Histiocytosis and Inflammatory Manifestations in Patients with H Syndrome

H syndrome is a rare genetic disorder predisposing to histiocytosis. Our knowledge of the clinical spectrum of these patients is based on case reports and small patient series. Patients with H syndrome have been treated with a range of immunomodulatory and chemotherapeutic agents, with limited success. We aim to comprehensively assess the clinical manifestations and patterns of treatment response in a multinational cohort of patients with H syndrome.