A team of researchers have evaluated mepolizumab, a new antibody-based drug for certain patients with severe asthma, and found it can replace traditional, steroid-based treatments for a specific subset of patients, resulting in improved outcomes and reduced side effects.

Patients with severe asthma often require high doses of steroid-based treatments that can significantly impair their quality of life.

These high doses can cause debilitating side effects including mood swings, diabetes, bone loss, skin bruising, cataracts and hypertension.
Previous research at the Hamilton institutions has identified specific types of patient with severe asthma have an overabundance of a particular type of white blood cell (eosinophils) present in their sputum.

These patients often suffer from the most severe asthma symptoms and can only be treated through steroid-based medications such as prednisone.
 

The study in the New England Journal of Medicine was led in Canada by Dr. Parameswaran Nair, staff respirologist, Firestone Institute for Respiratory Health at St. Joseph's Healthcare Hamilton and professor of respirology at the Michael G. DeGroote School of Medicine at McMaster University. Dr. Nair and his colleagues recruited the largest number of participants for this global study.

"This new drug is the only therapy that has been proven to be effective in well-established clinical trials to help reduce doses of steroid-based treatments such as prednisone for those with severe asthma," said Dr. Nair, adding that the paper reconfirms the team's observation published in the New England Journal of Medicine in 2009.

"This is an exciting example of personalized medicine for asthma," said Nair. "This discovery now tells us by using a simple blood or sputum eosinophil count, we can identify which asthma patients can benefit from this new treatment.