PO:33:199 | Prevalence and clinical associations of antiphospholipid antibodies in patients with systemic sclerosis in the SPRING-SIR registry: Antonio Tonutti1|2, Ilaria Cavazzana3, Angela Ceribelli1|2, Maria De Santis1|2, Giacomo De Luca4|5, Maria Grazia Lazzaroni3, Franco Franceschini3, Carlo Selmi1|2, Valeria Riccieri6, Silvia Laura Bosello7, Fabio Cacciapaglia8, Veronica Codullo9, Francesca Ingegnoli10, Dilia Giuggioli11, Rossella De Angelis12, Clodoveo Ferri11, Marco Matucci-Cerinic4|5 | 1Department of Biomedical Sciences, Humanitas Universityce Pieve Emanuele, Milan, Italy; 2Rheumatology and Clinical Immunology, IRCCS Humanitas Research Hospital Rozzano, Milan, Italy; 3Rheumatology and Clinical Immunology - ASST Spedali Civili Brescia - Department of Clinical and Experimental Sciences - Brescia, Italy; 4Vita-Salute San Raffaele University Milan, Italy; 5Unit of Immunology, Rheumatology, Allergy and Rare Diseases UnIRAR and INFLAGE Initiative, IRCCS San Raffaele Hospital Milan, Italy; 6University of Rome La Sapienza Rome, Italy; 7Catholic University of Sacred Heart Rome, Italy; 8LUM University Bari, Italy; 9Rheumatology Unit, Fondazione IRCCS Policlinico San Matteo Pavia, Italy; 10University of Milan Milan, Italy; 11University of Modena and Reggio Emilia Modena, Italy; 12Politechnic University of Marche Ancona, Italy. Reumatismo [Internet]. 2026 Mar. 18 [cited 2026 Apr. 17];77(s1). Available from: https://www.reumatismo.org/reuma/article/view/2376