Glucocorticoid Dosages and Acute-Phase Reactant Levels at Giant Cell Arteritis Flare in a Randomized Trial of Tocilizumab

[Laboratory diagnostics for vasculitis beyond antineutrophil cytoplasmatic autoantibodies]

The diagnosis of systemic vasculitis (SV) is a major clinical challenge due to the very different forms of presentation and requires an interdisciplinary approach. Targeted laboratory diagnostics support making the diagnosis, differential diagnosis and classification and are also a key component in the detection of active organ manifestations and treatment complications. The basic laboratory tests include the erythrocyte sedimentation rate (ESR), C‑reactive protein (CRP), blood count, serum creatinine, urinalysis, specific autoantibodies, complement, immunoglobulins, cryoglobulins and hepatitis B and C serology. Antineutrophil cytoplasmic autoantibodies (ANCA), antiglomerular basement membrane antibodies (anti-GBM antibodies) and anti-C1q antibodies are valuable laboratory markers for the diagnosis of the various forms of small vessel vasculitis. There are no specific laboratory tests for the diagnosis of medium and large vessel vasculitis. Despite advances in our understanding of the pathogenesis of vasculitis, no biomarkers have yet been identified that can be reliably used to guide treatment or that are useful in distinguishing vasculitis from other inflammatory diseases such as infections or treatment complications.

Establishing clinical remission criteria for giant cell arteritis: Results of a Delphi exercise carried out by an expert panel of the Japan Research Committee of the Ministry of Health, Labour, and Welfare for Intractable Vasculitis

OBJECTIVE

To develop a proposal for giant cell arteritis remission criteria in order to implement a treat-to-target algorithm.

METHODS

A task force consisting of 10 rheumatologists, 3 cardiologists, 1 nephrologist, and 1 cardiac surgeon was established in the Large-vessel Vasculitis Group of the Japanese Research Committee of the Ministry of Health, Labour and Welfare for Intractable Vasculitis to conduct a Delphi survey of remission criteria for giant cell arteritis. The survey was circulated among the members over four reiterations with four face-to-face meetings. Items with a mean score of ≥4 were extracted as items for defining remission criteria.

RESULTS

An initial literature review yielded a total of 117 candidate items for disease activity domains and treatment/comorbidity domains of remission criteria, of which 35 were extracted as disease activity domains (systematic symptoms, signs and symptoms of cranial and large-vessel area, inflammatory markers, and imaging findings). For the treatment/comorbidity domain, ≤5 mg/day of prednisolone 1 year after starting glucocorticoids was extracted. The definition of achievement of remission was the disappearance of active disease in the disease activity domain, normalization of inflammatory markers, and ≤5 mg/day of prednisolone.

CONCLUSION

We developed proposals for remission criteria to guide the implementation of a treat-to-target algorithm for giant cell arteritis.

Concordance and agreement between different activity scores in polymyalgia rheumatica

OBJECTIVE

The C reactive protein polymyalgia rheumatica activity score (CRP-PMR-AS) is a composite index that includes CRP levels and was developed specifically for PMR. As treatments such as interleukin-6 antagonists can normalise CRP levels, the erythrocyte sedimentation rate (ESR) of PMR-AS, the clinical (clin)-PMR-AS and the imputed-CRP (imp-CRP)-PMR-AS have been developed to avoid such bias. Our primary objective was to measure the correlation of these activity scores. Our secondary objective was to evaluate the concordance between different cutoffs of the PMR-ASs.

METHOD

Data from the Safety and Efficacy of tocilizumab versus Placebo in Polymyalgia rHeumatica With glucocORticoid dEpendence (SEMAPHORE) trial, a superiority randomised double-blind placebo-controlled trial, were subjected to post hoc analysis to compare the efficacy of tocilizumab versus placebo in patients with active PMR. The CRP-PMR-AS, ESR-PMR-AS, clin-PMR-AS and imp-CRP-PMR-AS were measured at every visit. The concordance and correlation between these scores were evaluated using kappa correlation coefficients, Bland-Altman correlations, intraclass correlation coefficients (ICCs) and scatter plots.

RESULTS

A total of 101 patients were included in the SEMAPHORE trial, and 100 were analysed in this study. The correlation between the PMR-ASs was excellent, as the ICC and kappa were >0.85 from week 4 until week 24 (CRP-PMR-AS ≤10 or >10). Bland-Altman plots revealed that the differences between the CRP-PMR-AS and the other threescores were low. The cut-off values for the clin-PMR-AS were similar to those for the CRP-PMR-AS 86% of the time.

CONCLUSION

The correlation between all the PMR-ASs was excellent, reflecting the low weight of CRP. In clinical trials using drugs that have an impact on CRP, the derived activity scores can be used.

TRIAL REGISTRATION NUMBER

NTC02908217.

Evidence on treat to target strategies in polymyalgia rheumatica and giant cell arteritis: a systematic literature review

OBJECTIVES

To inform an international task force about current evidence on Treat to Target (T2T) strategies in PMR and GCA.

METHODS

A systematic literature research (SLR) was conducted in Medline, EMBASE, Cochrane Library, clinicaltrials.gov from their inception date to May 2022, and in the EULAR/ACR abstract database (2019-2021). Randomised clinical trials (RCTs) and non-randomised interventional studies published in English and answering at least one of the eleven PICO questions on T2T strategies, treatment targets and outcomes, framed by the taskforce, were identified. Study selection process, data extraction and risk of bias assessment were conducted independently by two investigators.

RESULTS

Of 7809 screened abstracts, 397 were selected for detailed review and 76 manuscripts were finally included (31 RCTs, eight subgroup/exploratory analyses of RCTs and 37 non-randomised interventional studies). No study comparing a T2T strategy against standard of care was identified. In PMR RCTs, the most frequently applied outcomes concerned treatment (90.9% of RCTs), particularly the cumulative glucocorticoids (GC) dose and GC tapering, followed by clinical, laboratory and safety outcomes (63.3% each). Conversely, the most commonly reported outcomes in RCTs in GCA were prevention of relapses (72.2%), remission as well as treatment-related and safety outcomes (67.0% each).

CONCLUSIONS

This SLR provides evidence and highlights the knowledge gaps on T2T strategies in PMR and GCA, informing the task force developing T2T recommendations for these diseases.

Treat-to-target recommendations in giant cell arteritis and polymyalgia rheumatica

OBJECTIVES

To develop treat-to-target (T2T) recommendations in giant cell arteritis (GCA) and polymyalgia rheumatica (PMR).

METHODS

A systematic literature review was conducted to retrieve data on treatment targets and outcomes in GCA/PMR as well as to identify the evidence for the effectiveness of a T2T-based management approach in these diseases. Based on evidence and expert opinion, the task force (29 participants from 10 countries consisting of physicians, a healthcare professional and a patient) developed recommendations, with consensus obtained through voting. The final level of agreement was provided anonymously.

RESULTS

Five overarching principles and six-specific recommendations were formulated. Management of GCA and PMR should be based on shared decisions between patient and physician recognising the need for urgent treatment of GCA to avoid ischaemic complications, and it should aim at maximising health-related quality of life in both diseases. The treatment targets are achievement and maintenance of remission, as well as prevention of tissue ischaemia and vascular damage. Comorbidities need to be considered when assessing disease activity and selecting treatment.

CONCLUSION

These are the first T2T recommendations for GCA and PMR. Treatment targets, as well as strategies to assess, achieve and maintain these targets have been defined. The research agenda highlights the gaps in evidence and the need for future research.

Single-cell transcriptomic profiling reveals a pathogenic role of cytotoxic CD4+ T cells in giant cell arteritis

Giant cell arteritis (GCA) is a systemic vasculitis mediated by an aberrant immunological response against the blood vessel wall. Although the pathogenic mechanisms that drive GCA have not yet been elucidated, there is strong evidence that CD4+ T cells are key drivers of the inflammatory process occurring in this vasculitis. The aim of this study was to further delineate the role of CD4+ T cells in GCA by applying single-cell RNA sequencing and T cell receptor (TCR) repertoire profiling to 114.799 circulating CD4+ T cells from eight GCA patients in two different clinical states, active and in remission, and eight healthy controls. Our results revealed an expansion of cytotoxic CD4+ T lymphocytes (CTLs) in active GCA patients, which expressed higher levels of cytotoxic and chemotactic genes when compared to patients in remission and controls. Accordingly, differentially expressed genes in CTLs of active patients were enriched in pathways related to granzyme-mediated apoptosis, inflammation, and the recruitment of different immune cells, suggesting a role of this cell type in the inflammatory and vascular remodelling processes occurring in GCA. CTLs also exhibited a higher clonal expansion in active patients with respect to those in remission. Drug repurposing analysis prioritized maraviroc, which targeted CTLs, as potentially repositionable for this vasculitis. In addition, effector regulatory T cells (Tregs) were decreased in GCA and showed lower expression of genes involved in their suppressive activity. These findings provide further insights into the pathogenic role of CD4+ T cells in GCA and suggest targeting CTLs as a potential therapeutic option.

Mycophenolate mofetil in giant cell arteritis

Introduction

Giant cell arteritis (GCA) is a systemic granulomatous vasculitis affecting the large arteries. Abnormal lymphocyte function has been noted as a pathogenic factor in GCA. Mycophenolate mofetil (MMF) inhibits inosine monophosphate dehydrogenase and is therefore a highly lymphocyte-specific immunosuppressive therapy. We aimed to assess the efficacy of MMF for inducing remission in GCA.

Methods

Seven patients (5 female, 2 male) with GCA under therapy with MMF and who were treated at the outpatient clinic for rare inflammatory systemic diseases at Hannover Medical School between 2010 and 2023 were retrospectively included in the study. All patients underwent duplex sonography, 18F-fluorodeoxyglucose positron emission tomography (18F-FDG PET), magnetic resonance imaging (MRI), and/or biopsy to confirm the diagnosis. The primary endpoints were the number of recurrences, CRP levels at 3-6 and 6-12 months, and the period of remission.

Results

All patients in this case series showed inflammatory activity of the arterial vessels in at least one of the imaging modalities: duplex sonography (n = 5), 18F-FDG PET (n = 5), MRI (n = 6), and/or biopsy (n = 5). CRP levels of all patients decreased at the measurement time points 3-6 months, and 6-9 months after initiation of therapy with MMF compared with CRP levels before MMF therapy. All patients with GCA in this case series achieved disease remission.

Discussion

The results of the present case series indicate that MMF is an effective therapy in controlling disease activity in GCA, which should be investigated in future randomized controlled trials.

Development of outcome measures for giant cell arteritis for use in clinical trials and standard practice

BACKGROUND

Developments in outcome measures in the rheumatic diseases are promoted by the development of successful treatments. Giant cell arteritis (GCA) is a multifaceted disorder and, therefore, measurement of multiple outcomes is relevant to this illness. It is a privilege to analyze and monitor/transfer long-term patients' management outcomes particularly if the same outcomes are used in practice and in trials.

OBJECTIVE

To classify the outcome measures for GCA with a discriminative ability to identify the disease activity status and response to therapy.

METHODS

This study was composed of two steps, instrument design (item generation) and judgmental evidence. A panel of 13 experts was used to validate the instrument through quantitative (content validity) and qualitative (cognitive interviewing) methods. Content validity index was used to assess content validity quantitatively.

RESULTS

Five items achieved high content validity where item-content validity index score was >0.79, and in the meantime achieved high content validity response score reflecting greater agreement among panel members. Through qualitative methods, items were improved until saturation was achieved. This agreed with the expert panel ranking of the items included in GCA disease outcome measures set.

CONCLUSION

For daily clinical practice, outcome measures should reflect the patients' disease activity status and have to be easily assessed and recorded. The study identified composite outcome measures for GCA able to assess the disease state and monitor response to therapy. Key Points • Despite the cohort studies published in giant cell arteritis (GCA), there are no fully validated outcome measures for use in standard practice or clinical trials. • There is a gap in international standards for assessing GCA disease activity. • Identifying disease specific outcome measures is vital for monitoring response to therapy, treatment case series and therapeutic clinical trials in GCA. • This study was carried out aiming to classify the outcome measures for GCA with a discriminative ability to identify the disease activity status and response to therapy.

Polymyalgia rheumatica

Polymyalgia rheumatica is an inflammatory disease producing pain and stiffness, mainly in the shoulders and pelvic girdle, in people older than 50 years. Elevation of acute phase reactants is common due to the inflammatory nature of the disease. Since there are no specific diagnostic tests, diagnosis requires the exclusion of other diseases with similar presentations. Imaging has helped to identify the pathological substrate of polymyalgia rheumatica and it is increasingly used to support clinical diagnosis or to detect coexistent giant cell arteritis. Although polymyalgia rheumatica does not clearly impair survival or organ function, it can have a detrimental effect on quality of life. Glucocorticoids at 12·5-25·0 mg prednisone per day are effective in inducing remission in most individuals but, when tapered, relapses occur in 40-60% of those affected and side-effects are common. Assessment of disease activity can be difficult because pain related to common comorbidities such as osteoarthritis and tendinopathies, can return when glucocorticoids are reduced, and acute phase reactants are increased less during flares in individuals undergoing treatment or might increase for other reasons. The role of imaging in assessing disease activity is not yet completely defined. In the search for more efficient and safer therapies, tocilizumab and sarilumab have shown efficacy in randomised controlled trials and additional targeted therapies are emerging. However, judicious risk-benefit balance is essential in applying therapeutic innovations to people with polymyalgia rheumatica.

Giant Cell Arteritis and Polymyalgia Rheumatica: Treatment Approaches and New Targets

Prolonged glucocorticoid tapers have been the standard of care for giant cell arteritis (GCA) and polymyalgia rheumatica (PMR), but recent advancements have improved outcomes for patients with GCA while reducing glucocorticoid-related toxicities. Many patients with GCA and PMR still experience persistent or relapsing disease, and cumulative exposure to glucocorticoids for both diseases remains high. The objective of this review is to define current treatment approaches as well as new therapeutic targets and strategies. Studies investigating inhibition of cytokine pathways, including interleukin-6, interleukin-17, interleukin-23, granulocyte-macrophage colony-stimulating factor, Janus kinase-signal transduction and activator of transcription, and others, will be reviewed.

Biomarkers in the era of targeted therapy in giant cell arteritis and polymyalgia rheumatica: is it possible to replace acute-phase reactants?

Research into giant cell arteritis (GCA) and polymyalgia rheumatica (PMR) has become more important in the last few decades. Physicians are facing several challenges in managing the diagnosis, treatment, and relapses of GCA and PMR patients. The search for biomarkers could provide elements to guide a physician's decision. In this review, we aim to summarize the scientific publications about biomarkers in GCA and PMR in the past decade. The first point raised by this review is the number of clinical situations in which biomarkers could be useful: differential diagnosis of either GCA or PMR, diagnosis of underlying vasculitis in PMR, prediction of relapse or complications, disease activity monitoring, choice, and modification of treatments. The second point raised by this review is the large number of biomarkers studied, from common markers like C-reactive protein, erythrocyte sedimentation rate, or elements of blood count to inflammatory cytokines, growth factors, or immune cell subpopulations. Finally, this review underlines the heterogeneity between the studies and proposes points to consider in studies evaluating biomarkers in general and particularly in the case of GCA and PMR.

Biologic therapy in large and small vessels vasculitis, and Behçet's disease: Evidence- and practice-based guidance

OBJECTIVE

Vasculitis are a very heterogenous group of systemic autoimmune diseases, affecting large vessels (LVV), small vessels or presenting as a multisystemic variable vessel vasculitis. We aimed to define evidence and practice-based recommendations for the use of biologics in large and small vessels vasculitis, and Behçet's disease (BD).

METHODS

Recommendations were made by an independent expert panel, following a comprehensive literature review and two consensus rounds. The panel included 17 internal medicine experts with recognized practice on autoimmune diseases management. The literature review was systematic from 2014 until 2019 and later updated by cross-reference checking and experts' input until 2022. Preliminary recommendations were drafted by working groups for each disease and voted in two rounds, in June and September 2021. Recommendations with at least 75% agreement were approved.

RESULTS

A total of 32 final recommendations (10 for LVV treatment, 7 for small vessels vasculitis and 15 for BD) were approved by the experts and several biologic drugs were considered with different supporting evidence. Among LVV treatment options, tocilizumab presents the higher level of supporting evidence. Rituximab is recommended for treatment of severe/refractory cryoglobulinemic vasculitis. Infliximab and adalimumab are most recommended in treatment of severe/refractory BD manifestations. Other biologic drugs can be considered is specific presentations.

CONCLUSION

These evidence and practice-based recommendations are a contribute to treatment decision and may, ultimately, improve the outcome of patients living with these conditions.

Recent advances in the treatment of giant cell arteritis

Giant cell arteritis (GCA) is a systemic, granulomatous, large-vessel vasculitis that affects individuals over the age of 50 years. Morbidity from disease includes cranial manifestations which can cause irreversible blindness, while extra-cranial manifestations can cause vascular damage with large-artery stenosis, occlusions, aortitis, aneurysms, and dissections. Glucocorticoids while efficacious are associated with significant adverse effects. Furthermore, despite treatment with glucocorticoids, relapses are common. An understanding of the pathogenesis of GCA has led to the discovery of tocilizumab as an efficacious steroid-sparing therapy while additional therapeutic targets affecting different inflammatory pathways are under investigation. Surgical treatment may be indicated in cases of refractory ischemia or aortic complications but data on surgical outcomes are limited. Despite the recent advances, many unmet needs exist, including the identification of patients or subsets of GCA who would benefit from earlier initiation of adjunctive therapies, patients who may warrant long-term immunosuppression and medications that sustain permanent remission. The impact of medications like tocilizumab on long-term outcomes, including the development of aortic aneurysms and vascular damage also warrants investigation.

Steroid sparing in vasculitis: Myth or reality?

Glucocorticoids are the cornerstone of therapy for all forms of vasculitis. However, glucocorticoid treatment carries with it the risk of glucocorticoid toxicity. Recent research efforts in vasculitis have emphasized investigation into strategies that reduce glucocorticoid exposure. These strategies include the adoption of rapid-acting steroid-sparing agents, reduced-dose glucocorticoid induction regimens, the early introduction of steroid-sparing agents for maintenance therapy, and the extension of maintenance therapy to minimize glucocorticoid exposure associated with disease relapse. These are critical advances to move us toward the goal of glucocorticoid-free treatment of vasculitis. The evidence supporting each of these strategies and directions for future research are explored.

What is a response in randomised controlled trials in giant cell arteritis?

Glucocorticoids (GCs) are the gold standard for treatment of giant cell arteritis (GCA); however, there is a need for studies on GC-sparing agents, given that up to 85% of patients receiving GC only develop adverse events. Previous randomised controlled trials (RCTs) have applied different primary endpoints, limiting the comparison of treatment effects in meta-analyses and creating an undesired heterogeneity of outcomes. The harmonisation of response assessment is therefore an important unmet need in GCA research. In this viewpoint article, we discuss the challenges and opportunities with the development of new, internationally accepted response criteria. A change of disease activity is a fundamental component of response; however, it is debatable whether the ability to taper GC and/or the maintenance of a disease state for a specific time period, as applied in recent RCTs, should be part of response assessment. The role of imaging and novel laboratory biomarkers as possible objective markers of disease activity needs further investigation but might be a possibility when drugs directly or indirectly influence the levels of traditional acute-phase reactants such as erythrocyte sedimentation rate and C reactive protein. Futures response criteria might be constructed as a multidomain set, but the questions about which domains will be included and what their relative weights will be still need to be answered.

A case of giant cell arteritis complicated by polymyalgia rheumatica with scalp necrosis and refractory jaw claudication

Scalp necrosis is a rare complication of giant cell arteritis (GCA); however, it is a predictor of severe disease. In this case study, a patient presented with GCA complicated by polymyalgia rheumatica with scalp necrosis. An 86-year-old woman was admitted to the hospital for pulsating headache, scalp pain, jaw claudication, and generalised pain. Bilateral temporal arteries were found to be distended and pulseless, and scalp necrosis was observed in the parietal region. Simultaneous high-resolution contrast-enhanced magnetic resonance imaging (MRI) sequences of the head, shoulder, and hip showed staining around the bilateral shallow temporal arteries, shoulder, and hip joints, which was confirmed as GCA with polymyalgia rheumatica using other examination findings. After treatment with early induction remission therapy, scalp necrosis healed, but jaw claudication persisted. Six months after the start of treatment, scalp necrosis was cured to full hair growth. Despite remission induction therapy combined with tocilizumab, the patient had persistent jaw claudication for several months. At that time, a high-resolution contrast-enhanced MRI re-examination was useful in assessing disease activity. GCA with scalp necrosis may cause prolonged jaw claudication reflecting the progression of ischaemic lesions, whereas the disease activity can be accurately assessed by combining MRI studies.

Giant cell arteritis: Update on clinical manifestations, diagnosis, and management

Giant cell arteritis (GCA) is the most common vasculitis affecting people older than 50 years. The last decades have shed new light on the clinical paradigm of this condition, expanding its spectrum beyond cranial vessel inflammation. GCA can be now considered a multifaceted vasculitic syndrome encompassing inflammation of cranial and extra-cranial arteries and girdles, isolated or combined. Such heterogeneity often leads to diagnostic delays and increases the likelihood of acute and chronic GCA-related damage. On the other hand, the approach to suspected GCA patients has been revolutionized by the introduction of vascular ultrasound which allows a rapid, cost-effective, and non-invasive GCA diagnosis. Likewise, the use of tocilizumab is now part of the therapeutic algorithm of GCA and ensures a satisfactory disease control even in steroid-refractory patients. Nonetheless, some aspects of GCA still need to be clarified, including the clinical correlation of different histological patterns, and the prevention of long-term vascular complications. This narrative review depicts the diagnostic and therapeutic aspects of GCA most relevant in clinical practice, with a focus on clinical updates and novelties introduced over the last decade.

Pan American League of Associations for Rheumatology guidelines for the treatment of giant cell arteritis

Considerable variability exists in the way that health-care providers treat patients with giant cell arteritis in Latin America, with patients commonly exposed to excessive amounts of glucocorticoids. In addition, large health disparities prevail in this region due to socioeconomic factors, which influence access to care, including biological treatments. For these reasons, the Pan American League of Associations for Rheumatology developed the first evidence-based giant cell arteritis treatment guidelines tailored for Latin America. A panel of vasculitis experts from Mexico, Colombia, Peru, Brazil, and Argentina generated clinically meaningful questions related to the treatment of giant cell arteritis in the population, intervention, comparator, and outcome (PICO) format. Following the grading of recommendations, assessment, development, and evaluation methodology, a team of methodologists did a systematic literature search, extracted and summarised the effects of the interventions, and graded the quality of the evidence. The panel of vasculitis experts voted on each PICO question and made recommendations, which required at least 70% agreement among the voting members to be included in the guidelines. Nine recommendations and one expert opinion statement for the treatment of giant cell arteritis were developed considering the most up-to-date evidence and the socioeconomic characteristics of Latin America. These recommendations include guidance for the use of glucocorticoids, tocilizumab, methotrexate, and aspirin for patients with giant cell arteritis.

Intravenous tocilizumab for the treatment of giant cell arteritis: a phase Ib dose-ranging pharmacokinetic bridging study

Background

Subcutaneous tocilizumab (TCZ SC) is approved globally for giant cell arteritis (GCA). This phase Ib study investigated the pharmacokinetics, pharmacodynamics, safety, and exploratory efficacy of intravenous (IV) TCZ 6 and 7 mg/kg in patients with GCA. This study explored an IV dose resulting in a minimum exposure level within the range of effective trough concentrations achieved with TCZ SC dosing in GCA and not exceeding the exposure of the well-tolerated 8 mg/kg IV every 4 weeks (Q4W) in rheumatoid arthritis (RA).

Methods

Patients with GCA who had received ≥ 5 doses of TCZ IV 8 mg/kg Q4W and achieved remission were enrolled. Patients received 5 doses of TCZ IV 7 mg/kg Q4W in period 1 and, if still in remission, 5 doses of 6 mg/kg Q4W in period 2. Pharmacokinetic endpoints were maximum concentration (C_max), minimum concentration (C_trough), area under the curve over a dosing interval (AUC_τ), and mean concentration (C_mean) of TCZ after the last dose of each period. Other endpoints included pharmacodynamic markers, safety, and exploratory efficacy.

Results

In 24 patients, the median (range) age was 65.5 (57–90) years, and 62.5% were female. TCZ exposures (C_max and AUC_τ) were 11.2% and 20.0% lower at the 6- than 7-mg/kg dose. The mean interleukin 6 (IL-6) serum concentrations were elevated at baseline and remained elevated, with slightly higher concentrations in period 1 than in period 2. The mean serum soluble IL-6 receptor concentrations were elevated at baseline and comparable between the 2 doses at steady state. C-reactive protein levels and most erythrocyte sedimentation rates were within normal ranges throughout the study. Overall, 22 patients (91.7%) had ≥ 1 adverse event, and 4 (16.7%) had a serious adverse event. No patients experienced a GCA flare, and all remained in remission throughout the study.

Conclusions

Both doses of TCZ IV Q4W were generally well tolerated in patients with GCA. The C_max and C_mean achieved with 6 mg/kg IV Q4W in patients with GCA were similar to those in patients with RA treated with 8 mg/kg IV Q4W, and C_trough was within the range observed in patients with GCA treated with SC dosing every week or every 2 weeks.

Trial registration

ClinicalTrials.gov, NCT03923738

Does Tocilizumab Influence Ophthalmic Outcomes in Giant Cell Arteritis?

BACKGROUND

Despite appropriate use of corticosteroids, an important minority of patients with giant cell arteritis (GCA) develop progressive vision loss during the initial stages of the disease or during corticosteroid tapering. Tocilizumab is the only clearly effective adjunctive treatment to corticosteroids in the management of GCA, but questions regarding its efficacy specifically in the neuro-ophthalmic population and its role in mitigating vision loss have not been broached until recently.

EVIDENCE ACQUISITION

The authors queried Pubmed using the search terms "GCA" and "tocilizumab" in order to identify English-language publications either explicitly designed to evaluate the influence of tocilizumab on the ophthalmic manifestations of GCA or those which reported, but were not primarily focused on, ophthalmic outcomes.

RESULTS

Recent retrospective analyses of populations similar to those encountered in neuro-ophthalmic practice suggest that tocilizumab is effective in decreasing the frequency of GCA relapse, the proportion of flares involving visual manifestations of GCA, and the likelihood of permanent vision loss. Data regarding the utility of tocilizumab to curtail vision loss at the time of diagnosis are limited to case reports.

CONCLUSIONS

Compared with conventional corticosteroid monotherapy, treatment of GCA with both corticosteroids and tocilizumab may decrease the likelihood of permanent vision loss. Further prospective, collaborative investigation between rheumatologists and neuro-ophthalmologists is required to clarify the ophthalmic and socioeconomic impact of tocilizumab on the treatment of GCA.

Tocilizumab for giant cell arteritis

BACKGROUND

Giant cell arteritis (GCA) is the most common form of systemic vasculitis in people older than 50 years of age. It causes granulomatous inflammation of medium- to large-sized vessels. Tocilizumab is a recombinant monoclonal antibody directed against interleukin-6 receptors (IL-6R).

OBJECTIVES

To assess the effectiveness and safety of tocilizumab, given alone or with corticosteroids, compared with therapy without tocilizumab for treatment of GCA.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (which contains the Cochrane Eyes and Vision Trials Register) (2020, Issue 1); Ovid MEDLINE; Embase.com; PubMed; Latin American and Caribbean Health Science Information database (LILACS); ClinicalTrials.gov; and the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP). There were no date or language restrictions in the electronic search for trials. We last searched the electronic databases on 3 January 2020.

SELECTION CRITERIA

We included only randomized controlled trials (RCTs) that compared tocilizumab of any dosage regimen (alone or with corticosteroids) with therapy without tocilizumab that had a minimum follow-up of six months. Participants were at least 50 years of age, with biopsy-proven GCA or by large-vessel vasculitis by angiography, and met the American College of Rheumatology 1990 guidelines for GCA.

DATA COLLECTION AND ANALYSIS

We used standard Cochrane methodology.

MAIN RESULTS

Main results We included two RCTs in the review. The studies were conducted in the USA, Canada, and Europe and enrolled a total of 281 participants with GCA, of whom 74% were women. The mean age of participants was 70 years, with new-onset or relapsing GCA, and fulfilled the 1990 American College of Rheumatology criteria with no uncontrolled comorbidities. Both studies were funded by F. Hoffmann-La Roche AG, the manufacturer of tocilizumab. Findings One RCT (30 participants) compared tocilizumab administered every four weeks versus placebo. Point estimates at 12 months and beyond favored tocilizumab over placebo in terms of sustained remission (risk ratio (RR) 4.25, 95% confidence interval (CI) 1.21 to 14.88; moderate-certainty evidence). Point estimates suggest no evidence of a difference for all-cause mortality at 12 months or more (RR 0.17, 95% CI 0.01 to 3.94; moderate-certainty evidence). At 12 months, mean time to first relapse after induction of remission was 25 weeks in favor of participants receiving tocilizumab compared to placebo (mean difference (MD) 25, 95% CI 11.4 to 38.6; moderate-certainty evidence). The second RCT (250 participants) randomized participants into two intervention and two comparator groups to receive tocilizumab weekly (100 participants), bi-weekly (49 participants), weekly placebo + 26-week taper (50 participants), or weekly placebo + 52-week taper (51 participants). At 12 months, point estimates from this study on proportion of participants with sustained remission favored participants who received tocilizumab weekly versus placebo + 52-week taper (RR 3.17, 95% CI 1.71 to 5.89; 151 participants); tocilizumab weekly versus placebo + 26-week taper (RR 4.00, 95% CI 1.97 to 8.12; 150 participants); tocilizumab every other week versus placebo + 52-week taper (RR 3.01, 95% CI 1.57 to 5.75; 100 participants); tocilizumab every other week versus placebo + 26-week taper (RR 3.79, 95% CI 1.82 to 7.91; 99 participants) (moderate-certainty evidence). Point estimates on proportion of participants who did not need escape therapy (defined by the study as the inability to keep to the protocol-defined prednisone taper) favored participants who received tocilizumab weekly versus placebo + 52-week taper (RR 1.71, 95% CI 1.24 to 2.35; 151 participants); tocilizumab weekly versus placebo + 26-week taper (RR 2.96, 95% CI 1.83 to 4.78; 150 participants); tocilizumab every other week versus placebo + 52-week taper (RR 1.49, 95% CI 1.04 to 2.14; 100 participants) but not tocilizumab every other week versus placebo + 26-week taper (RR 0.65, 95% CI 0.27 to 1.54; 99 participants) (moderate-certainty evidence). This study did not report mean time to first relapse after induction of remission or all-cause mortality.  Across comparison groups, the same study found no evidence of a difference  in vision changes and inconsistent evidence with regard to quality of life. Evidence on quality of life as assessed by the physical (MD 8.17, 95% CI 4.44 to 11.90) and mental (MD 5.61, 95% CI 0.06 to 11.16) component score of the 36-Item Short Form Health Survey (SF-36) favored weekly tocilizumab versus placebo + 52-week taper but not bi-weekly tocillizumab versus placebo + 26-week taper (moderate-certainty evidence). Adverse events One RCT reported a lower percentage of participants who experienced serious adverse events when receiving tocilizumab every four weeks versus placebo. The second RCT reported no evidence of a difference among groups with regard to adverse events; however, fewer participants reported serious adverse events in the tocilizumab weekly and tocilizumab biweekly interventions compared with the placebo + 26-week taper and placebo + 52-week taper comparators. Investigators in both studies reported that infection was the most frequently reported adverse event.

AUTHORS' CONCLUSIONS

This review indicates that tocilizumab therapy may be beneficial in terms of proportion of participants with sustained remission, relapse-free survival, and the need for escape therapy. While the evidence was of moderate certainty, only two studies were included in the review, suggesting that further research is required to corroborate these findings. Future trials should address issues related to the required duration of therapy, patient-reported outcomes such as quality of life and economic outcomes, as well as the clinical outcomes evaluated in this review.

Utility of serum complement factors C3 and C4 as biomarkers during therapeutic management of giant cell arteritis

OBJECTIVE

There is a strong unmet need for biomarkers in giant cell arteritis (GCA), as C-reactive protein (CRP) may be unreliable in patients treated with Tocilizumab (TCZ). We aimed to assess whether C3 and C4 are useful biomarkers in GCA patients, particularly in those treated with TCZ.

METHOD

We retrospectively enrolled all patients who underwent C3 and C4 measurement at baseline. All patients were evaluated at 3, 6, 12, and 24 months after diagnosis, as part of routine follow-up. Two assessments after the end of the observational period, in case of further relapses, were also included.

RESULTS

At baseline, mean ± sd levels (mg/dL) of C3 (133 ± 28.99) and C4 (25.9 ± 9.04) were within normal ranges. During follow-up, C3 and C4 decreased in patients attaining remission (107.07 ± 19.86, p = 0.0006; 19.86 ± 10.27, p = 0.01, respectively) and sustained remission (95.85 ± 18.04, p = 0.001; 15.61 ± 9.75, p = 0.006). In TCZ-treated patients, even stronger decreases in C3 (83.11 ± 19.66, p = 0.001) and C4 (8.26 ± 3.83, p < 0.0001) were observed, and their values were not correlated with CRP or erythrocyte sedimentation rate.

CONCLUSION

C3 and C4 do not seem useful in the diagnosis of GCA, as normal values do not rule out active vasculitis. However, C3 and C4 correlate with disease activity. As the low C4 levels found in TCZ-treated patients are not correlated with CRP, C4 should be evaluated as a potential biomarker of disease activity and treatment response.

Advances in the Treatment of Giant Cell Arteritis

Giant cell arteritis (GCA) is the most common vasculitis among elderly people. The clinical spectrum of the disease is heterogeneous, with a classic/cranial phenotype, and another extracranial or large vessel phenotype as the two more characteristic patterns. Permanent visual loss is the main short-term complication. Glucocorticoids (GC) remain the cornerstone of treatment. However, the percentage of relapses with GC alone is high, and the rate of adverse events affects more than 80% of patients, so it is necessary to have alternative therapeutic options, especially in patients with worse prognostic factors or high comorbidity. MTX is the only DMARD that has shown to reduce the cumulative dose of GC, while tocilizumab is the first biologic agent approved due to its ability to decrease the relapse rate and lower the cumulative GC doses. However, apart from the IL-6 pathway, there are other pro-inflammatory cytokines and growth factors involved in the typical intima hyperplasia and vascular remodeling of GCA. Among them, the more promising targets in GCA treatment are the IL12/IL23 axis antagonists, IL17 inhibitors, modulators of T lymphocytes, and inhibitors of either the JAK/STAT pathway, the granulocyte-macrophage colony-stimulating factor, or the endothelin, all of which are updated in this review.

Efficacy and safety of mavrilimumab in giant cell arteritis: a phase 2, randomised, double-blind, placebo-controlled trial

Objectives

Granulocyte-macrophage colony-stimulating factor (GM-CSF) is implicated in pathogenesis of giant cell arteritis. We evaluated the efficacy of the GM-CSF receptor antagonist mavrilimumab in maintaining disease remission.

Methods

This phase 2, double-blind, placebo-controlled trial enrolled patients with biopsy-confirmed or imaging-confirmed giant cell arteritis in 50 centres (North America, Europe, Australia). Active disease within 6 weeks of baseline was required for inclusion. Patients in glucocorticoid-induced remission were randomly assigned (3:2 ratio) to mavrilimumab 150 mg or placebo injected subcutaneously every 2 weeks. Both groups received a 26-week prednisone taper. The primary outcome was time to adjudicated flare by week 26. A prespecified secondary efficacy outcome was sustained remission at week 26 by Kaplan-Meier estimation. Safety was also assessed.

Results

Of 42 mavrilimumab recipients, flare occurred in 19% (n=8). Of 28 placebo recipients, flare occurred in 46% (n=13). Median time to flare (primary outcome) was 25.1 weeks in the placebo group, but the median was not reached in the mavrilimumab group (HR 0.38; 95% CI 0.15 to 0.92; p=0.026). Sustained remission at week 26 was 83% for mavrilimumab and 50% for placebo recipients (p=0.0038). Adverse events occurred in 78.6% (n=33) of mavrilimumab and 89.3% (n=25) of placebo recipients. No deaths or vision loss occurred in either group.

Conclusions

Mavrilimumab plus 26 weeks of prednisone was superior to placebo plus 26 weeks of prednisone for time to flare by week 26 and sustained remission in patients with giant cell arteritis. Longer treatment is needed to determine response durability and quantify the glucocorticoid-sparing potential of mavrilimumab.

Trial registration number

ClinicalTrials.gov number: NCT03827018, Europe (EUdraCT number: 2018-001003-36), and Australia (CT-2018-CTN-01 865-1).

Need and value of targeted immunosuppressive therapy in giant cell arteritis

Despite the heterogeneity of the giant cell arteritis (GCA) at the level of clinical manifestations and the cellular and molecular players involved in its pathogenesis, GCA is still treated with standardised regimens largely based on glucocorticoids (GC). Long-term use of high dosages of GC as required in GCA are associated with many clinically relevant side effects. In the recent years, the interleukin-6 receptor blocker tocilizumab has become available as the only registered targeted immunosuppressive agent in GCA. However, immunological heterogeneity may require different pathways to be targeted in order to achieve a clinical, immunological and vascular remission in GCA. The advances in the targeted blockade of various molecular pathways involved in other inflammatory and autoimmune diseases have catalyzed the research on targeted therapy in GCA. This article gives an overview of the studies with targeted immunosuppressive treatments in GCA, with a focus on their clinical value, including their effects at the level of vascular inflammation.

From Active to Non-active Giant Cell Arteritis: Longitudinal Monitoring of Patients on Glucocorticoid Therapy in Combination With Leflunomide

In the present study, we longitudinally monitored leukocyte subsets, expression of neutrophil surface adhesion molecules (CD62L and CD11b) and serum analytes in therapy-naïve patients with active giant cell arteritis (GCA). We collected blood samples at the baseline, and at weeks 1, 4, 12, 24, and 48 of follow-up, and evaluated short- and long-term effects of glucocorticoids (GC) vs. GC and leflunomide. Our aim was to identify candidate biomarkers that could be used to monitor disease activity and predict an increased risk of a relapse. Following high doses of GC, the numbers of CD4+ T-lymphocytes and B-lymphocytes transiently increased and then subsided when GC dose tapering started at week 4. In contrast, the numbers of neutrophils significantly increased during the follow-up time of 12 weeks compared to pre-treatment time. Neutrophil CD62L rapidly diminished after initiation of GC therapy, however its expression remained low at week 48, only in patients under combinatorial therapy with leflunomide. Levels of acute phase reactant SAA and IL-6 decreased significantly after treatment with GC and leflunomide, while levels of IL-8, IL-18, and CHI3L1 did not change significantly during the follow-up period. CHI3L1 was associated with signs of transmural inflammation and vessel occlusion and might therefore serve as a marker of fully developed active GCA, and a promising therapeutic target. Patients with relapses had higher levels of IL-23 at presentation than patients without relapses (p = 0.021). Additionally, the levels of IL-23 were higher at the time of relapse compared to the last follow-up point before relapse. IL-23 might present a promising biomarker of uncontrolled and active disease and could give early indication of upcoming relapses.

Blocking GM-CSF receptor α with mavrilimumab reduces infiltrating cells, pro-inflammatory markers and neoangiogenesis in ex vivo cultured arteries from patients with giant cell arteritis

Background

Effective and safe therapies are needed for the treatment of patients with giant cell arteritis (GCA). Emerging as a key cytokine in inflammation, granulocyte-macrophage colony stimulating factor (GM-CSF) may play a role in promoting inflammation in GCA.

Objectives

To investigate expression of GM-CSF and its receptor in arterial lesions from patients with GCA. To analyse activation of GM-CSF receptor-associated signalling pathways and expression of target genes. To evaluate the effects of blocking GM-CSF receptor α with mavrilimumab in ex vivo cultured arteries from patients with GCA.

Methods

Quantitative real time PCR, in situ RNA hybridisation, immunohistochemistry, immunofluorescence and confocal microscopy, immunoassay, western blot and ex vivo temporal artery culture.

Results

GM-CSF and GM-CSF receptor α mRNA and protein were increased in GCA lesions; enhanced JAK2/STAT5A expression/phosphorylation as well as increased expression of target genes CD83 and Spi1/PU.1 were observed. Treatment of ex vivo cultured GCA arteries with mavrilimumab resulted in decreased transcripts of CD3ε, CD20, CD14 and CD16 cell markers, and reduction of infiltrating CD16 and CD3ε cells was observed by immunofluorescence. Mavrilimumab reduced expression of molecules relevant to T cell activation (human leukocyte antigen-DR [HLA-DR]) and Th1 differentiation (interferon-γ), the pro-inflammatory cytokines: interleukin 6 (IL-6), tumour necrosis factor α (TNFα) and IL-1β, as well as molecules related to vascular injury (matrix metalloprotease 9, lipid peroxidation products and inducible nitric oxide synthase [iNOS]). Mavrilimumab reduced CD34 + cells and neoangiogenesis in GCA lesions.

Conclusion

The inhibitory effects of mavrilimumab on multiple steps in the GCA pathogenesis cascade in vitro are consistent with the clinical observation of reduced GCA flares in a phase 2 trial and support its development as a therapeutic option for patients with GCA.

[Biologics for connective tissue diseases and vasculitides]

Despite therapy with glucocorticoids (GC) and conventional immunosuppressants, patients with connective tissue diseases and vasculitides often develop functionally relevant and prognostically unfavourable internal organ damage. Based on new pathogenetic insights, biologics and small molecules have recently been studied as targeted therapies for collagen vascular diseases and vasculitides. The B lymphocyte stimulator antagonist belimumab has been used for the treatment of systemic lupus erythematosus (SLE) for several years and has recently also been approved as an add-on therapy for lupus nephritis. Anifrolumab, an antibody against the type‑1 interferon receptor, has also been shown to be effective in phase III trials for the treatment of SLE. The interleukin (IL)-6-antagonist tocilizumab showed efficacy in the treatment of interstitial lung disease (ILD) in systemic sclerosis (SSc) and thus has been approved in the USA, although the phase III trial had a negative primary endpoint. In Europe the tyrosine inhibitor nintedanib is approved for progressive ILD in SSc. Tocilizumab is approved for the treatment of giant cell arteritis and reduces both the risk of recurrence and the cumulative GC requirement. The B‑lymphocyte depleting antibody rituximab is approved for induction and maintenance therapy of granulomatosis with polyangiitis and microscopic polyangiitis (MPA) and is currently also being investigated for the treatment of eosinophilic granulomatosis with polyangiitis (EGPA). In patients with EGPA, the IL‑5 antibody mepolizumab leads to improved disease control and reduces GC requirements. A phase III trial of the small molecule antagonist avacopan targeting the complement C5a receptor as a replacement for high-dose GC in induction therapy of GPA and MPA met its primary endpoints. Various other biologics and small molecule antagonists are currently in clinical development for several type of vasculitis and collagen vascular diseases, some of them at advanced stages.

Large-vessel vasculitis

Large-vessel vasculitis (LVV) manifests as inflammation of the aorta and its major branches and is the most common primary vasculitis in adults. LVV comprises two distinct conditions, giant cell arteritis and Takayasu arteritis, although the phenotypic spectrum of primary LVV is complex. Non-specific symptoms often predominate and so patients with LVV present to a range of health-care providers and settings. Rapid diagnosis, specialist referral and early treatment are key to good patient outcomes. Unfortunately, disease relapse remains common and chronic vascular complications are a source of considerable morbidity. Although accurate monitoring of disease activity is challenging, progress in vascular imaging techniques and the measurement of laboratory biomarkers may facilitate better matching of treatment intensity with disease activity. Further, advances in our understanding of disease pathophysiology have paved the way for novel biologic treatments that target important mediators of disease in both giant cell arteritis and Takayasu arteritis. This work has highlighted the substantial heterogeneity present within LVV and the importance of an individualized therapeutic approach. Future work will focus on understanding the mechanisms of persisting vascular inflammation, which will inform the development of increasingly sophisticated imaging technologies. Together, these will enable better disease prognostication, limit treatment-associated adverse effects, and facilitate targeted development and use of novel therapies.

Establishing Clinical Remission Criteria and the Framework of a Treat-To-Target Algorithm for Takayasu arteritis: Results of a Delphi Exercise Carried out by an Expert Panel of the Japan Research Committee of the Ministry of Health, Labour, and Welfare for intractable vasculitis

OBJECTIVE

To develop a proposal for remission criteria and a framework for a treat-to-target (T2T) algorithm for Takayasu arteritis (TAK).

METHODS

A study group of the large-vessel vasculitis group of the Japanese Research Committee of the Ministry of Health, Labour, and Welfare for Intractable Vasculitis (JPVAS) consists of 10 rheumatologists, 5 cardiologists, 1 nephrologist, 1 vascular surgeon, 1 cardiac surgeon, and 2 pediatric rheumatologists. A Delphi survey of remission criteria items was circulated among the study group over 4 reiterations. To develop the T2T algorithm, the study group conducted four face-to-face meetings and two rounds of Delphi together with 3 patients.

RESULTS

Initial literature review resulted in a list of 117 candidate items for remission criteria, of which 56 items with a mean score of ≥4 (0-5) were extracted including disease activity domains and treatment/comorbidity domains. The study group provided six overarching principles for the T2T algorithm, two recommendations on treatment goals, five on evaluation of disease activity and imaging findings including PET-CT, and two on treatment intensification.

CONCLUSIONS

We developed a T2T algorithm and proposals for standardized remission criteria by means of a Delphi exercise. These will guide future evaluation of different TAK treatment regimens.

Functionally Heterogenous Macrophage Subsets in the Pathogenesis of Giant Cell Arteritis: Novel Targets for Disease Monitoring and Treatment

Giant cell arteritis (GCA) is a granulomatous large-vessel vasculitis that affects adults above 50 years of age. In GCA, circulating monocytes are recruited to the inflamed arteries. With cues from the vascular microenvironment, they differentiate into macrophages and play important roles in the pathogenesis of GCA via pro-inflammatory cytokine production and vascular remodeling. However, a deeper understanding of macrophage heterogeneity in GCA pathogenesis is needed to assist the development of novel diagnostic tools and targeted therapies. Here, we review the current knowledge on macrophage heterogeneity and diverse functions of macrophage subsets in the pathogenesis of GCA. We next discuss the possibility to exploit their heterogeneity as a source of novel biomarkers and as targets for nuclear imaging. Finally, we discuss novel macrophage-targeted therapies and future directions for targeting these cells in GCA.

Role of the halo sign in the assessment of giant cell arteritis: a systematic review and meta-analysis

Objectives

This systematic review and meta-analysis aimed to evaluate the diagnostic value of the halo sign in the assessment of GCA.

Methods

A systematic literature review was performed using MEDLINE, EMBASE and Cochrane central register databases up to August 2020. Studies informing on the sensitivity and specificity of the US halo sign for GCA (index test) were selected. Studies with a minimum of five participants were included. Study articles using clinical criteria, imaging such as PET-CT and/or temporal artery biopsy (TAB) as the reference standards were selected. Meta-analysis was conducted with a bivariate model.

Results

The initial search yielded 4023 studies. Twenty-three studies (patients n = 2711) met the inclusion criteria. Prospective (11 studies) and retrospective (12 studies) studies in academic and non-academic centres were included. Using clinical diagnosis as the standard (18 studies) yielded a pooled sensitivity of 67% (95% CI: 51, 80) and a specificity of 95% (95% CI: 89, 98%). This gave a positive and negative likelihood ratio for the diagnosis of GCA of 14.2 (95% CI: 5.7, 35.5) and 0.375 (95% CI: 0.22, 0.54), respectively. Using TAB as the standard (15 studies) yielded a pooled sensitivity of 63% (95% CI: 50, 75) and a specificity of 90% (95% CI: 81, 95).

Conclusion

The US halo sign is a sensitive and specific approach for GCA assessment and plays a pivotal role in diagnosis of GCA in routine clinical practice.

Registration

PROSPERO 2020 CRD42020202179.

Glucocorticoid dosing and relapses in giant cell arteritis-a single center cohort study

OBJECTIVE

To investigate the relationship between real life glucocorticoid (GC) dosing and relapse rates in patients with new onset giant cell arteritis (GCA) in a single center.

METHODS

Complete clinical data taken from the inpatient and outpatient records of consecutive GCA patients followed beyond stopping GC were retrospectively analyzed for GC doses, other immunomodulatory agents and relapses.

RESULTS

We included 54 patients with GCA confirmed by biopsy or imaging and followed over their complete GC course. In the 25% dose percentile, patients who needed no pulse therapy at onset reached a dose of 15 mg prednisolone or lower at day 40, of 7.5 mg prednisolone or lower on day 169 (after 24 weeks), and were off prednisolone on day 496 (70 weeks). They were below BSR-recommended doses between week 4 and week 12 and above these after week 14. The cumulative prednisolone dose reached in this 25% quartile was 3.74 g. Of the 54 patients, 24 (44%) relapsed, only 4 of whom had stopped GC clearly (17-58 weeks) earlier than the 25% dose quartile and one was distinctly (>10%) below the 25% GC percentile. Methotrexate treatment was not significantly associated with fewer relapses (p= 0.178).

CONCLUSION

Despite a long-term GC regimen with slow rates of reduction in the low dose range and high cumulative prednisolone doses, 44% of the patients relapsed. Only five (21%) of these relapses may have been prevented by adhering to the recommended GC regimen.

Tocilizumab for giant cell arteritis

BACKGROUND

Giant cell arteritis (GCA) is the most common form of systemic vasculitis in people older than 50 years of age. It causes granulomatous inflammation of medium- to large-sized vessels. Tocilizumab is a recombinant monoclonal antibody directed against interleukin-6 receptors (IL-6R).

OBJECTIVES

To assess the effectiveness and safety of tocilizumab, given alone or with corticosteroids, compared with therapy without tocilizumab for treatment of GCA.

SEARCH METHODS

We searched the Cochrane Central Register of Controlled Trials (CENTRAL) (which contains the Cochrane Eyes and Vision Trials Register) (2020, Issue 1); Ovid MEDLINE; Embase.com; PubMed; Latin American and Caribbean Health Science Information database (LILACS); ClinicalTrials.gov; and the World Health Organization (WHO) International Clinical Trials Registry Platform (ICTRP). There were no date or language restrictions in the electronic search for trials. We last searched the electronic databases on 3 January 2020.

SELECTION CRITERIA

We included only randomized controlled trials (RCTs) that compared tocilizumab of any dosage regimen (alone or with corticosteroids) with therapy without tocilizumab that had a minimum follow-up of six months. Participants were at least 50 years of age, with biopsy-proven GCA or by large-vessel vasculitis by angiography, and met the American College of Rheumatology 1990 guidelines for GCA.

DATA COLLECTION AND ANALYSIS

We used standard Cochrane methodology.

MAIN RESULTS

Main results We included two RCTs in the review. The studies were conducted in the USA, Canada, and Europe and enrolled a total of 281 participants with GCA, of whom 74% were women. The mean age of participants was 70 years, with new-onset or relapsing GCA, and fulfilled the 1990 American College of Rheumatology criteria with no uncontrolled comorbidities. Both studies were funded by F. Hoffmann-La Roche AG, the manufacturer of tocilizumab. Findings One RCT (30 participants) compared tocilizumab administered every four weeks versus placebo. Point estimates at 12 months and beyond favored tocilizumab over placebo in terms of sustained remission (risk ratio (RR) 4.25, 95% confidence interval (CI) 1.21 to 14.88; moderate-certainty evidence). Point estimates suggest no evidence of a difference for all-cause mortality at 12 months or more (RR 0.17, 95% CI 0.01 to 3.94; moderate-certainty evidence). At 12 months, mean time to first relapse after induction of remission was 25 weeks in favor of participants receiving tocilizumab compared to placebo (mean difference (MD) 25, 95% CI 11.4 to 38.6; moderate-certainty evidence). The second RCT (251 participants) randomized participants into two intervention and two comparator groups to receive tocilizumab weekly (100 participants), bi-weekly (49 participants), weekly placebo + 26-week taper (50 participants), or weekly placebo + 52-week taper (51 participants). At 12 months, point estimates from this study on proportion of participants with sustained remission favored participants who received tocilizumab weekly versus placebo + 52-week taper (RR 3.17, 95% CI 1.71 to 5.89; 151 participants); tocilizumab weekly versus placebo + 26-week taper (RR 4.00, 95% CI 1.97 to 8.12; 150 participants); tocilizumab every other week versus placebo + 52-week taper (RR 3.01, 95% CI 1.57 to 5.75; 100 participants); tocilizumab every other week versus placebo + 26-week taper (RR 3.79, 95% CI 1.82 to 7.91; 99 participants) (moderate-certainty evidence). Point estimates on proportion of participants who did not need escape therapy (defined by the study as the inability to keep to the protocol-defined prednisone taper) favored participants who received tocilizumab weekly versus placebo + 52-week taper (RR 1.71, 95% CI 1.24 to 2.35; 151 participants); tocilizumab weekly versus placebo + 26-week taper (RR 2.96, 95% CI 1.83 to 4.78; 150 participants); tocilizumab every other week versus placebo + 52-week taper (RR 1.49, 95% CI 1.04 to 2.14; 100 participants); tocilizumab every other week versus placebo + 26-week taper (RR 0.65, 95% CI 0.27 to 1.54; 99 participants) (moderate-certainty evidence). This study did not report mean time to first relapse after induction of remission or all-cause mortality. The same study found no evidence of a difference between groups with regard to vision changes and quality of life, except for the assessment of quality of life with the physical component score of the 36-Item Short Form Health Survey (SF-36), which favored weekly tocilizumab versus placebo + 52-week taper (MD 8.17, 95% CI 4.44 to 11.90; moderate-certainty evidence). Adverse events One RCT reported a lower percentage of participants who experienced serious adverse events when receiving tocilizumab every four weeks versus placebo. The second RCT reported no evidence of a difference among groups with regard to adverse events; however, fewer participants reported serious adverse events in the tocilizumab weekly and tocilizumab biweekly interventions compared with the placebo + 26-week taper and placebo + 52-week taper comparators. Investigators in both studies reported that infection was the most frequently reported adverse event.

AUTHORS' CONCLUSIONS

This review indicates that tocilizumab therapy may be beneficial in terms of proportion of participants with sustained remission, relapse-free survival, and the need for escape therapy. While the evidence was of moderate certainty, only two studies were included in the review, suggesting that further research is required to corroborate these findings. Future trials should address issues related to the required duration of therapy, patient-reported outcomes such as quality of life and economic outcomes, as well as the clinical outcomes evaluated in this review.

Ustekinumab for the Treatment of Giant Cell Arteritis

OBJECTIVE

To evaluate the efficacy and safety of ustekinumab (UST) in giant cell arteritis (GCA).

METHODS

We conducted a prospective, open-label trial of UST in patients with active new-onset or relapsing GCA. Active disease was defined as the presence of GCA symptoms and elevation of erythrocyte sedimentation rate (ESR) or C-reactive protein (CRP) level within 6 weeks of baseline. All patients received a 24-week prednisone taper and subcutaneous UST 90 mg at baseline and at weeks 4, 12, 20, 28, 36, and 44. The primary endpoint, prednisone-free remission, was defined as the absence of relapse through week 52 and normalization of the ESR and CRP level. Relapse was defined as the recurrence of GCA symptoms requiring treatment intensification. A sensitivity analysis excluding ESR/CRP level normalization from the prednisone-free remission definition was performed.

RESULTS

The study enrolled 13 patients (target sample size 20). Enrollment was closed prematurely after 7 of the initial 10 patients relapsed. Five patients (39%) had new-onset disease. The initial prednisone doses were 20 mg (1 patient), 40 mg (9 patients), and 60 mg (3 patients). All patients entered disease remission within 4 weeks of baseline. Only 3 (23%) achieved the primary endpoint. Of the 10 patients (77%) who failed to achieve the primary endpoint, 7 relapsed after a mean period of 23 weeks. The remaining 3 patients met the alternative definition of prednisone-free remission that did not require ESR/CRP level normalization. One serious adverse event occurred.

CONCLUSION

UST combined with 24 weeks of prednisone was associated with a high rate of treatment failure in this prospective GCA trial.

Current advances in giant cell arteritis

PURPOSE OF REVIEW

The aim of this study was to present the latest advances in giant cell arteritis (GCA) care, and recent national and international rheumatology societies guidance which influences clinical practice.

RECENT FINDINGS

Cranial ultrasound reduces diagnostic delay and improves clinical outcomes. Immediate high dose glucocorticoids remain the standard treatment for GCA. Controlled trial evidence using Tocilizumab, an interleukin-6 receptor antagonist, shows good clinical efficacy with steroid-sparing effects.

SUMMARY

Improved patient outcomes require formalizing pathways to diagnosis and closer liaison with rheumatology for long-term management with second-line therapies.

Ultrasound halo sign as a potential monitoring tool for patients with giant cell arteritis: a prospective analysis

OBJECTIVES

To assess the sensitivity to change of ultrasound halo features and their association with disease activity and glucocorticoid (GC) treatment in patients with newly diagnosed giant cell arteritis (GCA).

METHODS

Prospective study of patients with ultrasound-confirmed GCA who underwent serial ultrasound assessments of the temporal artery (TA) and axillary artery (AX) at fixed time points. The number of segments with halo and maximum halo intima-media thickness (IMT) was recorded. Time points in which >80% of patients were assessed were considered for analysis. Halo features at disease presentation and first relapse were compared.

RESULTS

49 patients were assessed at 354 visits. Halo sensitivity to change was assessed at weeks 1, 3, 6, 12 and 24 and showed a significant standardised mean difference between all time points and baseline for the TA halo features but only after week 6 for the AX halo features. The number of TA segments with halo and sum and maximum TA halo IMT showed a significant correlation with erythrocyte sedimentation rate (0.41, 0.44 and 0.48), C reactive protein (0.34, 0.39 and 0.41), Birmingham Vasculitis Activity Score (0.29, 0.36 and 0.35) and GC cumulative dose (-0.34, -0.37 and -0.32); no significant correlation was found for the AX halo features. Halo sign was present in 94% of first disease relapses but with a lower mean number of segments with halo and sum of halo IMT compared with disease onset (2.93±1.59 mm vs 4.85±1.51 mm, p=0.0012; 2.01±1.13 mm vs 4.49±1.95 mm, p=0.0012).

CONCLUSIONS

Ultrasound is a useful imaging tool to assess disease activity and response to treatment in patients with GCA.

A Distinct Macrophage Subset Mediating Tissue Destruction and Neovascularization in Giant Cell Arteritis: Implication of the YKL-40 - IL-13 Receptor α2 Axis

Objective

Macrophages mediate inflammation, angiogenesis, and tissue destruction in giant cell arteritis (GCA). Serum levels of the macrophage‐associated protein YKL‐40 (chitinase 3–like protein 1), previously linked to angiogenesis and tissue remodeling, remain elevated in GCA despite glucocorticoid treatment. This study was undertaken to investigate the contribution of YKL‐40 to vasculopathy in GCA.

Methods

Immunohistochemistry was performed on GCA temporal artery biopsy specimens (n = 12) and aortas (n = 10) for detection of YKL‐40, its receptor interleukin‐13 receptor α2 (IL‐13Rα2), macrophage markers PU.1 and CD206, and the tissue‐destructive protein matrix metalloproteinase 9 (MMP‐9). Ten noninflamed temporal artery biopsy specimens served as controls. In vitro experiments with granulocyte–macrophage colony‐stimulating factor (GM‐CSF)– or macrophage colony‐stimulating factor (M‐CSF)–skewed monocyte‐derived macrophages were conducted to study the dynamics of YKL‐40 production. Next, small interfering RNA–mediated knockdown of YKL‐40 in GM‐CSF–skewed macrophages was performed to study its effect on MMP‐9 production. Finally, the angiogenic potential of YKL‐40 was investigated by tube formation experiments using human microvascular endothelial cells (HMVECs).

Results

YKL‐40 was abundantly expressed by a CD206+MMP‐9+ macrophage subset in inflamed temporal arteries and aortas. GM‐CSF–skewed macrophages from GCA patients, but not healthy controls, released significantly higher levels of YKL‐40 compared to M‐CSF–skewed macrophages (P = 0.039). In inflamed temporal arteries, IL‐13Rα2 was expressed by macrophages and endothelial cells. Functionally, knockdown of YKL‐40 led to a 10–50% reduction in MMP‐9 production by macrophages, whereas exposure of HMVECS to YKL‐40 led to significantly increased tube formation.

Conclusion

In GCA, a GM‐CSF–skewed, CD206+MMP‐9+ macrophage subset expresses high levels of YKL‐40 which may stimulate tissue destruction and angiogenesis through IL‐13Rα2 signaling. Targeting YKL‐40 or GM‐CSF may inhibit macrophages that are currently insufficiently suppressed by glucocorticoids.

My Treatment Approach to Giant Cell Arteritis

Giant cell arteritis (GCA) is the most common primary systemic vasculitis in adults 50 years or older. Expanded use of advanced arterial imaging has assisted both in the diagnosis of GCA and recognition of disease subsets. Although glucocorticoids have been the mainstay of treatment for almost 7 decades, new therapeutic options have emerged. This review aims to provide the clinician with a pragmatic approach to evaluating and managing patients with GCA while also addressing recent diagnostic and therapeutic developments.

Treatment failure in giant cell arteritis

Objective

Identify predictors of treatment failure in patients with giant cell arteritis (GCA) receiving tocilizumab in combination with glucocorticoids and in patients with GCA receiving only glucocorticoids.

Methods

Posthoc analysis of the Giant-Cell Arteritis Actemra trial including 250 patients who received tocilizumab every week plus a 26-week prednisone taper (n=100), tocilizumab every-other-week plus a 26-week prednisone taper (n=49) or placebo plus a 26-week (n=50) or 52-week (n=51) prednisone taper in the intention-to-treat population. Responders for this analysis were patients who maintained remission (no GCA signs/symptoms and no erythrocyte sedimentation rate elevation) through week 52. Treatment failure was defined as inability to achieve remission by week 12 or relapse between weeks 12 and 52. Predictors investigated in univariate and multivariable analyses included patient characteristics, disease-related and treatment-related factors and patient-reported outcomes (PROs).

Results

149 patients received tocilizumab plus prednisone (TCZ/PDN) and 101 received placebo plus prednisone (PBO+PDN). After adjustment for confounders, treatment failure was significantly less likely in the TCZ/PDN group than the PBO/PDN group (OR, 0.2; 95% CI, 0.1 to 0.3; p<0.0001). Risk for treatment failure was significantly higher in women than men in the PBO/PDN group (OR, 5.2; 95% CI, 1.6 to 17.2; p=0.007) but not in the TCZ/PDN group. Predictors of treatment failure in the TCZ/PDN group included lower baseline prednisone doses and worse PROs at baseline.

Conclusion

The strongest risk factors for treatment failure in GCA are treatment with prednisone alone and female sex. Lower starting prednisone doses and impaired PROs are associated with failure to respond to tocilizumab.

Trial registration number

NCT01791153.

Long-term effect of tocilizumab in patients with giant cell arteritis: open-label extension phase of the Giant Cell Arteritis Actemra (GiACTA) trial

BACKGROUND

The combination of tocilizumab plus a glucocorticoid taper is effective in maintaining clinical remission without requiring additional glucocorticoid therapy in patients with giant cell arteritis, as shown in part one of the Giant Cell Arteritis Actemra (GiACTA) trial. However, the duration of the tocilizumab effect after discontinuation is unknown. Here, we explored the maintenance of efficacy 1 year after discontinuation of tocilizumab treatment, the effectiveness of retreatment with tocilizumab after relapse, and the long-term glucocorticoid-sparing effect of tocilizumab.

METHODS

In part one of the GiACTA trial, 251 patients were randomly assigned (2:1:1:1) to receive subcutaneous tocilizumab (162 mg) once a week or every other week, combined with a 26-week prednisone taper, or placebo combined with a prednisone taper over a period of either 26 weeks or 52 weeks. Patients in clinical remission stopped masked injections at 1 year (the conclusion of part one). In part two, treatment was at the investigators' discretion and could consist of no treatment, tocilizumab, glucocorticoids, methotrexate, or combinations of these, for two years. Maintenance of efficacy as assessed by clinical remission (defined as absence of relapse determined by the investigator), cumulative glucocorticoid dose, and long-term safety were exploratory objectives in part two of the trial. This trial is registered at ClinicalTrials.gov, NCT01791153.

FINDINGS

215 patients participated in part two of the trial; 81 patients who were randomly assigned to tocilizumab once a week in part one were in clinical remission after 1 year, of whom 59 started part two on no treatment. 25 of these 59 patients (42%) maintained tocilizumab-free and glucocorticoid-free clinical remission throughout part two. Median (95% CI) cumulative glucocorticoid doses over 3 years were 2647 mg (1987-3507) for tocilizumab once a week, 3948 mg (2352-5186) for tocilizumab-every-other-week, 5277 mg (3944-6685) for placebo with a 26-week prednisone taper, and 5323 mg (3900-6951) for placebo with a 52-week prednisone taper (van Elteren p≤0·001, tocilizumab once a week vs placebo groups; p<0·05, tocilizumab-every-other-week vs placebo groups). Tocilizumab-based regimens restored clinical remission among patients who experienced relapse in part two and were treated (median time to remission: 15 days for tocilizumab alone [n=17]; 16 days for tocilizumab plus glucocorticoids [n=36]; and 54 days for glucocorticoids alone [n=27]). No new or unexpected safety findings were reported over the full 3 years of the study.

INTERPRETATION

Giant cell arteritis remains a chronic disease that entails ongoing management and careful vigilance for disease relapse, but continuous indefinite treatment with immunosuppressive drugs is not required for all patients. A substantial proportion of patients treated with tocilizumab for one year maintain drug-free remission during the two years after tocilizumab cessation. For patients who experience relapse, tocilizumab can be used to manage relapses, but it remains prudent to include prednisone for patients who experience relapse because of the risk for vision loss.

FUNDING

F Hoffmann-La Roche.

[Glucocorticoids in the treatment of giant cell arteritis : How much, how long and how to spare?]

Treatment of giant cell arteritis (GCA) with high-dose glucocorticoids (GC) regularly leads to a control of the inflammatory activity, so that high-dose GC is still the recommended standard treatment in the current guidelines; however, after discontinuation of GC treatment or reduction of the GC dosage, relapses occur in up to 70% of patients in the further course of the disease, making it necessary to resume treatment or increase the dosage. As a consequence many patients therefore have to be treated with GC often in high doses over several years, which results in a high cumulative exposure to GC. The risk for GC-associated diseases, such as diabetes, glaucoma, osteoporosis or severe infections is therefore significantly increased for patients with giant cell arteritis. For patients with GC-associated comorbidities or increased risk of developing them or patients with a relapse, the current guidelines therefore recommend GC-sparing treatment with tocilizumab or alternatively methotrexate. It is currently unclear over what period of time patients should be treated with GC and GC-sparing treatment, since high-quality study data on de-escalation strategies for GCA are currently still lacking. Decisions on treatment duration and intensity must therefore be made individually for each patient, taking into account general and patient-specific risk factors for a GC-dependent course, GCA-associated vascular damage (stenoses, aneurysms, visual loss) and treatment-associated complications.

Giant Cell Arteritis and Cardiac Comorbidity

Giant cell arteritis (GCA) is a large vessel vasculitis with a pathogenesis that involves two CD4 T-helper cell lineages, Th1 and Th17. The goal of GCA treatment is to achieve clinical remission and prevent complications, especially vision loss. Despite recent advances in treatment and diagnostic modalities for GCA, there continues to be a gap in the medical literature in addressing treatment and follow-up for patients with GCA after clinical remission is achieved. Of the most important issues to address in this patient population by rheumatologists and primary care physicians alike, is that of cardiovascular disease (CVD) risks in GCA patients associated with the vasculitis and its mainstay of treatment with high-dose glucocorticoids over a prolonged period of time. Physicians must be aware of the CVD events that have been observed in a higher proportion compared to the general population in GCA patients, including strokes, thoracic aortic aneurysms and dissections, myocardial infarctions, and peripheral vascular disease. This review will focus on the risk of CVD in GCA patients, with recommendations for management and follow-up.

Tocilizumab in refractory giant cell arteritis. Monotherapy versus combined therapy with conventional immunosuppressive drugs. Observational multicenter study of 134 patients

OBJECTIVE

To compare the efficacy and safety of TCZ in monotherapy (TCZ_MONO) vs. combined with conventional immunosuppressive drugs (TCZ_COMBO) in Giant Cell Arteritis (GCA) in a clinical practice scenario.

METHODS

Multicenter study of 134 patients with refractory GCA. Patients on TCZ_MONO (n = 82) were compared with those on TCZ_COMBO (n = 52). Drugs were methotrexate (MTX) (n = 48), azathioprine (n = 3), and leflunomide (n = 1). The main outcomes were: prolonged remission (normalization of clinical and laboratory parameters for at least 6 months) and the number of relapses.

RESULTS

Patients on TCZ_COMBO were younger (68.8 ± 8.0 vs 71.2 ± 9.0 years; p = 0.04), with a trend to a longer GCA duration (median [IQR],18.5 [6.25-34.0] vs. 13.0 [7.75-33.5] months; p = 0.333), higher C-reactive protein (CRP) levels (2.1[1-4.7] vs 1.2 [0.2-2.4] mg/dL; p = 0.003), and more prevalence of extra-cranial large-vessel vasculitis (LVV) (57% vs. 34.1%; p = 0.007). In both groups, rapid and sustained improvement was observed. Despite the longer GCA duration, and the higher CRP levels and prevalence of LVV in the TCZ_COMBO, the improvement was similar in both groups at 12 months. Moreover, in the TCZ_COMBO group, prolonged remission was significantly higher at 12-month. Relapses and serious adverse events were similar in both groups.

CONCLUSION

In clinical practice, TCZ in monotherapy or combined with conventional immunosuppressive agents is effective and safe in patients with GCA. Nevertheless, the addition of immunosuppressive drugs, usually MTX, seems to allow a higher rate of prolonged remission, even in patients with a longer GCA duration, more extra-cranial LVV involvement, and higher acute-phase reactants.

Identification of Acute Giant Cell Arteritis in Real-World Data Using Administrative Claims-Based Algorithms

Objective

The objective of this study was to validate claims‐based algorithms for identifying acute giant cell arteritis (GCA) that will help generate real‐world evidence on comparative effectiveness research and epidemiologic studies. Among patients identified by the GCA algorithm, we further investigated whether GCA flares could be detected by using claims data.

Methods

We developed five claims‐based algorithms based on a combination of International Classification of Diseases, Ninth Revision (ICD‐9) diagnosis codes, specialist visits, and dispensed medications using Medicare Parts A, B, and D linked to electronic medical records (2006‐2014). Acute cases of GCA were determined by chart review using the treating physician’s diagnosis of GCA as the gold standard. Among the patients identified with acute GCA, we assessed if a GCA flare occurred during the year after initial diagnosis.

Results

The number of patients identified by each algorithm ranged from 220 to 896. Positive predictive values (PPVs) of the algorithms ranged from 60.7% to 84.8%. Requirement for disease‐specific workups, multiple diagnosis codes, or specialist visits improved the PPVs. The highest PPV (84.8%) was noted in an algorithm that required two or more diagnosis codes of GCA from inpatient, emergency department, or outpatient rheumatology visits plus a prednisone‐equivalent dose greater than or equal to 40 mg/day occurring 14 days before or after the second ICD‐9 diagnosis date, with the cumulative days’ supply greater than or equal to 14 days. Among patients identified as having GCA, 18.2% of patients had definite evidence of a flare and 25% had a potential flare.

Conclusion

A claims‐based algorithm requiring two or more ICD‐9 diagnosis codes from inpatient, emergency department, or outpatient rheumatology visits and high‐dose glucocorticoid dispensing can be a useful tool to identify acute GCA cases in large administrative claims databases.