By Claire Booth, M.B.B.S., F.R.C.P.C.H., M.Sc., Ph.D. Pediatric gene therapy trials for rare diseases are among the most complex studies to execute, placing extraordinary demands on clinical trial sites. From intensive regulatory oversight to long‑term follow‑up and family‑centered care, success depends on far more than clinical expertise alone. In this article, an experienced academic investigator shares practical insights from one of Europe’s leading pediatric gene therapy sites.