RT Journal Article SR Electronic T1 Comparative safety and effectiveness of TNF inhibitors, IL6 inhibitors and methotrexate for the treatment of immune checkpoint inhibitor-associated arthritis JF Annals of the Rheumatic Diseases JO Ann Rheum Dis FD BMJ Publishing Group Ltd and European League Against Rheumatism SP 920 OP 926 DO 10.1136/ard-2023-223885 VO 82 IS 7 A1 Bass, Anne R A1 Abdel-Wahab, Noha A1 Reid, Pankti D A1 Sparks, Jeffrey A A1 Calabrese, Cassandra A1 Jannat-Khah, Deanna P A1 Ghosh, Nilasha A1 Rajesh, Divya A1 Aude, Carlos Andres A1 Gedmintas, Lydia A1 MacFarlane, Lindsey A1 Arabelovic, Senada A1 Falohun, Adewunmi A1 Mushtaq, Komal A1 Haj, Farah Al A1 Diab, Adi A1 Shah, Ami A A1 Bingham, Clifton O A1 Chan, Karmela Kim A1 Cappelli, Laura C YR 2023 UL http://ard.bmj.com/content/82/7/920.abstract AB Objectives To compare the safety and effectiveness of biologic and conventional disease-modifying antirheumatic drugs (DMARDs) for immune checkpoint inhibitor-associated inflammatory arthritis (ICI-IA).Methods The retrospective multicentre observational study included patients with a diagnosis of ICI-IA treated with a tumour necrosis factor inhibitor (TNFi), interleukin-6 receptor inhibitor (IL6Ri) and/or methotrexate (MTX); patients with pre-existing autoimmune disease were excluded. The primary outcome was time to cancer progression from ICI initiation; the secondary outcome was time to arthritis control from DMARD initiation. Cox proportional hazard models were used to compare medication groups, adjusting for confounders.Results 147 patients were included (mean age 60.3 (SD 11.9) years, 66 (45%) women). ICI-IA treatment was TNFi in 33 (22%), IL6Ri 42 (29%) and MTX 72 (49%). After adjustment for time from ICI initiation to DMARD initiation, time to cancer progression was significantly shorter for TNFi compared with MTX (HR 3.27 (95% CI 1.21 to 8.84, p=0.019)) while the result for IL6Ri was HR 2.37 (95% CI 0.94 to 5.98, p=0.055). Time to arthritis control was faster for TNFi compared with MTX (HR 1.91 (95% CI 1.06 to 3.45, p=0.032)) while the result for IL6Ri was HR 1.66 (95% CI 0.93 to 2.97, p=0.089). A subset analysis in patients with melanoma gave similar results for both cancer progression and arthritis control.Conclusion The treatment of ICI-IA with a biologic DMARD is associated with more rapid arthritis control than with MTX, but may be associated with a shorter time to cancer progression.No data are available. All data relevant to the study are included in the article or uploaded as an online supplemental information.