“PO-66 | Predicting the Evolution to Resistant and Refractory Migraine: a Machine Learning Analysis from the REFINE Study: Chiara Rosignoli,1 Raffaele Ornello,1 Daniele Lozzi,2 Enrico Mattei,2 Federico De Santis,1 Agnese Onofri,1 Mark Braschinsky,3 Christian Lampl,4 Isabel Pavão Martins,5 Paolo Martelletti,6 Dimos Mitsikostas,7 Raquel Gil-Gouveia,8 Maria Pia Prudenzano,9 Kristina Ryliskiene,10 Margarita Sanchez Del Rio,11 Patricia Pozo-Rosich,12 Aynur Özge,13 Fabrizio Vernieri,14 Marta Waliszewska-Prosół,15 Zaza Katsarava,16 Giuseppe Placidi,2 Simona Sacco1 | 1Dept. of Biotechnological and Applied Clinical Sciences, University of L’Aquila, Italy; 2A²VI-Lab, Dept. MeSVA University of L’Aquila; 3Dept. of Neurology and Neurosurgery, Institute of Clinical Medicine, Faculty of Medicine, University of Tartu, Estonia; 4Headache Medical Center, Seilerstaette Linz, Austria. Center; 5Headache Center, Hospital Da Luz, Lisbon, Portugal; 6School of Health, Unitelma Sapienza University of Rome, Italy; 7First Dept of Neurology, Aeginition Hospital, National and Kapodistrian University of Athens, Greece; 8Centro De Estudos Egas Moniz, Faculty of Medicine, University of Lisbon, Portugal; 9Headache Center, Amaducci Neurological Clinic, Policlinico General Hospital, Bari, Italy; 10Center of Neurology, Vilnius University, Lithuania; 11Dept. of Neurology, Clínica Universidad De Navarra, Madrid, Spain; 12Neurology Department, Hospital Universitari Vall d’Hebron, Barcelona, Spain; 13Dept. of Neurology, Mersin University Medical Faculty, Mersin, Turkey; 14Università Policlinico Campus Bio-Medico, Rome, Italy; 15Dept. Of Neurology, Wroclaw Medical University, Wrocław, Poland; 16Dept of Neurology, Christian Hospital Unna and University of Duisburg-Essen, Ruhr Metropolitan, Germany”. 2025. Confinia Cephalalgica 35 (S1). https://doi.org/10.4081/cc.2025.15889.