Dr. Erwan Treillet is a clinical researcher and author specializing in pain medicine, palliative care, and supportive oncology, with a strong focus on complex cancer pain, opioid optimization, and innovative neuromodulation strategies. His scholarly work addresses refractory pain, methadone use, opioid rotation, ketamine, sedation practices at end of life, and real-world evidence in chronic pain conditions such as fibromyalgia and osteoarthritis. He has contributed to prospective multicentre studies, phase III clinical trials, national guideline development, and interdisciplinary research integrating medicine, technology, and supportive care. His publications include original research articles, narrative and systematic reviews, real world evidence studies, and authoritative book chapters that inform both clinical practice and policy. Dr. Treillet’s research emphasizes patient-centered outcomes, quality of life, and evidence-based analgesic strategies in complex clinical settings, 21 peer-reviewed documents, 134 citations, and an h-index of 4, reflecting sustained academic impact in the field of pain and palliative medicine.