Randomization to efficacy cutoff date of May 28, 2010 (date revised following cessation of study for superior efficacy) ]


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