Long-Term Safety and Efficacy of Sirukumab for Patients with Rheumatoid Arthritis Who Previously Received Sirukumab in Randomise
Total Page:16
File Type:pdf, Size:1020Kb
Rheumatoid arthritis RMD Open: first published as 10.1136/rmdopen-2020-001465 on 1 February 2021. Downloaded from ORIGINAL RESEARCH Long-termsafetyandefficacyof sirukumab for patients with rheumatoid arthritiswhopreviouslyreceived sirukumabinrandomisedcontrolled trials (SIRROUND- LTE) Daniel Aletaha ,1 Clifton O Bingham,2 George Athanasios Karpouzas ,3 Tsutomu Takeuchi,4 Carter Thorne,5,6 Androniki Bili,7 Prasheen Agarwal,8 Benjamin Hsu,7 Ravi Rao,9 Kurt Brown,10 Yoshiya Tanaka 11 To cite: Aletaha D, Bingham CO, ABSTRACT Karpouzas GA, et al. Long- Objective Interleukin (IL)-6 is a pleiotropic cytokine Key messages term safety and efficacy of involved in the pathophysiology of rheumatoid arthritis sirukumab for patients with (RA). Sirukumab is a human monoclonal antibody that What is already known about this subject? rheumatoid arthritis who binds to IL-6 with high affinity and specificity. ► Inhibition of interleukin (IL)-6 receptor (IL- 6R) is an previously received sirukumab Methods This long- term extension (LTE) study of the established, effective and safe approach for treat- in randomised controlled trials ment of rheumatoid arthritis (RA). (SIRROUND- LTE). RMD Open SIRROUND- D and SIRROUND- T studies assessed long- term ► The IL-6 cytokine inhibitor sirukumab has been 2021;7:e001465. doi:10.1136/ safety and efficacy of sirukumab in adults with moderate- studied in a pivotal trial programme, and has been rmdopen-2020-001465 to- severe RA refractory to conventional disease- modifying antirheumatic drug therapy or antitumor necrosis shown to be of comparable efficacy and safety to factor agents. Patients received sirukumab 100 mg existing IL-6R inhibitors. Received 29 September 2020 subcutaneously (SC) every 2 weeks (q2w) or sirukumab 50 What does this study add? Revised 5 January 2021 mg SC every 4 weeks (q4w). ► The long- term extension (LTE) study of sirukumab Accepted 9 January 2021 http://rmdopen.bmj.com/ Results 1820 patients enrolled in the LTE; median confirms that reductions in RA signs and symp- exposure was 2.34 and 2.07 years in sirukumab 50 mg toms and improvements in physical function were q4w and 100 mg q2w groups, respectively. Adverse maintained. events (AEs) occurred in similar proportions between ► The safety profile of sirukumab in the LTE remained groups, with the exception of major adverse cardiovascular consistent with that reported in pivotal SIRROUND-D events (MACE), which were more common in the 50 mg and SIRROUND-T trials. q4w versus 100 mg q2w group (2.2% vs 1.0%), and injection- site reactions, more common in the 100 mg How might this impact on clinical practice? q2w group versus 50 mg q4w group (7.5% vs 3.7%). ► Sirukumab has not reached real- life clinical appli- The most common serious AEs were infections (10% of cation, but the current evaluation of the long-term on September 29, 2021 by guest. Protected copyright. the patients); 32 (1.8%) patients died during the study efficacy and particular safety of an IL-6 cytokine in- (primarily from serious infection and MACE). Malignancies hibitor in patients with RA is informative and relevant were reported in 24 (1.3%) patients. Gastrointestinal in a highly dynamic therapeutic field. perforations, hepatobiliary abnormalities and changes in ► The data provided here may serve to further our un- laboratory parameters were rare. Reductions in RA signs derstanding of different modes of action in RA. and symptoms and improvements in physical function were maintained throughout the LTE. © Author(s) (or their Conclusions The safety profile of sirukumab in the TEL employer(s)) 2021. Re- use remained consistent with that reported in SIRROUND- D includes disease- modifying antirheumatic permitted under CC BY- NC. No and SIRROUND- T and efficacy was maintained. drugs (DMARDs), to which many patients do commercial re- use. See rights Trial registration number NCT01856309. 1 and permissions. Published not respond or become intolerant. There- by BMJ. fore, compounds specifically involved in syno- For numbered affiliations see vial inflammation such as tumour necrosis end of article. factor (TNF) and other proinflammatory INTRODUCTION pathway targets have been examined. Correspondence to Professor Daniel Aletaha; Rheumatoid arthritis (RA) is a chronic condi- Interleukin (IL)-6 is a pleiotropic cyto- daniel. aletaha@ meduniwien. tion associated with high rates of pain, disa- kine with proinflammatory functions, which ac. at bility and comorbidity.1 Traditional treatment include differentiation of B and helper T Aletaha D, et al. RMD Open 2021;7:e001465. doi:10.1136/rmdopen-2020-001465 1 RMD Open RMD Open: first published as 10.1136/rmdopen-2020-001465 on 1 February 2021. Downloaded from cells, and is involved in maintaining chronic inflamma- anti- TNF agents or other biologics for RA within the past tion in RA.2 Increased levels of IL-6, IL-1 and TNF have 3 months. been observed in synovial fluid and serum in patients with RA.3 4 Treatments Sirukumab is a human monoclonal antibody directed In SIRROUND- D and SIRROUND- T, patients were against the IL-6 cytokine that inhibits IL-6- mediated randomised 1:1:1 to sirukumab 50 mg every 4 weeks signal transduction.5 6 In two phase III, randomised, (q4w), sirukumab 100 mg every 2 weeks (q2w) or placebo double- blind, placebo- controlled, multicenter studies, delivered subcutaneously (SC). Patients in the placebo sirukumab reduced signs and symptoms of RA, improved group were rerandomised at week 18 (early escape), physical function and health status and inhibited radio- week 24 (crossover in SIRROUND-T only), week 40 (late graphic progression in patients with moderately to escape in SIRROUND-D) or at the crossover at week 52 severely active RA refractory to DMARDs (through 104 (SIRROUND- D only).6 8 Eligible patients from primary weeks; SIRROUND- D)6 7 or anti-TNF agents (through 52 studies remained on their blinded treatment, either weeks; SIRROUND- T).8 In SIRROUND- D, where radio- sirukumab 100 mg SC q2w or sirukumab 50 mg SC q4w graphic progression was examined, sirukumab also inhib- (with q4w placebo injections in between). Treatments ited radiographic progression.6 7 were blinded until: (1) week 52 database lock occurred Since the sirukumab development programme was in SIRROUND- D, (2) week 24 database lock occurred not further pursued based on a strategic decision by the in SIRROUND- T and (3) the last autoinjector usability sponsor, data from these studies and their extension will substudy patient completed week 16 or was terminated likely be the only evidence for long-term efficacy and from the study. Patients in the LTE study randomised in safety of an IL-6 cytokine inhibitor. The primary objective SIRROUND- D remained blinded until all three condi- of this study therefore was to assess and make available the tions occurred. Thereafter, the LTE became open-label; long- term safety of sirukumab in patients with active RA placebo injections were discontinued in the sirukumab refractory or intolerant to DMARDs or anti- TNF agents. 50 mg SC treatment group. Patients treated with siru- kumab 100 mg q2w were offered the option to reduce the dose to 50 mg q4w during the open-label period, after METHODS discussion with their treating rheumatologist. Adverse Study design events (AEs) occurring after patients had switched from This was a multicenter, parallel-group, long- term exten- the 100 mg q2w to the 50 mg q4w group were attributed sion (LTE) study of the SIRROUND- D and SIRROUND- T to the 100 mg q2w group. studies monitoring safety and efficacy of patients with The maximum duration of participation in this study moderately to severely active RA. The full methods and was to be 208 weeks of treatment, followed by approx- results of these studies have been published.6–8 Prior to imately 16 weeks of safety and efficacy follow- up after http://rmdopen.bmj.com/ early study termination, the original intention was to the administration of the final injection of sirukumab. follow enrolled patients for 208 weeks. This study also However, due to the sponsor’s decision to discontinue included a substudy to assess usability of the SmartJect the sirukumab RA programme, the LTE was terminated prefilled syringe autoinjector. early. Patients were scheduled for a final safety follow- up visit at study termination (31 December 2017). Patients For inclusion in this study, patients completed the Evaluations final study agent administrations from the primary Safety was based on reported AEs, clinical laboratory on September 29, 2021 by guest. Protected copyright. studies (week 104 in SIRROUND-D and week 52 in tests, vital sign measurements and physical examina- SIRROUND- T) and provided informed consent. Patients tions. An independent review committee assessed cases were excluded if they had active diverticulitis or any of major adverse cardiovascular events (MACE), and condition that would compromise the well-being of the an independent gastroenterologist reviewed potential patient or preclude protocol- specified assessments. gastrointestinal perforation events. Documentation of For enrolment in SIRROUND- D and SIRROUND- T, events was subject based and not event based. Therefore, patients were ≥18 years of age with moderately to severely the main presentation of AEs is as per cent of subjects active RA.6 8 For SIRROUND-D, patients were refrac- with event from enrolment in the LTE to last observation. tory to single- agent or combination DMARD therapy, However, to put the observed number of subjects with including methotrexate or sulfasalazine, due to lack AEs in context and to allow comparison to other IL6- of benefit after ≥12 weeks as assessed by the treating targeted compounds, we also calculated incidence rates physician. For SIRROUND- T, patients were refrac- per 100 patient- years (PY) for key treatment- emergent tory to previous anti-TNF agents due to an absence of adverse event (TEAE) using the overall exposure time of benefit with ≥1 anti- TNF or documented intolerance to each subject (ie, from first dose to last observation or first 1 anti- TNF.