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Background In Europe, IL-17A blocker secukinumab is approved for ankylosing spondylitis (AS). The label dose is 150mg: loading dose regimen at weeks 0, 1, 2, 3 and 4, followed by monthly maintenance dosing. 300mg dose is not indicated for AS. Secukinumab is not yet approved for non-radiographic axial spondyloarthritis (nr-axSpA). Objectives: Describe real-world dose utilization of an IL-17A blocker among axial spondyloarthritis (axSpA) patients with radiographic (AS) and nr-axSpA. Methods Descriptive, cross-sectional survey of physicians managing axSpA (France, Germany, Italy, Spain, UK, Austria &amp; Australia). At the time of survey (April-August 2019), only secukinumab was approved. Physicians completed patient record forms for their next 7 consulting patients currently treated with or discontinued secukinumab, recording demographics, disease activity (Bath Ankylosing Spondylitis Disease Activity Index, BASDAI), Ankylosing Spondylitis Disease Activity Score, ASDAS) and treatment history. Results 275 rheumatologists and 4 orthopedists provided data for 2,101 patients: 1,509 (1151 AS; 358 nr-axSpA) currently receiving secukinumab and 592 (385 AS; 207 nr-axSpA) secukinumab discontinuers. Mean age was 45.1years (45.8 AS; 43.2 nr-axSpA), 64.4% were male (68.8% AS, 52.4% nr-axSpA), and mean time diagnosed was 5.3years (5.9 AS; 3.8 nr-axSpA). 50.5% (48.4% AS; 55.9% nr-axSpA) of patients were receiving secukinumab as their first biologic, 48.4% biologic-experienced. 94.1% (93.9% AS; 94.3% nr-axSpA) of all users were treated beyond loading dose phase of secukinumab; 8.8% dose up-titrated from 150mg to 300mg. Of patients currently receiving secukinumab maintenance, median treatment duration was 44.4weeks (n = 1249). 71.5% (71.4% AS; 72.3% nr-axSpA) received 150mg monthly, 28.5% received a dose outside label (23.7% on 300mg). For discontinuers who reached maintenance phase, median treatment duration was 20.0weeks (n = 547). 38.7% (37.4% AS; 41.3% nr-axSpA) of secukinumab discontinuers received a dose outside label (33.9% on 300mg). 30.5% (28.8% AS; 36.1% nr-axSpA) of biologic-experienced patients received secukinumab 300mg. The utilization of secukinumab 300mg in biologic-experienced discontinuers was 36.9% and higher than in current biologic-experienced users (28.0%). At initiation of secukinumab 150mg, 95.1% and 90.7% of patients had BASDAI≥4 (n = 593) and ASDAS≥2.1 (n = 129), respectively. For those continuing, after a median duration of 42.3weeks, 31.7% (30.4% AS; 35.7% nr-axSpA) had BASDAI≥4 and 30.2% (27.8% AS; 37.5% nr-axSpA) ASDAS≥2.1. At initiation of secukinumab 300mg, 93.1% and 96.4% had BASDAI≥4 (n = 173) and ASDAS≥2.1 (n = 28), respectively. For those continuing, after median duration of 51.9weeks, 42.2% (38.2% AS; 54.8% nr-axSpA) had BASDAI≥4 and 57.1% (52.4% AS; 71.4% nr-axSpA) ASDAS≥2.1. Conclusion In the real-world, secukinumab discontinuation occurred after 20.0weeks, despite approximately one third being treated with secukinumab 300mg. For those remaining on secukinumab, up to 30% used outside-label doses (higher in biologic-experienced patients). Secukinumab is not universally prescribed for the approved indication or at the recommended dose. There is a suggestion that not all patients receiving a higher dose achieve low disease activity. Disclosures N. Booth: Grants/research support; Research was funded by eli-lilly and company. Other; Employed by Adelphi Real World. J. Hill: Other; Employed by Eli Lilly and company. S. Leage: Other; Employed by Eli Lilly and company. C. Sapin: Other; Employed by Eli Lilly and company. E. Holdsworth: Other; Employed by Adelphi Real World. S. Antonelli: Other; Employed by Eli Lilly and company.

P278 Real-world experience with an IL-17A blocker in biologic-naïve and biologic-experienced radiographic and non-radiographic axSpA patients