Clinical Trial: Open-Label Extension Of Intravenous Mepolizumab In Patients With Hypereosinophilic Syndrome

Study Status: Terminated
Recruit Status: Terminated
Study Type: Interventional

Official Title: An Open-Label Extension Study to Study MHE100185, to Evaluate Long-term Safety, Efficacy and Optimal Dosing Frequency of 750 mg Intravenous Mepolizumab in Subjects With Hypereosi

Brief Summary: This is an open label study of mepolizumab 750 mg intravenous in those subjects who participated in study 100185 to evaluate the long term safety and efficacy of mepolizumab in subjects with hypereosinophilic syndrome. The study will also evaluate the optimal dosing frequency for clinical use, the effects on corticosteroid reduction, and decrease of signs and symptoms of Hypereosinophilic Syndrome.

Detailed Summary:
Sponsor: GlaxoSmithKline

Current Primary Outcome:

  • Number of Participants With Any Adverse Event (AE) During the Treatment Phase [ Time Frame: From the first dose of study medication up to 7 days after the last dose (up to approximately 6 years) ]
    An AE is any untoward medical occurrence in clinical investigation participants temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. AEs are summarized by Treatment phase. Safety and tolerability of the study drug was assessed by number of participants with any AE
  • Number of Participants With Any Adverse Event (AE) During the Follow-up Phase [ Time Frame: From end of Treatment Phase up to 97 days after the last dose date (up to approximately 6 years) ]
    An AE is any untoward medical occurrence in clinical investigation participants temporally associated with the use of a medicinal product, whether or not considered related to the medicinal product. AEs are summarized by Follow-up phase. Safety and tolerability of the study drug was assessed by number of participants with any AE


Original Primary Outcome:

Current Secondary Outcome:

  • Number of Participants Achieving a Prednisone Level of =<10 mg (as Sole Background Therapy) at the End of Study [ Time Frame: up to approximately 6 years ]
    Participants who were receiving a prednisone dose level of =<10 mg as their sole background therapy at the end of the study were included for the analysis.
  • Number of Participants Achieving an Eosinophil Level of < 600 Cell/Microliter (uL) (in Addition to the Lowest Background Therapy) at the End of Study [ Time Frame: up to approximately 6 years ]
    The criteria for eosinophil count was achieved if the participant's eosinophil count remained below <600 cell/uL for the last observation on study i.e. within length of dosing cycle + 7 days of last dose of study drug. For participants who entered in Stage 1, HES medications taking prior to the first infusion date in Stage 2 were considered as the lowest background therapy. For participants who entered in Stage 2, HES medications taken on the date that immediately preceded the first infusion date of study drug and had not been discontinued was regarded as the lowest background therapy. If the dose of the lowest background therapy had increased or the medication had changed or the participant had not reached their lowest background therapy, the participant was regarded as not achieving this endpoint.
  • For Those Participants Who Completed 9 Months of Dosing in Study MHE100185 and Achieved a Prednisone Level <=10 mg: Number of Participants Achieving <= 10 mg Prednisone (as Sole Background Therapy) for >= 3months [ Time Frame: up to approximately 6 years ]
    Participants from study MHE100185 who completed the 9 months treatment period and achieved a level of <=10 mg of prednisone at study end were analyzed. Duration of doses <=10 mg was determined by examining changes in the prednisone dosing or allowable alternative corticosteroid medication (prednisone equivalents). Start and stop dates of other HES medications were checked to ensure that they did not overlap with the steroid dosing dates. If it did, then the number of days <=10 mg during this overlap was considered as zero and the cumulative days reset to zero, as the endpoint was assessing prednisone dose as sole background therapy. The dosing criteria for this endpoint was considered as achieved if the duration of dosing was minimum of 84 days (3months).
  • For Those Participants Who Completed 9 Months of Dosing in Study MHE100185 and Achieved a Prednisone Level >10 mg: Number of Participants Achieving <=10 mg Prednisone (as Sole Background Therapy) for >= 8 Weeks [ Time Frame: up to approximately 6 years ]
    Participants from study MHE100185 who completed the 9 months treatment period and achieved a level of prednisone of >10 mg at the end of the study were analyzed. Duration of doses <= 10 mg were determined by examining changes in the prednisone dosing or allowable alternative corticosteroid medication (prednisone equivalents). Start and stop dates of other HES medications were checked to ensure that they did not overlap with the steroid dosing dates. If overap occurred, then the number of days <=10 mg during this overlap was considered as zero and the cumulative days reset to zero, as the endpoint was assessing prednisone dose as sole background therapy. The dosing criteria for this endpoint was considered as achieved if the duration of dosing was minimum of 53 days (8 weeks).
  • For Those Participants Who Entered Stage 2 From Study MHE100185 With a Prednisone Level of <=10 mg Prednisone: Number of Participants Achieving a Prednisone Dose <=10 mg (as Sole Background Therapy) for >=3 Months; [ Time Frame: up to approximately 6 years ]
    Participants from study MHE100185 who completed the 9 months treatment period and achieved a level of <=10 mg of prednisone at study end and participants who withdrew from the study early who were at a prednisone dose level <=10 mg were analyzed. Duration of doses <= 10 mg were determined by examining changes in the prednisone dosing or allowable alternative corticosteroid medication (prednisone equivalents). Start and stop dates of other HES medications were checked to ensure that they did not overlap with the steroid dosing dates. If overlap occurred, then the number of days <=10 mg during this overlap was considered as zero and the cumulative days reset to zero, as the endpoint was assessing prednisone dose as sole background therapy. The dosing criteria for this endpoint was considered as achieved if the duration of dosing was minimum of 84 days (3months).
  • For Those Participants Who Entered Stage 1 From Study MHE100185 With >10 mg Prednisone: Number of Participants Achieving a Prednisone Dose <=10 mg (as Sole Background Therapy) for>=3 Months [ Time Frame: up to approximately 6 years ]
    Participants from study MHE100185 who completed the 9 months treatment period and achieved a level of >10 mg prednisone at the end of the study and participants who withdrew from the study early who were at a prednisone dose level >10 mg were analyzed. Duration of doses <= 10 mg was determined by examining changes in the prednisone dosing or allowable alternative corticosteroid medication (prednisone equivalents). Start and stop dates of other HES medications were checked to ensure that they do no

    Original Secondary Outcome:

    Information By: GlaxoSmithKline

    Dates:
    Date Received: November 22, 2004
    Date Started: September 2004
    Date Completion:
    Last Updated: May 9, 2016
    Last Verified: May 2016