Florence Roufosse, MD-PhD, Group Leader, Institute for Medical Immunology, and Associate Professor, Department of Internal Medicine, Hôpital Erasme, Faculty of Medicine, Université Libre de Bruxelles, recently reviewed new advances on the pathogenesis and treatment of the hypereosinophilic syndrome. The publication in the Orphanet Journal of Rare Diseases was the second most accessed article in this journal with more than 1000 electronic downloads during the last month. Published: October 26, 2007