Background:Glucocorticoids (GC), bisphosphonates (BP), non-steroidal anti-inflammatory drugs (NSAID) and classical synthetic or biological disease-modifying antirheumatic drugs (cs/bDMARD) have been employed in the treatment of chronic recurrent multifocal osteomyelitis (CRMO) or chronic non-bacterial osteomyelitis (CNO).1, 2 This one is a rare bone childhood illness and none treatment guidelines have been carried out till present.3Objectives:To asses which treatment schedule employed in CRMO had the best response rates and try to expose a treatment recommendation.Methods:A systematic literature review was made using Medline, Embase, Cochrane library and the Web of Science databases. The search strategy focused on synonyms of CRMO. A prevalence meta-analysis was performed to evaluate each treatment response. Stata 15.1 was used to perform statistical analysis.Results:The search identified 1883 articles, of which 43 were finally selected. Complete response rate reached with NSAIDs was acceptable [50% (CI95% 40-60)]. Lower response rates were reached by GC treatment [44% (CI95% 25-63)] or csDMARD [38% (CI95% 28-48)]. The best complete response rates were reached by bDMARD and BP treatments [69% (CI95% 56-82) and 73% (CI95% 62-84), respectively].Conclusion:This review and meta-analysis supports, taking into account its remission rates and its risk-benefit profile, NSAIDs as potential first-line agents in CRMO treatment. bDMARD and BP have reached the higher remission rates, turning into helpful treatment alternatives. There is not any treatment guidelines driving CRMO patients, but this analysis could help to select a suitable agent for each patient. Decision-making should be individualized.References:[1]Wipff J, Costantino F, Lemelle I, et al. A large national cohort of French patients with chronic recurrent multifocal osteitis. Arthritis & Rheumatol. 2014;67(4):1128-1137.[2]Zhao Y, Wu E Y, Oliver M S, et al. Consensus treatment plans for chronic nonbacterial osteomielitis refractory to nonsteroideal anti-inflammatory drugs and/or with active spinal lesions. Arthritis Care Res. 2018;70(8):1228-1237.[3]Menashe SJ, Aboughalia H, Zhao Y, et al. The many faces of pediatric chronic recurrent multifocal osteomyelitis (CRMO): a practical location- and case-based approach to differenciate CRMO from its mimics. J Magn Reson Imaging. 2020;e27299.Disclosure of Interests:None declared