Study To Compare On-Demand Treatment To A Prophylaxis Regimen Of BeneFIX In Subjects With Moderately Severe to Severe Hemophilia B
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|ClinicalTrials.gov Identifier: NCT01335061|
Recruitment Status : Completed
First Posted : April 13, 2011
Results First Posted : May 4, 2015
Last Update Posted : June 8, 2015
|Condition or disease||Intervention/treatment||Phase|
|Hemophilia B||Biological: Nonacog alfa||Phase 3|
|Study Type :||Interventional (Clinical Trial)|
|Actual Enrollment :||25 participants|
|Intervention Model:||Single Group Assignment|
|Masking:||None (Open Label)|
|Official Title:||A Multicenter, Open-label Study To Compare On-demand Treatment To A Prophylaxis Regimen Of Nonacog-alfa (Benefix) In Subjects With Moderately Severe To Severe Hemophilia B (Fix:c</=2%)|
|Study Start Date :||September 2011|
|Actual Primary Completion Date :||April 2014|
|Actual Study Completion Date :||April 2014|
Biological: Nonacog alfa
Period 1: During on-demand period, dosing at the discretion of investigator.
Other Name: BeneFIX
Biological: Nonacog alfa
Period 2: During the prophylaxis period, 100 IU/kg once weekly
Other Name: BeneFIX
- Annualized Number of Bleeding Episodes. [ Time Frame: 2 years ]The annualized bleed rate (ABR) or the annualized number of bleeding episodes per year, will be derived for each participant for each treatment period by using the following formula: ABR = number of bleeds / (Days on treatment period / 365.25) The number of bleeds for the ABR calculation includes all bleeds requiring treatment with factor IX product during the time on treatment.
- Response to On-Demand Treatment for All Bleeding Episodes. [ Time Frame: 2 years ]Assessment scores on a 4-point Response Scale for an on-demand bleeding episode, as assessed by participant/caregiver or investigator/qualified staff. The 4-point scale assessments are Excellent, Good, Moderate or No response. Responses to number of observations were noted.
- Number of Nonacog Alfa, Recombinant Factor IX (BeneFIX) Infusions Used to Treat Each Bleeding Episode. [ Time Frame: 2 years ]The number of study drug infusions administered to treat a bleed will be calculated by adding the initial (on-demand) infusion to any subsequent (on-demand) infusions for the same bleed (same bleed start date/time). The number of infusions needed to treat a bleed will be classified into the following categories: 1, 2, 3, 4 and >4 infusions. If there were more than one bleed location (e.g., ankle and joint) with identical bleed start date and time, it was treated as one bleed occurrence.
- Number of Breakthrough (Spontaneous/Non-Traumatic) Bleeds Within 48 Hours of a Prophylaxis Dose of BeneFIX. [ Time Frame: 2 years ]The number of spontaneous, non-traumatic breakthrough bleeds within 48 hours following a prophylaxis dose of BeneFIX were summarized. If there was more than one bleed location (eg, ankle and joint) with identical bleed start date and time, it was treated as one bleed occurrence.
- Average Infusion Dose. [ Time Frame: 2 years ]The mean dose by per infusion by weight (IU/kg) was reported for both prophylaxis and on demand infusions
- Total Factor Consumption. [ Time Frame: 2 years ]The total amount (IU) infused for each infusion recorded were summed to calculate the total factor consumption for each participant. For each infusion, IU/kg was calculated, using the most recently recorded weight measurement and the total factor consumption, divided by number of infusions, and was summarized similarly to average infusion dose (IU). Annualized TFC by weight was reported. Annualized TFC by weight = (Total IU/kg / treatment interval duration)*365.25.
- Incidence of Less Than Expected Therapeutic Effect (LETE) [ Time Frame: 2 years ]The following criteria are the definitions for LETE in this study: 1. LETE in the On-Demand Setting: LETE occurs in the on-demand setting if 2 successive "No Response" ratings are recorded after 2 successive BeneFIX drug infusions in the absence of confounding factors. 2. LETE in the Prophylaxis Setting: LETE occurs in the prophylaxis setting if there is a spontaneous bleed within 48 hours (≤ 48 hours) after a regularly scheduled prophylactic dose of BeneFIX in the absence of confounding factors. 3. LETE (Low Recovery): LETE can also be lower than expected recovery of FIX in the opinion of the investigator following infusion of BeneFIX in the absence of confounding factors. Each reported occurrence of low recovery LETE was listed.
To learn more about this study, you or your doctor may contact the study research staff using the contact information provided by the sponsor.
Please refer to this study by its ClinicalTrials.gov identifier (NCT number): NCT01335061
|Study Director:||Pfizer CT.gov Call Center||Pfizer|