Dr. Ryuji Kubota, M.D., Ph.D., is a Professor in the Division of Neuroimmunology at Kagoshima University’s Joint Research Center for Human Retrovirus Infection. He received both his medical degree and Ph.D. from Kagoshima University and completed research training in neuroimmunology at the U.S. NIH. His research focuses on HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP), with particular emphasis on cytotoxic T cell responses, host–virus interactions, and neuroinflammatory mechanisms. Dr. Kubota has authored over 80 peer-reviewed publications and has led multiple nationally funded projects on immune responses and therapeutic development for HTLV-1-related diseases. His work bridges clinical insight and translational research, contributing to improved understanding and management of retrovirus-associated neuroinflammation.