Real-world single centre use of JAK inhibitors across the rheumatoid arthritis pathway.

OBJECTIVES: To evaluate real-world efficacy of approved JAK inhibitors (JAKi) tofacitinib and baricitinib in a large, single-centre cohort of RA patients across the treatment pathway, including those refractory to multiple biologic drugs. METHODS: All RA patients, treated with tofacitinib (from time of compassionate access scheme) or baricitinib since approval in 2017 had DAS28-CRP scores and components recorded at baseline, 3 and 6 months (with retrospective data for compassionate access scheme). Efficacy was evaluated in the total cohort, each treatment group, and subgroups of number of prior biologic classes failed. RESULTS: One hundred and fifteen patients were treated with a JAKi (tofacitinib 54, baricitinib 69, 8 both); 76.4% female; mean (s.d.) age 57.3 (14.3) years. On average patients had received three previous bDMARDs; 11 (9.6%) were bDMARD naïve. Combined group baseline DAS28-CRP (s.d.) 5.62(1.14) improved by 1.49(1.44) and 1.67(1.61) at 3 and 6 months, respectively, comparable in individual JAKi groups; with 24% in at least low disease activity at 3 months. The biggest improvement was observed in the biologic-naïve group (mean DAS28-CRP improved from 5.16-2.14 after 6 months); while those with prior exposure to minimum three bDMARD classes had DAS28-CRP improvement of >1.2. Five out of 8 patients treated with both JAKi sequentially responded. Twelve patients previously unresponsive to IL-6 blockade responded to JAKi. No unexpected safety events were recorded. Two cases of venous thromboembolism were observed. CONCLUSION: JAK inhibition is effective in a real-world population of RA patients, including in a subset of patients refractory to multiple previous bDMARDs.

Real-world experience of effectiveness of non-medical switch from originator to biosimilar rituximab in rheumatoid arthritis.

OBJECTIVE: To evaluate the impact of non-medical switch from rituximab originator (RTX-O) to biosimilar (RTX-B) in patients with RA. METHODS: Between October 2017 and October 2019, all patients on RTX-O in our centre requiring re-treatment were switched to RTX-B unless declined by the patient or specified by the treating clinician. Switch strategy effectiveness was assessed retrospectively using DAS28-CRP(3) and RTX retention, with patients remaining on RTX-O as a comparator group. RESULTS: The number of patients switching to RTX-B was 255/337 (75.7%) while 82 (24.3%) remained on RTX-O. There was no difference in DAS28-CRP(3) 4 months post-RTX-B switch vs the same time point post-RTX-O previous cycle (paired data available in 60%). Eighteen-month retention estimates were 75.6% (95% CI: 69.4, 80.7%) for RTX-B group and 82.3% (95% CI: 70.4, 89.8%) for RTX-O [adjusted hazard ratio 1.52 (95% CI: 0.85, 2.73)]. The number of patients who discontinued RTX-B for loss of effectiveness (LOE) was 42/255 (16.5%), five (2.0%) for adverse effects (AEs). Risk of RTX-B discontinuation was associated with comorbidities and ≥2 previous biologic DMARDs. Risk of adverse outcome RTX cessation was associated with comorbidities, and reduced risk with number of previous RTX-O cycles and pre-switch cycle B cell depletion. The number of patients who switched back to RTX-O was 34/255 (13.3%) (LOE: 30, AEs: 4), while 13/255 (5.1%) started other biologic/targeted synthetic DMARDs. Of patients who switched back for LOE, 28/30 remained on RTX-O at a mean 7.7 months follow-up. CONCLUSION: Non-medical switch to RTX-B was largely effective. Factors associated with RTX-B discontinuation, including comorbidities, previous biologic DMARDs, and RTX-O treatment history, may inform switch decisions. Most patients who switched back to RTX-O for LOE remained on treatment at short-term follow-up.

Single-centre experience of refractory rheumatoid arthritis.

Objectives: The aim was to evaluate the proportion of RA patients who are refractory to multiple targeted therapies (TTs) in a real-world cohort of patients in a tertiary rheumatology referral centre, to describe patterns of drug sequencing associated with the development of refractory RA (RefRA) and to identify whether there is a subgroup of RefRA patients in whom successive drugs have shown primary lack of efficacy. Methods: Patients at a single centre were defined as refractory if they had failed two or more classes of TT and were identified from a dedicated TT clinic database. Reasons for drug failure were recorded, and patients were categorized pragmatically as having mild [failure of two biologic DMARD (bDMARD) classes], moderate [failure of at least three bDMARD classes] or severe [failure of at least two bDMARD classes and JAK inhibitor] refractory disease. Results: One hundred and seventy-two patients were identified as RefRA (>10% of our TT-exposed cohort); median [interquartile range (IQR)] TT exposures of four (two), 81.5% female, 82% seropositive, mean (s.d.) age of 63 (12.3) years. Detailed analysis of 60 patients showed a median (IQR) disease duration of 22 (10.75) years, median (IQR) time from diagnosis to initiation of first TT of 5 (10) years, and mean (s.d.) baseline DAS28CRP before starting first-line TT of 5.91 (0.84). Among RefRA patients, 15% were severely refractory, and 6% had demonstrated no clinical response to any TT. Conclusion: A small proportion of patients have true RefRA. Most patients fail multiple therapies owing to a combination of inefficacy and adverse events.

A Large Cluster of New Onset Autoimmune Myositis in the Yorkshire Region Following SARS-CoV-2 Vaccination.

BACKGROUND: The novel SARS-CoV-2 vaccines partially exploit intrinsic DNA or RNA adjuvanticity, with dysregulation in the metabolism of both these nucleic acids independently linked to triggering experimental autoimmune diseases, including lupus and myositis. METHODS: Herein, we present 15 new onset autoimmune myositis temporally associated with SARS-CoV-2 RNA or DNA-based vaccines that occurred between February 2021 and April 2022. Musculoskeletal, pulmonary, cutaneous and cardiac manifestations, laboratory and imaging data were collected. RESULTS: In total, 15 cases of new onset myositis (11 polymyositis/necrotizing/overlap myositis; 4 dermatomyositis) were identified in the Yorkshire region of approximately 5.6 million people, between February 2021 and April 2022 (10 females/5 men; mean age was 66.1 years; range 37-83). New onset disease occurred after first vaccination (5 cases), second vaccination (7 cases) or after the third dose (3 cases), which was often a different vaccine. Of the cases, 6 had systemic complications including skin (3 cases), lung (3 cases), heart (2 cases) and 10/15 had myositis associated autoantibodies. All but 1 case had good therapy responses. Adverse event following immunization (AEFI) could not be explained based on the underlying disease/co-morbidities. CONCLUSION: Compared with our usual regional Rheumatology clinical experience, a surprisingly large number of new onset myositis cases presented during the period of observation. Given that antigen release inevitably follows muscle injury and given the role of nucleic acid adjuvanticity in autoimmunity and muscle disease, further longitudinal studies are required to explore potential links between novel coronavirus vaccines and myositis in comparison with more traditional vaccine methods.

Mixed results with baricitinib in biological-resistant adult-onset Still's disease and undifferentiated systemic autoinflammatory disease.

This clinical case series describes our experience with the use of Janus kinase 1/2 inhibitor baricitinib in two patients suffering from refractory adult-onset Still's disease (AOSD) as well as in one case suffering from AOSD-like autoinflammatory disease in the context of myelodysplastic syndrome. All patients suffered from disease non-responsive to conventional Disease-modifying antirheumatic drugs (DMARDs) as well as biological therapies including interleukin (IL)-1 and IL-6 blockade, relying instead on high daily doses of prednisolone. We also report the first case of Pneumocystis jirovecii infection following baricitinib use.

GP2015 as a promising therapy for rheumatoid arthritis.

INTRODUCTION: Rheumatoid arthritis is a common inflammatory joint disease with a myriad of systemic manifestations. Over the last 20 years its treatment has been revolutionised by the introduction of a number of different biologic drugs, including the TNF-receptor Fc fusion protein, Etanercept. However, these drugs are expensive and their widespread use puts a financial burden on healthcare systems. As many biologic treatments begin to come off patent new 'biosimilar' versions are being developed which can lead to significant cost savings. GP2015 (Erelzi®) is the second biosimilar version of Etanercept which is licensed for the treatment of rheumatoid arthritis. Areas covered: We discuss the Chemistry, pharmacokinetics and pharmacodynamics of GP2015 in relation to reference Etanercept. Preclinical trials have shown pharmacokinetic equivalence between GP2015 and the reference drug. The recently completed Phase III, randomised, double blind EQUIRA study has shown equivalent efficacy and safety between GP2015 and Etanercept in patients with rheumatoid arthritis. Expert opinion: GP2015 has shown equivalent efficacy and safety to reference Etanercept. With a growing number of biosimilar medications becoming available and another biosimilar Etanercept already being widely prescribed it is likely to be the cost of the drug that will determine if it is used widely.

Galectin 3 induces a distinctive pattern of cytokine and chemokine production in rheumatoid synovial fibroblasts via selective signaling pathways.

OBJECTIVE: High expression of galectin 3 at sites of joint destruction in rheumatoid arthritis (RA) suggests that galectin 3 plays a role in RA pathogenesis. Previous studies have demonstrated the effects of galectins on immune cells, such as lymphocytes and macrophages. This study was undertaken to investigate the hypothesis that galectin 3 induces proinflammatory effects in RA by modulating the pattern of cytokine and chemokine production in synovial fibroblasts. METHODS: Matched samples of RA synovial and skin fibroblasts were pretreated with galectin 3 or tumor necrosis factor alpha (TNFalpha), and the levels of a panel of cytokines, chemokines, and matrix metalloproteinases (MMPs) were determined using enzyme-linked immunosorbent assays and multiplex assays. Specific inhibitors were used to dissect signaling pathways, which were confirmed by Western blotting and NF-kappaB activation assay. RESULTS: Galectin 3 induced secretion of interleukin-6 (IL-6), granulocyte-macrophage colony-stimulating factor, CXCL8, and MMP-3 in both synovial and skin fibroblasts. By contrast, galectin 3-induced secretion of TNFalpha, CCL2, CCL3, and CCL5 was significantly greater in synovial fibroblasts than in skin fibroblasts. TNFalpha blockade ruled out autocrine TNFalpha-stimulated induction of chemokines. The MAPKs p38, JNK, and ERK were necessary for IL-6 production, but phosphatidylinositol 3-kinase (PI 3-kinase) was required for selective CCL5 induction. NF-kappaB activation was required for production of both IL-6 and CCL5. CONCLUSION: Our findings indicate that galectin 3 promotes proinflammatory cytokine secretion by tissue fibroblasts. However, galectin 3 induces the production of mononuclear cell-recruiting chemokines uniquely from synovial fibroblasts, but not matched skin fibroblasts, via a PI 3-kinase signaling pathway. These data provide further evidence of the role of synovial fibroblasts in regulating the pattern and persistence of the inflammatory infiltrate in RA and suggest a new and important functional consequence of the observed high expression of galectin 3 in the rheumatoid synovium.