X4 is appointing Dr. Murray Stewart as interim Chief Medical Officer while it conducts a search for a permanent replacement for Dr. Cadavid. Dr. Stewart, who has served as a member of the X4 Board of Directors since March 2019, has had a distinguished career in the life sciences industry, including an 18-year tenure at GlaxoSmithKline (GSK), where he held multiple research and development leadership roles, including Chief Medical Officer, Clinical Head of the Biopharma Unit, and Therapy Area Head for metabolic and cardiovascular diseases. Dr. Stewart also previously served as Chief Medical Officer of Rhythm Pharmaceuticals, leading the successful NDA submission and approval of Imcivree™ (setmelanotide), an innovative treatment for rare causes of obesity.