“PO-83 | Serum diamine oxidase activity in patients with cluster headache: a cross-sectional case–control study: Silvia Boschi,1 Elisa Maria Piella,1 Tilde Manetta,3 Paola Merlach,3 Alberto Mario Chiarandon,1 Alessia Agostinelli,1 Barbara Donati Morello,3 Giulio Mengozzi,3 Innocenzo Rainero,1,2 Elisa Rubino,1,2 | 1Department of Neuroscience ‘Rita Levi Montalcini’, University of Turin, Turin, Italy; 2Headache Center, Department of Neuroscience and Mental Health, AOU Città della Salute e della Scienza di Torino, Turin, Italy; 3Department of Laboratory Medicine, Città della Salute e della Scienza University Hospital, Turin, Italy” (2025) Confinia Cephalalgica [Preprint]. doi:10.4081/cc.2025.15907.