Oncotelic Inc., a wholly owned subsidiary of Mateon Therapeutics Inc. announced that Dr. John H. Sampson has joined its Medical Advisory Board (MAB). Dr. Sampson will provide expert advice and strategic guidance to advance the clinical development of the lead anti-brain tumor drug candidate of Oncotelic. John H. Sampson, M.D., Ph.D., is the Robert H. and Gloria Wilkins Distinguished Professor and Chair of the Department of Neurosurgery at Duke University School of Medicine as well as the Co-Leader of the Duke Cancer Institute’s Neuro-Oncology Program.