Research Study

An Open-Label Compassionate Use Access and Long-Term Access Study of Anti IL-5 (Mepolizumab) Treatment in Subjects With Hypereosinophilic Syndrome
Principal Investigator 
Mark FitzGerald


Body Locations and Systems 
Eosinophilic Disorders 
Study Start/End 
Aug 5, 2015 to May 28, 2020
Diamond Health Care Centre
Linda Hui, Research Nurse
Purpose of Study 

It is thought that from the efficacy and safety information to date, it is possible that subjects with severe or life-threatening HES, and limited treatment options (unresponsive or intolerant to available HES medication), may benefit from mepolizumab treatment. Such subjects will not be able to access mepolizumab through the aforementioned clinical trials due to the severity of their disease. Waiting for regulatory approval would delay access. It is this population of subjects in whom there is a clear unmet medical need, and in whom the benefit to risk ratio is thought appropriate, who will be considered for compassionate use of mepolizumab. This view is echoed by the physicians caring for subjects with HES.

GSK will sponsor this compassionate use trial of mepolizumab to provided access to treatment in subjects determined by their treating physicians to have life threatening HES and in who there is documented failure to at least 3 standard therapies used to treat HES.


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Study Coordinators and Research Nurses cannot give medical advice over the phone. Telephone numbers and email addresses are provided for obtaining additional information on specific clinical research trials only. If you have specific questions which require clinical expertise, please call your primary care physician.