Eric Oksenhendler, MD, is a Professor in the department of Clinical Immunology at Hopital Saint-Louis in Paris. He has 14 years experience with registry management in Primary Immune Deficiency (> 900 patients) and French national registry for all types of Castleman disease (> 350 patients). He has been one of the leading experts worldwide in the elucidation and description of HHV-8-associated MCD.