The efficacy of inhibiting tumour necrosis factor alpha and interleukin 1 in patients with rheumatoid arthritis: a meta-analysis and adjusted indirect comparisons

Cytokine Inhibitors Upregulate Extracellular Matrix Anabolism of Human Intervertebral Discs under Alginate Beads and Alginate-Embedded Explant Cultures

We investigated the effects of the cytokine inhibitors IL-1 receptor antagonist (IL-1Ra) and soluble tumor necrosis factor receptor-1 (sTNFR1) on the extracellular matrix metabolism of human intervertebral discs (IVDs) and the roles of IL-1β and TNF in the homeostasis of IVD cells. The 1.2% alginate beads and the explants obtained from 35 human lumbar discs were treated with cytokine inhibitors. Extracellular matrix metabolism was evaluated by proteoglycan (PG) and collagen syntheses and IL-1β, TNF, and IL-6 expressions after three days of culture in the presence or absence of IL-1Ra, sTNFR1, and cycloheximide. Simultaneous treatment with IL-1Ra and sTNFR1 stimulated PG and collagen syntheses in the NP and AF cells and explants. The IL-1β concentration was significantly correlated to the relative increase in PG synthesis in AF explants after simultaneous cytokine inhibitor treatment. The relative increase in PG synthesis induced by simultaneous cytokine treatment was significantly higher in an advanced grade of MRI. Expressions of IL-1β and TNF were upregulated by each cytokine inhibitor, and simultaneous treatment suppressed IL-1β and TNF productions. In conclusion, IL-1Ra and sTNFR1 have the potential to increase PG and collagen synthesis in IVDs. IL-1β and TNF have a feedback pathway to maintain optimal expression, resulting in the control of homeostasis in IVD explants.

The beneficial effect of csDMARDs co-medication on drug persistence of first-line TNF inhibitor in rheumatoid arthritis patients: data from Czech ATTRA registry

The study aimed to compare treatment retention for first-line TNF inhibitor (TNFi) in the ATTRA registry patients receiving either combination with conventional synthetic DMARDs or TNFi as monotherapy. A retrospective multicenter study analyzed data of all adult patients with rheumatoid arthritis (n = 3032) starting TNF inhibitor as the first-line biological therapy in combination with csDMARDs or in monotherapy from January 1st 2012 to December 31st 2020. Kaplan-Meier method was employed to calculate drug retentions. Survival curves of treatment retentions were compared through Log-rank test between the studied subgroups. The hazard ratio for drug discontinuation was assessed through univariate cox regression models. In patients who started the first line TNFi therapy, the median treatment retention was 47.7 (42.2; 53.1) months for combination therapy and 22.7 (14.9; 30.6) months for TNFi monotherapy (p < 0.001). Estimated one-year survival was higher in patients on TNFi combined with csDMARDs as compared with TNFi monotherapy (75.3% vs 65.7%); two-year survival rate was 63.2% vs 49.2%, three-year survival rate was 55.4% vs 42.4% and five-year survival 44.9% vs 26.4% of patients. The estimated survival on the first TNFi was higher in patients taking combination therapy with methotrexate than with other csDMARDs (p = 0.003). Use of csDMARDs co-medication was associated with significantly better first TNFi drug survival compared to monotherapy. The combination of TNFi with MTX is more effective than the combination with leflunomide, which did not demonstrate a significant effect.

Immunosuppression in Rheumatologic and Auto-immune Disease

Many rheumatologic diseases are thought to originate in dysregulation of the immune system; lupus nephritis, for example, involves humoral immunity, while autoinflammatory diseases such as familial Mediterranean fever are caused by defects in innate immunity. Of note, this dysregulation may involve both upregulation of immune system components and aspects of immunodeficiency. Treatment of rheumatologic diseases thus requires a familiarity with a variety of immunosuppressive medications and their effects on immune system function.In many rheumatologic conditions, due to an incompletely elucidated mechanism of disease, immunosuppression is relatively broad in contrast to agents used, for example, in treatment of transplant rejection. Multiple immunosuppressive drugs may also be used in succession or in combination. As such, an understanding of the mechanisms and targets of immunosuppressive drugs is essential to appreciating their utility and potential adverse effects. Because of the overlap between therapies used in rheumatologic as well as other inflammatory disorders, some of these medications are discussed in other disease processes (e.g., Immunosuppression for inflammatory bowel disease) or in greater detail in other chapters of this textbook (corticosteroids, mTOR inhibitors, antiproliferative agents).

Real-Life Retention Rates and Reasons for Switching of Biological DMARDs in Rheumatoid Arthritis, Psoriatic Arthritis, and Ankylosing Spondylitis

Aims: To determine real-life biologic/targeted synthetic disease-modifying anti-rheumatic drug (b/tsDMARD) retention rates in rheumatoid arthritis (RA), psoriatic arthritis (PsA), and ankylosing spondylitis (AS), explore reasons for switching and to compare results to previously published data.

Methods: Time-to-event analysis for mean treatment duration (estimated as the Restricted Mean Survival Time), b/tsDMARD failure, and b/tsDMARDs switching was performed for 230 patients (n = 147 RA, 46 PsA, 37 AS) who commenced their first b/tsDMARD between 2008 and 2018. Patients were managed in a dedicated “biologics” clinic in a tertiary hospital; the choice of b/tsDMARD was clinician driven based on medical factors and patient preferences. The effect of covariates on switching risk was analysed by a conditional risk-set Cox proportional-hazards model. Treatment retention data was compared to a historical analysis (2002–2008).

Results: The proportions remaining on treatment (retention) were similar, throughout follow-up, for the first, second and third b/tsDMARDs across all patients (p = 0.46). When compared to RA patients, the risk of b/tsDMARD failure was halved in PsA patients [Hazard Ratio (HR) = 0.50], but no different in AS patients (HR = 1.0). The respective restricted mean (95%CI) treatment durations, estimated at 5 years of follow-up, were 3.1 (2.9, 3.4), 4.1 (3.7, 4.6), and 3.3 (2.8, 3.9) years, for RA, PsA, and AS, respectively. Age, gender, disease duration, smoking status and the use of concomitant csDMARDS were not associated with the risk of bDMARD failure. The most common reasons for switching in the first and subsequent years were secondary (n = 62) and primary (n = 35) failure. Comparison with historical data indicated no substantive differences in switching of the first biologic for RA and PsA.

Conclusion: Similar retention rates of the second and third compared to the first b/tsDMARD in RA, PsA, and AS support a strategy of differential b/tsDMARDs use informed by patient presentation. Despite greater availability of b/tsDMARDs with differing mechanisms of action, retention rates of the first b/tsDMARD remain similar to previous years.

Flare-up of cytokines in rheumatoid arthritis and their role in triggering depression: Shared common function and their possible applications in treatment (Review)

Chronic illnesses are associated with an increased risk of depression and anxiety. Rheumatoid arthritis (RA) is a chronic autoimmune disease that typically causes damage to the joints. RA extensively impacts patients, both physically and psychologically. Depression is a common comorbid disorder with RA, which leads to worsened health outcomes. There are several cytokines that are active in the joints of patients with RA. Inflammatory cytokines serve important roles in the key processes in the joints, which usually cause inflammation, articular damage and other comorbidities associated with RA. The key role of inflammatory cytokines could be attributed to their interactions within signaling pathways. In RA, IL-1, and the cytokines of TNF-α, IL-6 and IL-18 are primarily involved. Furthermore, depression is hypothesized to be strongly associated with systemic inflammation, particularly with dysregulation of the cytokine network. The present review summarizes the current state of knowledge on these two diseases from the perspective of inflammation and cytokines, and emphasizes the possible bridge between them by exploring the involvement of systemic cytokines in both conditions.

Rhoifolin regulates oxidative stress and proinflammatory cytokine levels in Freund's adjuvant-induced rheumatoid arthritis via inhibition of NF-κB

Rheumatoid arthritis (RA) is an autoimmune disease of knee joints involving pain and inflammation. Rhoifolin is a plant flavonoid known to have antioxidant and anti-inflammatory properties. This study was taken to identify the effect of rhoifolin on complete Freund’s adjuvant (CFA)-induced arthritis in the rat model. Treatment with rhoifolin (10 and 20 mg/kg) showed a significant improvement in the overall health parameters such as paw edema and weight loss. This improvement in morphological parameters corroborated the findings with gross morphological changes observed in the histopathological analysis. Rhoifolin treatment also caused a significant decrease in oxidative stress, evident from changes in intracellular levels of glutathione, glutathione peroxidase, malondialdehyde, and superoxide dismutase in the articular cartilage tissue. Moreover, proinflammatory cytokines, tumor necrosis factor (TNF)-α, interleukin(IL)-1β, and IL-6 showed a significant downregulation of gene expression and intracellular protein concentration levels. The NF-κB pathway showed a significant attenuation as evident in the significant reduction in the levels of NF-κB p65 and p-IκB-α. These results indicated that rhoifolin can be a natural therapeutic alternative to the extant regimens, which include non-steroidal anti-inflammatory drugs and immunosuppressants. Additionally, the antioxidant and anti-inflammatory action of rhoifolin was probably mediated by the NF-κB pathway. However, the exact target molecules of this pathway need to be determined in further studies.

Altering the natural history of rheumatoid arthritis: The role of immunotherapy and biologics in orthopaedic care

Rheumatoid Arthritis (RA) is an idiopathic disease characterized by systemic inflammation, persistent synovitis, and the presence of autoantibodies. Because of the musculoskeletal deformity caused by RA, multiple orthopaedic procedures are regularly performed as part of the treatment. The changing rates of surgery and the rise in new efficacious medical therapy have improved the prognosis for patients with RA. This review will discuss the natural history of rheumatoid arthritis, common medications used to treat it, how disease progression has changed as a function of new biologic immunotherapy, and the role of orthopaedic intervention in this new landscape of advanced rheumatoid care.

Efficacy and safety of interleukin-1 antagonists in rheumatoid arthritis: a systematic review and meta-analysis

Rheumatoid arthritis patients have a high level of pro-inflammatory interleukin-1. Augmenting the blockade of interleukin-1 receptors by external interleukin-1 receptor antagonist modifies the progression of the disease. Therefore, the aim of this study was to evaluate the clinical efficacy and safety of interleukin-1 receptor antagonist (anakinra) in the treatment of rheumatoid arthritis. Clinical trials and extension studies that compared anakinra with placebo or other medications were included. Electronic bibliographic databases: PubMed, Scopus, and Web of Sciences were searched from inception to November 2017. The American College of Rheumatology 20% (ACR20) improvement was the primary efficacy outcome measure. Total number of adverse drug events, serious adverse drug events, total treatment withdrawals, and treatment-related withdrawals were safety outcome measures. Ten studies were included in this review. One study did not fulfil quantitative criteria and was assessed qualitatively. Six clinical trials and three extension studies were included in meta-analysis. Patients treated with anakinra are 42% more likely to have ACR20 response than patients without IL-1Ra (pooled RR 1.42; 95% CI 1.01, 2.00). Patients on 30-150 mg anakinra have lower Health Assessment Questionnaire (HAQ) score than patients without IL-1Ra (SMD - 0.28; 95% CI - 0.53, - 0.03). The inflammatory marker erythrocyte sedimentation rate (ESR) was significantly lower among patients treated with 30-150 mg anakinra (SMD - 0.44; 95% CI - 0.65, - 0.23). Patients on anakinra have a 34% more risk of treatment-related withdrawal than placebo. The other parameters were not found to be statistically significant. Anakinra has a significant improvement in ACR20, HAQ, and ESR. The ACR20 response is maintained after 48 weeks of treatment. Anakinra shows higher episodes of treatment-related withdrawals than placebo.

Effects of a Web-Based Patient Decision Aid on Biologic and Small-Molecule Agents for Rheumatoid Arthritis: Results From a Proof-of-Concept Study

OBJECTIVE

To assess the extent to which ANSWER-2, an interactive online patient decision aid, reduces patients' decisional conflict and improves their medication-related knowledge and self-management capacity.

METHODS

We used a pre-post study design. Eligible participants had a diagnosis of rheumatoid arthritis (RA), had been recommended to start using a biologic agent or small-molecule agent or to switch to a new one, and had internet access. Access to ANSWER-2 was provided immediately after enrollment. Outcome measures included 1) the Decisional Conflict Scale (DCS), 2) the Medication Education Impact Questionnaire (MeiQ), and 3) the Partners in Health Scale (PIHS). A paired t-test was used to assess differences pre- and postintervention.

RESULTS

The majority of the 50 participants were women (n = 40), and the mean ± SD age of participants was 49.6 ± 12.2 years. The median disease duration was 5 years (25th, 75th percentile: 2, 10 years). The mean ± SD DCS score was 45.9 ± 25.1 preintervention and 25.1 ± 21.8 postintervention (mean change of -21.2 of 100 [95% confidence interval (95% CI) -28.1, -14.4], P < 0.001). Before using ANSWER-2, 20% of participants had a DCS score of <25, compared to 52% of participants after the intervention. Similar results were observed in the PIHS (mean ± SD 25.3 ± 14.8 preintervention and 20.4 ± 13.0 postintervention; mean change of -3.7 of 88 [95% CI -6.3, -1.0], P = 0.009). Findings from the MeiQ were mixed, with statistically significant differences found only in the self-management subscales.

CONCLUSION

Patients' decisional conflict decreased and perceived self-management capacity improved after using ANSWER-2. Future research comparing the effectiveness of ANSWER-2 with that of educational material on biologic agents will provide further insight into its value in RA management.

Rutin Attenuates Oxidative Stress and Proinflammatory Cytokine Level in Adjuvant Induced Rheumatoid Arthritis via Inhibition of NF-κB

The present study was intended to elucidate the effect of rutin, a flavonoid, on arthritis in complete Freund's adjuvant-induced arthritic rats. The present study showed that more pronounced effect has been observed in the case of 15 mg/kg dose of rutin, with significant reduction in paw diameter together with positive modulation of hematological parameters as compared to 2 other tested doses. A significant upsurge in the level of superoxide dismutase, glutathione peroxidase and glutathione were observed together with decrease in the level of malondialdehyde after treatment with rutin in a dose-dependent manner. Furthermore, the effect of rutin on the tumor necrosis factor-α and interleukin-1β in arthritic rats showed does-dependent lowering of these cytokines with maximum benefit at 15 mg/kg dose and the level of both NF-κB p65 and NF-κBp65 (Ser536) has been significantly reduced in the presence of rutin. Histopathological examination showed that the inflammatory cells infiltration, synovial hyperplasia, pannus formation and cartilage and bone erosion had considerably improved on administration of rutin. In conclusion, our paper strongly demonstrated the protective effect of rutin against the rheumatoid arthritis involved via suppression of NF-κB p65 protein expression.

Use of Anti-Tumor Necrosis Factor Therapy: A Retrospective Study of Monotherapy and Adherence to Combination Therapy with Non-Biologic Disease-Modifying Anti-Rheumatic Drugs

INTRODUCTION

This study examined the use of anti-tumor necrosis factor (anti-TNF) monotherapy, adherence with non-biologic disease-modifying anti-rheumatic drugs (nbDMARDs) in patients receiving a combination of anti-TNF therapies and nbDMARDs, and the impact of nbDMARD adherence on anti-TNF persistence among patients with rheumatoid arthritis (RA).

METHODS

Patients with RA (aged ≥18 years) from a US commercial health plan with claims for anti-TNFs (2006-2010) were defined as either biologic-naive or -exposed anti-TNF initiators based on previous nbDMARD use. Adherence to nbDMARDs and anti-TNF persistence were estimated. Cox regression estimated the association between nbDMARD adherence and anti-TNF persistence.

RESULTS

Among 9764 patients identified (mean age 50.2 years; 78% female), 55% of biologic-naive patients and 49% of previously exposed patients initiated any combination therapy during follow-up. Among biologic-naive combination therapy patients, 53% adhered to nbDMARD therapy <80% of the time while receiving anti-TNF therapies; 33% had <60% adherence. Compared with the most adherent patients, patients adherent to nbDMARDs 20% to 79% of the time were 30% to 20% more likely to discontinue their anti-TNF therapy in the period >90 days after starting the anti-TNF therapy. This relationship was not observed for patients with nbDMARD adherence of <20% (who were less likely to discontinue their anti-TNF therapy during the first 90 days of treatment).

CONCLUSION

Almost one-third of patients with RA receiving anti-TNF therapy received it as pure monotherapy. About one-third of combination therapy recipients had <60% adherence to nbDMARDs. Higher nbDMARD adherence may be associated with better anti-TNF persistence after an initial treatment period.

A store-operated calcium channel inhibitor attenuates collagen-induced arthritis

BACKGROUND AND PURPOSE

Store-operated calcium (SOC) channels are thought to play a critical role in immune responses, inflammatory diseases and chronic pain. The aim of this study was to explore the potential role and mechanisms of SOC channels in collagen-induced arthritis (CIA).

EXPERIMENTAL APPROACH

The CIA mouse model was used to examine the effects of the SOC channel inhibitor YM-58483 on CIA and arthritic pain. Hargreaves' and von Frey hair tests were conducted to measure thermal and mechanical sensitivities of hind paws. elisa was performed to measure cytokine production, and haematoxylin and eosin staining was used to assess knee histological changes. Western blot analysis was performed to examine protein levels.

KEY RESULTS

Pretreatment with 5 or 10 mg · kg(-1) of YM-58483 reduced the incidence of CIA, prevented the development of inflammation and pain hypersensitivity and other signs and features of arthritis disease. Similarly, treatment with YM-58483 after the onset of CIA: (i) reversed the clinical scores; (ii) reduced paw oedema; (iii) attenuated mechanical and thermal hypersensitivity; (iv) improved spontaneous motor activity; (v) decreased periphery production of IL-1β, IL-6 and TNF-α; and (vi) reduced spinal activation of ERK and calmodulin-dependent PKII (CaMKIIα).

CONCLUSIONS AND IMPLICATIONS

This study provides the first evidence that inhibition of SOC entry prevents and relieves rheumatoid arthritis (RA) and arthritic pain. These effects are probably mediated by a reduction in cytokine levels in the periphery and activation of ERK and CaMKIIα in the spinal cord. These results suggest that SOC channels are potential drug targets for the treatment of RA.

Interleukin-1 as a common denominator from autoinflammatory to autoimmune disorders: premises, perils, and perspectives

A complex web of dynamic relationships between innate and adaptive immunity is now evident for many autoinflammatory and autoimmune disorders, the first deriving from abnormal activation of innate immune system without any conventional danger triggers and the latter from self-/non-self-discrimination loss of tolerance, and systemic inflammation. Due to clinical and pathophysiologic similarities giving a crucial role to the multifunctional cytokine interleukin-1, the concept of autoinflammation has been expanded to include nonhereditary collagen-like diseases, idiopathic inflammatory diseases, and metabolic diseases. As more patients are reported to have clinical features of autoinflammation and autoimmunity, the boundary between these two pathologic ends is becoming blurred. An overview of monogenic autoinflammatory disorders, PFAPA syndrome, rheumatoid arthritis, type 2 diabetes mellitus, uveitis, pericarditis, Behçet's disease, gout, Sjögren's syndrome, interstitial lung diseases, and Still's disease is presented to highlight the fundamental points that interleukin-1 displays in the cryptic interplay between innate and adaptive immune systems.

An expanding role for interleukin-1 blockade from gout to cancer

There is an expanding role for interleukin (IL)-1 in diseases from gout to cancer. More than any other cytokine family, the IL-1 family is closely linked to innate inflammatory and immune responses. This linkage is because the cytoplasmic segment of all members of the IL-1 family of receptors contains a domain, which is highly homologous to the cytoplasmic domains of all toll-like receptors (TLRs). This domain, termed "toll IL-1 receptor (TIR) domain," signals as does the IL-1 receptors; therefore, inflammation due to the TLR and the IL-1 families is nearly the same. Fundamental responses such as the induction of cyclo-oxygenase type 2, increased surface expression of cellular adhesion molecules and increased gene expression of a broad number of inflammatory molecules characterizes IL-1 signal transduction as it does for TLR agonists. IL-1β is the most studied member of the IL-1 family because of its role in mediating autoinflammatory disease. However, a role for IL-1α in disease is being validated because of the availability of a neutralizing monoclonal antibody to human IL-1α. There are presently three approved therapies for blocking IL-1 activity. Anakinra is a recombinant form of the naturally occurring IL-1 receptor antagonist, which binds to the IL-1 receptor and prevents the binding of IL-1β as well as IL-1α. Rilonacept is a soluble decoy receptor that neutralizes primarily IL-1β but also IL-1α. Canakinumab is a human monoclonal antibody that neutralizes only IL-1β. Thus, a causal or significant contributing role can be established for IL-1β and IL-1α in human disease.

Novel multimeric IL-1 receptor antagonist for the treatment of rheumatoid arthritis

Protein therapeutics targeting inflammatory mediators have shown great promise for the treatment of autoimmunities such as rheumatoid arthritis (RA). However, a significant challenge in this area has been their low in vivo stability and consequently their severely compromised therapeutic efficacy. One such therapeutic molecule IL-1 receptor antagonist (IL-1ra), used in the treatment of rheumatoid arthritis, has displayed only modest efficacy in human clinical trials owing to its short biological half-life. Herein, we report a novel approach to conglomerate individual protein entities into a drug depot by incorporation of an amyloidogenic motif Lys-Phe-Phe-Glu (KFFE) thereby dramatically improving their systemic persistence and in turn their therapeutic efficacy in a mice model of autoimmune arthritis.

Recombinant human interleukin receptor antagonist influences serum chemokines in patients with rheumatoid arthritis

OBJECTIVE

To investigate the serum expressions of chemokines CCL2 and CCL3 in patients with rheumatoid arthritis (RA) who were treated with recombinant human interleukin 1 (IL-1) receptor antagonist (IL-1Ra).

MATERIAL AND METHODS

Serum CCL2 and CCL3 were determined using an enzyme-linked immunosorbent assay in 54 active RA patients before and after treatment with IL-1Ra or a placebo, as well as 36 healthy controls.

RESULTS

Compared with the healthy controls, all the 54 RA patients exhibited higher serum CCL2 and CCL3 before and after treatment (p < 0.05). However, patients who had a good response to IL-1Ra treatment had significantly lower mean changes in the serum CCL2 and CCL3 levels from baseline to the last injection than IL-1Ra non-responders (p < 0.01).

CONCLUSIONS

CCL2 and CCL3 may be useful efficacy markers of IL-1Ra treatment.

Current immunotherapy in rheumatoid arthritis

Rheumatoid arthritis is a common autoimmune disease primarily manifesting as chronic synovitis, subsequently leading to a change in joint integrity. Progressive disability and systemic complications are strongly associated with a decreased quality of life. To maintain function and health in patients with rheumatoid arthritis, early, aggressive and guided immunosuppressive therapy is required to induce clinical remission. Antirheumatic drugs are capable of controlling synovial inflammation and are therefore named 'disease-modifying antirheumatic drugs' (DMARDs). This article aims to bridge the beginning of DMARD therapy with agents such as methotrexate, leflunomide, sulfasalazine, injectable gold and (hydroxy)chloroquine with biological therapies, and with the new era of kinase inhibitors. Mechanisms of action, as well as advantages and disadvantages of DMARDs, are discussed with respect to the current literature and current recommendations.

Emerging therapies for rheumatoid arthritis

INTRODUCTION

With the introduction of biologic therapies, tremendous progress has been made in the treatment of rheumatoid arthritis (RA). However, up to 40% of patients do not respond to these treatments.

AREAS COVERED

Several new treatment strategies are discussed, with brief overview of currently performed clinical trials. The development of molecules targeting cytokines other than TNF is discussed, as well as chemokine-directed drugs. Finally, the area of small molecular inhibitors is explored.

EXPERT OPINION

Since RA is a life-long disease often evolving into disability, development of new treatment strategies remains crucial. Especially small molecules targeting JAK, Syk and PDE4 may provide novel therapeutic options.

The regulatory role of immunosuppressants on immune abnormalities in acute pancreatitis

The uncontrolled progression of the inflammatory cascade is the main cause underlying the development of multiple organ dysfunction syndrome (MODS) in acute pancreatitis. In this study, we investigated the effects of several immunosuppressants on mitigating the systemic inflammatory reaction syndrome (SIRS) and the compensatory anti-inflammatory response syndrome (CARS) associated with acute pancreatitis. A total of 93 male Sprague Dawley rats were divided into 5 groups: group 1 was the sham group and group 2 underwent laparoscopic intrapancreatic duct injection of sodium taurocholate to induce pancreatitis. The remaining 3 groups were the same as group 2, with the addition of methylprednisolone, cyclophosphamide or methotrexate treatment (metastab, CTX or MTX groups, respectively). Following establishment of the acute pancreatitis model, the serum levels of inflammatory and anti-inflammatory cytokines in groups 2, 3, 4 and 5 were found to be significantly elevated. Following immunosuppressant administration, the levels of all inflammatory and anti-inflammatory cytokines investigated in groups 3, 4 and 5 were decreased compared to those in group 2. The pancreatic amylase levels and pancreatic wet weight (PWW) were also decreased in groups 3, 4 and 5 compared to those in group 2. Therefore, immunosuppressants may reduce inflammation-related cytokine levels in acute pancreatitis and relieve disease progression.

Treating inflammation by blocking interleukin-1 in humans

IL-1 is a master cytokine of local and systemic inflammation. With the availability of specific IL-1 targeting therapies, a broadening list of diseases has revealed the pathologic role of IL-1-mediated inflammation. Although IL-1, either IL-1α or IL-1β, was administered to patients in order to improve bone marrow function or increase host immune responses to cancer, these patients experienced unacceptable toxicity with fever, anorexia, myalgias, arthralgias, fatigue, gastrointestinal upset and sleep disturbances; frank hypotension occurred. Thus it was not unexpected that specific pharmacological blockade of IL-1 activity in inflammatory diseases would be beneficial. Monotherapy blocking IL-1 activity in a broad spectrum of inflammatory syndromes results in a rapid and sustained reduction in disease severity. In common conditions such as heart failure and gout arthritis, IL-1 blockade can be effective therapy. Three IL-1blockers have been approved: the IL-1 receptor antagonist, anakinra, blocks the IL-1 receptor and therefore reduces the activity of IL-1α and IL-1β. A soluble decoy receptor, rilonacept, and a neutralizing monoclonal anti-interleukin-1β antibody, canakinumab, are also approved. A monoclonal antibody directed against the IL-1 receptor and a neutralizing anti-IL-1α are in clinical trials. By specifically blocking IL-1, we have learned a great deal about the role of this cytokine in inflammation but equally important, reducing IL-1 activity has lifted the burden of disease for many patients.

Interleukin expression after injury and the effects of interleukin-1 receptor antagonist

Ligament healing follows a series of complex coordinated events involving various cell types, cytokines, as well as other factors, producing a mechanically inferior tissue more scar-like than native tissue. Macrophages provide an ongoing source of cytokines to modulate inflammatory cell adhesion and migration as well as fibroblast proliferation. Studying interleukins inherent to ligament healing during peak macrophage activation and angiogenesis may elucidate inflammatory mediators involved in subsequent scar formation. Herein, we used a rat healing model assayed after surgical transection of their medial collateral ligaments (MCLs). On days 3 and 7 post-injury, ligaments were collected and used for microarray analysis. Of the 12 significantly modified interleukins, components of the interleukin-1 family were significantly up-regulated. We therefore examined the influence of interleukin-1 receptor antagonist (IL-1Ra) on MCL healing. Transected rat MCLs received PBS or IL-1Ra at the time of surgery. Inhibition of IL-1 activation decreased pro-inflammatory cytokines (IL-1α, IL-1β, IL-12, IL-2, and IFN-γ), myofibroblasts, and proliferating cells, as well as increased anti-inflammatory cytokines (IL-10), endothelial cells/blood vessel lumen, M2 macrophages, and granulation tissue size without compromising the mechanical properties. These results support the concept that IL-1Ra modulates MCL-localized granulation tissue components and cytokine production to create a transient environment that is less inflammatory. Overall, IL-1Ra may have therapeutic potential early in the healing cascade by stimulating the M2 macrophages and altering the granulation tissue components. However, the single dose of IL-1Ra used in this study was insufficient to maintain the more regenerative early response. Due to the transient influence on most of the healing components tested, IL-1Ra may have greater therapeutic potential with sustained delivery.

Evaluation of inconsistency in networks of interventions

BACKGROUND

The assumption of consistency, defined as agreement between direct and indirect sources of evidence, underlies the increasingly popular method of network meta-analysis. No evidence exists so far regarding the extent of inconsistency in full networks of interventions or the factors that control its statistical detection.

METHODS

In this paper we assess the prevalence of inconsistency from data of 40 published networks of interventions involving 303 loops of evidence. Inconsistency is evaluated in each loop by contrasting direct and indirect estimates and by employing an omnibus test of consistency for the entire network. We explore whether different effect measures for dichotomous outcomes are associated with differences in inconsistency, and evaluate whether different ways to estimate heterogeneity affect the magnitude and detection of inconsistency.

RESULTS

Inconsistency was detected in from 2% to 9% of the tested loops, depending on the effect measure and heterogeneity estimation method. Loops that included comparisons informed by a single study were more likely to show inconsistency. About one-eighth of the networks were found to be inconsistent. The proportions of inconsistent loops do not materially change when different effect measures are used. Important heterogeneity or the overestimation of heterogeneity was associated with a small decrease in the prevalence of statistical inconsistency.

CONCLUSIONS

The study suggests that changing the effect measure might improve statistical consistency, and that an analysis of sensitivity to the assumptions and an estimator of heterogeneity might be needed before reaching a conclusion about the absence of statistical inconsistency, particularly in networks with few studies.

Health-related quality of life as a main determinant of access to rheumatologic care

To evaluate a rheumatology outpatient consultation access system for new patients. New patients seen from April 2005 to April 2006 at our rheumatology clinic (n = 4,460) were included and classified according to their appointment type: ordinary appointments (OA) to be seen within 30 days, urgent appointments (UA) and work disability appointments (WDA) to be seen within 3 days. Age, sex, diagnosis, and health-related quality of life (HRQoL) as determined by the Rosser Index were recorded. Logistic regression models were run to identify factors that contribute to each type of appointment. OA was the method of access for 1,938 new patients, while 1,194 and 1,328 patients were seen through WDA and UA appointments, respectively. Younger male patients, and those with microcrystalline arthritis, sciatica, shoulder, back, or neck pain, were more likely to use the faster access systems (UA or WDA), whereas patients with a degenerative disease were mainly seen through OA (<0.001). Subjects with poor (3.96; 95 % CI, 2.8-5.5) or very poor HRQoL (70.8; 95 % CI, 14.9-334) were strongly associated to visiting a rheumatologist through the WDA or UA access systems, respectively, compared to OA. Age, gender, diagnosis, and mainly health-related quality of life are associated with the referral pattern of access to rheumatologic outpatient care. Among new patients subjects with the worst HRQoL were more likely to access with faster methods (UA or WDA) than those with better HRQoL.

Methods used to conduct and report Bayesian mixed treatment comparisons published in the medical literature: a systematic review

OBJECTIVES

To identify published closed-loop Bayesian mixed treatment comparisons (MTCs) and to summarise characteristics regarding their conduct and reporting.

DESIGN

Systematic review.

METHODS

We searched multiple bibliographic databases (January 2006-31 July 2011) for full-text, English language publications of Bayesian MTCs comparing the effectiveness or safety of ≥3 interventions based on randomised controlled trials and having at least one closed loop. Methodological and reporting characteristics of MTCs were extracted in duplicate and summarised descriptively.

RESULTS

We identified 34 Bayesian MTCs spanning 13 clinical areas. Publication of MTCs increased over the 5-year period; with 76.5% published during or after 2009. MTCs included a mean (±SD) of 35.9±30.1 trials (n=33 459±71 233 participants) and 8.5±4.3 interventions (85.7% pharmacological). Non-informative and informative prior distributions were reported to be used in 44.1% and 8.8% of MTCs, respectively, with the remainder failing to specify the prior used. A random-effects model was used to analyse the networks of trials in 58.5% of MTCs, all using WinBUGS; however, code was infrequently provided (20.6%). More than two-thirds of MTCs (76.5%) also conducted traditional meta-analysis. Methods used to evaluate convergence, heterogeneity and inconsistency were infrequently reported, but from those providing detail, methods appeared varied. MTCs most often used a binary effect measure (85.3%) and ranking of interventions based on probability was common (61.8%), although rarely displayed in a figure (8.8% of MTCs). MTCs were published in 24 different journals with a mean impact factor of 9.20±8.71. While 70.8% of journals imposed limits on word counts and 45.8% limits on the number of tables/figures, online supplements/appendices were allowed in 79.2% of journals. Publication of closed-loop Bayesian MTCs is increasing in frequency, but details regarding their methodology are often poorly described. Efforts in clarifying the appropriate methods and reporting of Bayesian MTCs should be of priority.

Mixed treatment comparison of the treatment discontinuations of biologic disease-modifying antirheumatic drugs in adults with rheumatoid arthritis

BACKGROUND

Introduction of biologic disease-modifying antirheumatic drugs (DMARDs) has considerably changed treatment options for rheumatoid arthritis (RA) over the past decade. Very little information is available on comparative discontinuation rates of the biologics.

OBJECTIVE

To compare treatment discontinuations for 9 biologic DMARDs in adults with RA.

METHODS

We searched electronic databases through May 2012 to retrieve randomized controlled trials (RCTs) of patients with RA that compared biologic DMARDs with placebo or another biologic DMARD. The primary outcome was treatment discontinuation during the blinded phase of the trials, measured as overall withdrawals, withdrawals resulting from lack of efficacy, and withdrawals resulting from adverse events. Random-effects meta-analysis estimated the effect size for individual agents, and adjusted indirect comparisons were made between biologics using mixed treatment comparisons (MTC) meta-analysis.

RESULTS

Forty-four trials were included in the analysis. In comparison with placebo, biologics were less likely to be withdrawn because of lack of efficacy (OR 0.22, 95% CI 0.17 to 0.27) and more likely to be withdrawn because of an adverse event (OR 1.41, 95% CI 1.16 to 1.70). Based on the MTC, certolizumab had the most favorable overall withdrawal profile, followed by etanercept and rituximab. Certolizumab had lower relative withdrawal rates resulting from lack of efficacy than adalimumab, anakinra, and infliximab. Anakinra had higher relative withdrawal rates resulting from lack of efficacy than most other biologics. Certolizumab and infliximab had more, while etanercept had fewer, withdrawals because of adverse events than most other drugs.

CONCLUSIONS

Based on MTC using data from RCTs, differences in discontinuation rates were observed, generally favoring certolizumab, etanercept, and rituximab over other biologic DMARDs. These potential differences need to be further explored in head-to-head trials or well-conducted observational studies.

Why the findings of published multiple treatment comparison meta-analyses of biologic treatments for rheumatoid arthritis are different: an overview of recurrent methodological shortcomings

OBJECTIVES

To evaluate the quality of published multiple treatment comparison (MTC) meta-analyses on biologic disease modifying antirheumatic drugs (bDMARDs) for rheumatoid arthritis (RA), and to identify methodological issues that can explain the discrepancies in the findings of these MTCs.

METHODS

We searched MEDLINE for MTCs of bDMARDs for RA. Following the PRISMA guidelines, we extracted a large set of methodological items. These comprised of inclusion/exclusion criteria, information sources, reported results and outcomes measures, approaches to dealing with differing response profiles to available treatments, monotherapies versus combination therapies, and potential sources of heterogeneity.

RESULTS

We identified 13 published MTCs, of which nine were published since 2009. Despite similar stated eligibility criteria and objectives across MTCs, we identified major discrepancies in the estimated treatment effects, the inclusion of trials and analytic approaches. The number of included trials was typically much smaller than the number of eligible trials at the time of publication. Three out of six MTCs including patients of differing response profiles inappropriately combined DMARD-naive and DMARD-inadequate responder patients in the analyses. Four out of eight MTCs that considered both monotherapy and combination therapy (ie, concomitant DMARD) did not adjust for the potential effect modification. Half of the identified MTCs did not explore potential sources of heterogeneity, and the explored sources varied considerably. Last, most MTCs only included one or two efficacy outcomes (eg, ACR50) and only two considered health related quality of life outcomes (eg, HAQ).

CONCLUSIONS

The identified methodological shortcomings and inconsistencies most likely explain the observed discrepancies in findings across MTCs.

Effects of interleukin-1 receptor antagonist on collagen and matrix metalloproteinases in stress-shielded achilles tendons of rats

Based on previous studies showing that interleukin-1 (IL-1) significantly increased after stress shielding, this article reports further research into the possible therapeutic applications of IL-1 receptor antagonist (IL-1Ra). Forty rats whose left Achilles tendons were denervated and completely stress shielded were divided into 5 groups: 2-week phosphate-buffered saline (PBS); 4-week PBS; 2-week IL-1Ra; 4-week IL-1Ra; and normal control. The Achilles tendons were tested morphologically, and the changes in collagen I and III, matrix metalloproteinases (MMP)-1 and -3, and tissue inhibitors of metalloproteinase (TIMP)-1 were determined. The collagen fibrils in the IL-1Ra groups were morphologically more similar to those in the control group than to those in the PBS groups. The collagen I levels increased in the 2-week groups. Significant differences existed between the PBS and IL-1Ra groups at 4 weeks. The MMP-1 level increased dramatically after stress shielding and increased less in the 2-week IL-1Ra group than in the 2-week PBS group. The degree of decrease of MMP-3 in the IL-1Ra groups was significantly less than that in the PBS groups. The collagen III and TIMP-1 levels continued to increase, and no difference was found between the PBS and IL-1Ra groups. Interleukin-1 receptor antagonist prevented morphological deterioration and collagen metabolism of the denervated Achilles tendons after stress shielding, likely by inhibiting the decline of MMP-3 and increasing MMP-1 levels at an early stage.

The role of adalimumab in rheumatic and autoimmune disorders: comparison with other biologic agents

Adalimumab (ADA) is a biologic medication that dampens inflammatory pathways by binding to the cytokine tumor necrosis factor alpha. The US Food and Drug Administration has approved ADA as a medication for use in rheumatoid arthritis, psoriatic arthritis, ankylosing spondylitis, Crohn’s disease, psoriasis, and juvenile idiopathic arthritis. This year marks 10 years of clinical experience with ADA. Long-term extension studies of some of the initial clinical trials, as well as data from large patient registries, are demonstrating ongoing benefit for responders. Potential side effects such as increased risk of infection, lymphoma, congestive heart failure, and demyelination continue to be examined, as the available data are not unanimous in showing an increase in incidence. In balancing both the advantages and the disadvantages of using ADA, the drug’s overall effectiveness and its availability for use in patients with hepatic or renal comorbidities are weighed against the high cost. ADA is expected to have a leading role in the treatment of rheumatoid arthritis and other inflammatory conditions for years to come. Future studies will need to address the optimal sequence of disease-modifying antirheumatic drugs and biologics to use, combinations of disease-modifying antirheumatic drugs and biologics, and head-to-head comparisons of biologics in clinical trials. For those who go into clinical remission on an anti-tumor necrosis factor medication, unanswered questions remain about identifying the patients who can maintain the remission off all drugs, or at least off injected medication. Given the cost of biologic drugs, even studies that increase the interval between drug doses in well-controlled patients could provide financial benefits.

Targeted therapy for patients with chronic myeloid leukemia: clinical trial experience and challenges in inter-trial comparisons

The treatment of chronic myeloid leukemia (CML) was revolutionized by the introduction of the targeted tyrosine kinase inhibitor (TKI) imatinib mesylate. Later, to improve efficacy and tolerability, the more potent TKIs dasatinib and nilotinib were evaluated in CML. Clinicians comparing the clinical efficacy of TKIs face considerable challenges, including the variable treatment histories of patients receiving second-line therapy. The aim of this review is to highlight the pitfalls and possible solutions for comparing efficacy across disparate CML trials. Comparison of efficacy across trials is aided by careful consideration of possible confounding factors, including treatment history, definitions of imatinib intolerance or resistance, and BCR-ABL mutational status at baseline. However, methods exist to improve the comparability of data from different trials, yielding a more clinically and statistically meaningful inter-trial comparison.

An overview of models used in economic analyses of biologic therapies for arthritis--from current diversity to future consensus

A number of cost-effectiveness models have been developed with the aim of providing guidance for decision making on biologic therapies for the management of inflammatory joint disease. The findings of these analyses can differ markedly, and these differences can undermine the credibility of such models if unexplained. To allow differences between models to be identified more easily, we define six components common to all models-initial response, longer term disease progression, mortality, quality-adjusted life year estimation, resource use and the selection and interpretation of data. We give examples of divergent approaches taken by model structures to the same issue, and explore the impact of divergence on model results, with particular focus on two models that have reported substantially different estimates for the cost-effectiveness of third-line etanercept vs conventional DMARD. The sensitivity of results to a particular assumption made in a model will depend on the decision problem and assumptions made elsewhere in the model, highlighting the importance of guidance throughout model development. To some extent, guidance from bodies such as the National Institute of Health and Clinical Excellence can be used to determine which approach should be preferred where models differ. However, there is a pressing need for clinical input and guidance before consensus can be reached on the most credible model(s) to use for decision support.

Resolvins and inflammatory pain

Resolvins are a group of molecules derived from omega-3 fatty acids. They are part of a biochemical program that allows inflamed tissues to return to homeostasis once the need for the inflammatory response is over. Resolvins act in very low dose ranges in vitro and in vivo. New data suggest that they might have the potential to become very potent analgesic drugs in inflammatory pain.

A mixed treatment comparison of the short-term efficacy of biologic disease modifying anti-rheumatic drugs in established rheumatoid arthritis

BACKGROUND

The short-term efficacy of biological disease modifying anti-rheumatic drugs (bDMARDs) for the treatment of established moderate to severe rheumatoid arthritis (RA) has been demonstrated by various randomized placebo or active treatment controlled trials. However, there is a lack of direct comparison of these agents.

SCOPE

To compare the short-term efficacy of nine bDMARDs - abatacept, adalimumab, anakinra, certolizumab, etanercept, golimumab, infliximab, rituximab and tocilizumab - in patients with established RA.

FINDINGS

A systematic review was conducted to obtain all available efficacy data for each included bDMARD. Medline, EMBASE, and Cochrane clinical trials were searched for trials in patients with RA. Twenty-seven trials were retrieved from a systematic literature search and included in the meta-analysis. Mixed treatment comparison (MTC) techniques were used to perform indirect comparisons. Analyses were conducted to estimate the odds ratio of an ACR20, ACR50, and ACR70 response at approximately six months if treated with a bDMARD compared with placebo or methotrexate. Between-drug comparisons were also made. The analyses were performed including recommended doses only (as per the product information). All drugs except anakinra and golimumab demonstrated a statistically significant advantage compared to control treatment for ACR20 responses. The between-drug comparisons revealed a statistically significant advantage for certolizumab compared to most bDMARDs for ACR20, ACR50 and ACR70 response and for etanercept versus adalimumab and anakinra for ACR20 and ACR50 response, as well as a statistically significant advantage for tocilizumab versus anakinra for ACR50 response.

CONCLUSION

The analyses, using MTC of efficacy of nine bDMARDs suggest that treatment with anakinra is inferior to other bDMARDs and that etanercept and certolizumab may be more effective than other bDMARDs. There are some limitations of our analyses due to MTC assumptions, variations in trial design and the fact that only ACR outcomes at six months were included.

The relative efficacy of nine osteoporosis medications for reducing the rate of fractures in post-menopausal women

BACKGROUND

In the absence of head-to-head trials, indirect comparisons of randomized placebo-controlled trials may provide a viable option to assess relative efficacy. The purpose was to estimate the relative efficacy of reduction of fractures in post-menopausal women, and to assess robustness of the results.

METHODS

A systematic literature review of multiple databases identified randomized placebo-controlled trials with nine drugs for post-menopausal women. Odds ratio and 95% credibility intervals for the rates of hip, non-vertebral, vertebral, and wrist fractures for each drug and between drugs were derived using a Bayesian approach. A drug was ranked as the most efficacious if it had the highest posterior odds ratio, or had the highest effect size.

RESULTS

30 studies including 59,209 patients reported fracture rates for nine drugs: alendronate (6 studies), denosumab (1 study), etidronate (8 studies), ibandronate (4 studies), raloxifene (1 study), risedronate (7 studies), strontium (2 study), teriparatide (1 study), and zoledronic acid (1 study). The drugs with the highest probability of reducing non-vertebral fractures was etidronate and teriparatide while the drugs with the highest probability of reducing vertebral, hip or wrist fractures were teriparatide, zoledronic acid and denosumab. The drugs with the largest effect size for vertebral fractures were zoledronic acid, teriparatide and denosumab, while the drugs with the highest effect size for non-vertebral, hip or wrist fractures were alendronate or risedronate. Estimates were consistent between Bayesian and classical approaches.

CONCLUSION

Teriparatide, zoledronic acid and denosumab have the highest probabilities of being most efficacious for non-vertebral and vertebral fractures, and having the greatest effect sizes. The estimates from indirect comparisons were robust to differences in methodology.

A case study of model-based Bayesian dose response estimation

A Bayesian nonlinear longitudinal Emax model for a binary endpoint was used to characterize the dose-response relationship for a new treatment of rheumatoid arthritis. The model includes prespecified parametric functions for the dependence of response on dose level and time. It was selected based on pharmacometric input about likely dose and time trends. The longitudinal model was useful for combining data collected at different doses and times from two different studies. The example illustrates the utility of more substantive parametric models to guide selection of doses outside the initial dosing range when designing an additional phase 2 study and for extrapolating shorter-term phase 2 dose response to longer-term phase 3 studies, as is often required for dosing decisions in drug development for chronic diseases. Comparison of the estimated dose response from the longitudinal model with a corresponding logistic regression model applied at a single time point also demonstrated improved precision. Specification of an informative prior distribution based on numerous sources of prior information is described. This was the most difficult step in the analysis and one that has limited the use of Bayesian methods in similar applications. Model fit was evaluated and the potential impact of some model deficiencies on the dosing decision was assessed. Analyses of the combined studies identified doses likely to achieve a targeted effect in larger and longer confirmatory trials.

Impact of concomitant use of DMARDs on the persistence with anti-TNF therapies in patients with rheumatoid arthritis: results from the British Society for Rheumatology Biologics Register

Objective

To evaluate the effect of different concomitant disease modifying antirheumatic drugs (DMARDs) on the persistence with antitumour necrosis factor (anti-TNF) therapies in patients with rheumatoid arthritis (RA).

Method

This analysis included 10 396 patients with RA registered with the British Society for Rheumatology Biologics Register, a prospective observational cohort study, who were starting their first anti-TNF therapy and were receiving one of the following DMARD treatments at baseline: no DMARD (n=3339), methotrexate (MTX) (n=4418), leflunomide (LEF) (n=610), sulfasalazine (SSZ) (n=308), MTX+SSZ (n=902), MTX+ hydroxychloroquine (HCQ) (n=401) or MTX+SSZ+HCQ (n=418). Kaplan–Meier survival analysis was used to study the persistence with anti-TNF therapy in each DMARD subgroup up to 5 years. Multivariate Cox proportional hazard models, stratified by anti-TNF used and start year and adjusted for a number of potential confounders, were used to compare treatment persistence overall and according to the reason for discontinuation between each of the DMARD subgroups, using MTX as reference.

Results

One-year drug survival (95% CI) for the first anti-TNF therapy was 71% (71% to 72%) but this dropped to 42% (41% to 43%) at 5 years. Compared with MTX, patients receiving no DMARD, LEF or SSZ were more likely to discontinue their first anti-TNF therapy while patients receiving MTX in combination with other DMARDs showed better treatment persistence.

Conclusions

These results support the continued use of background DMARD combinations which include MTX. Consideration should be given to the discontinuation of LEF and SSZ monotherapy at the time anti-TNF therapies are started, with the possible exception of the SSZ+ETN combination.

Evaluating the efficacy of sequential biologic therapies for rheumatoid arthritis patients with an inadequate response to tumor necrosis factor-α inhibitors

Introduction

The long-term treatment of rheumatoid arthritis (RA) most often involves a sequence of different therapies. The response to therapy, disease progression and detailed knowledge of the role of different therapies along treatment pathways are key aspects to help physicians identify the best treatment strategy. Thus, understanding the effectiveness of different therapeutic sequences is of particular importance in the evaluation of long-term RA treatment strategies. The objective of this study was to systematically review and quantitatively evaluate the relationship between the clinical response to biologic treatments and the number of previous treatments with tumor necrosis factor α (TNF-α) inhibitors.

Methods

A systematic search was undertaken to identify published, peer-reviewed articles that reported clinical outcomes of biologic treatment among RA patients with an inadequate response to TNF-α inhibitors. Data were systematically abstracted. Efficacy rates were estimated for groups of patients who differed in the number of prior TNF-α inhibitors used. End points included American College of Rheumatology (ACR)-, European League Against Rheumatism (EULAR)- and Disease Activity Score 28 (DAS28)-based response criteria.

Results

The literature search identified 41 publications, of which 28 reported biologic treatment outcomes for RA patients with prior exposure to TNF-α inhibitors. Seven publications reported outcomes obtained in randomized clinical trials, while the remaining consisted of observational studies. The likelihood of responding to a subsequent biologic treatment decreased as the number of previous treatments with TNF-α inhibitors increased for six of the seven response criteria examined.

Conclusions

For patients with prior exposure to TNF-α inhibitors, the likelihood of response to subsequent treatment with biologic agents declines with the increasing number of previous treatments with TNF-α inhibitors.

Gene expression profiling in peripheral blood cells of patients with rheumatoid arthritis in response to anti-TNF-alpha treatments

The efficacy of anti-TNF-α therapies highlights the role of TNF-α in the pathogenesis of rheumatoid arthritis (RA). However, the mechanism of action of these agents is poorly understood at the molecular level. The aim of this study was to characterize the effects of anti-TNF-α treatment on the global gene expression profile in peripheral blood mononuclear cells (PBMCs) of responder RA patients. Changes in gene expression were determined using oligonucleotide microarrays (25,341 genes) in PBMCs obtained before and after 12 wk of treatment with either etanercept or adalimumab from responder RA patients. Two hundred fifty-one genes displayed significant changes (false discovery rate < 0.1%) in expression level (178 upregulations with mean fold change = 1.5 and 73 downregulations with mean fold change = -1.50) after 12 wk of treatment. Importantly, the expression of several genes, including those coding for the calcium binding proteins S100A12 and A8, CD14 antigen, Selectin P, or ribosomal protein L39, reported to be upregulated in RA patients, were found to be decreased after anti-TNF-α treatment. Globally, inflammation, immune response, apoptosis, protein synthesis, and mitochondrial oxido-reduction were the most affected pathways in response to anti-TNF-α treatment. The obtained gene expression signature in PBMCs provides new information to better understand the mechanisms of action of anti-TNF-α treatment in RA patients.

Comparison of certolizumab pegol with other anticytokine agents for treatment of rheumatoid arthritis: a multiple-treatment Bayesian metaanalysis

OBJECTIVE

To compare the clinical efficacy of certolizumab pegol (CZP) with that of other anticytokine agents indicated for the treatment of rheumatoid arthritis (RA) with identical therapeutic indication (anti-tumor necrosis factor-α, anti-interleukin 1 or 6), with the objective of determining the noninferiority of CZP.

METHODS

A systematic review was performed to identify randomized controlled trials that assessed the efficacy of anticytokine agents in combination with conventional disease-modifying antirheumatic drugs (DMARD) after 6 months of treatment, using the American College of Rheumatology (ACR) response criteria, in patients with RA who have shown inadequate response to DMARD including methotrexate. Indirect treatment comparisons were carried out by a multiple-treatment Bayesian random-effects metaanalysis. Data were analyzed using the Markov chain Monte Carlo simulation. Noninferiority of CZP was assessed in comparison with a predefined equivalence margin of 5%.

RESULTS

Nineteen placebo-controlled studies were identified: 14 evaluated the efficacy of 5 anti-TNF-α agents (infliximab, etanercept, adalimumab, golimumab, CZP) and 5 evaluated efficacy of 2 anti-interleukin agents (anakinra, tocilizumab). Every treatment showed significant efficacy versus placebo in individual studies. The multiple-treatment metaanalysis showed a highest OR for CZP on ACR20 response. Metaanalysis indicates that the efficacy of CZP according to ACR20 response is superior to that of infliximab, adalimumab, and anakinra, and equivalent or superior to that of etanercept, golimumab, and tocilizumab. According to ACR50 response, the efficacy of CZP is equivalent or superior to that of all other anticytokines.

CONCLUSION

Results of this original multiple-treatment Bayesian metaanalysis indicate that certolizumab pegol is at least as efficacious as the preexisting antirheumatic anticytokine biotherapies.

[IL-1 antagonists]

Interleukin (IL)-1 plays an important role not only in the mediation of inflammation but also in the destruction of cartilage and bone. Together with TNF-alpha it is one of the most important cytokines in the pathogenesis of rheumatoid arthritis (RA) and juvenile idiopathic arthritis (JIA). The first IL-1 antagonist to be approved for RA was Anakinra, an IL-1 receptor antagonist. Anakinra appears to be less effective for RA than TNF blockers. Hence, Anakinra is rarely used for the treatment of RA, but more for the treatment of IL-1-mediated diseases such as autoinflammatory syndromes, adult-onset Still's disease and systemic onset JIA. Two newer IL-1 antagonists have recently been approved for the treatment of CAPS (cryopyrin-associated periodic syndromes): Canakinumab, a fully human IL-1beta antibody, and rilonacept, a fusion protein consisting of the ligand-binding domain of the IL-1 receptor and the IL-1-receptor accessory protein, bound to human IgG1. For RA, there is only one proof-of-concept study to date with canakinumab. There are no prospective data for the treatment of patients with RA who did not respond to or tolerate TNF antagonists; in a retrospective analysis, only 8% of anti-TNF pretreated patients achieved an ACR 20 response.