Abstract
The rates of relapses and therapy discontinuation in patients with giant cell arteritis (GCA) in the modern therapeutic era have not been defined. We aimed to evaluate the glucocorticoid (GC) discontinuation rate and the factors associated with relapses in a contemporary GCA cohort. Patient and treatment data were collected cross-sectionally at first evaluation and 2 years later (second evaluation), in a multicenter, prospective GCA cohort. Predictors of relapses were identified by logistic regression analyses. 243 patients with GCA were initially included (67% women, mean age at diagnosis: 72.1 years, median disease duration: 2 years) while 2 years later complete data for 160 patients were available and analyzed. All patients had received GCs at diagnosis (mean daily prednisolone dose: 40 mg) while during follow-up, 37% received non-biologic and 16% biologic agents, respectively. At second evaluation, 72% of patients were still on therapy (GCs: 58% and/or GC-sparing agents: 29%). Relapses occurred in 27% of patients during follow-up; by multivariable logistic regression analysis, large vessel involvement at diagnosis [odds ratio (OR) = 4.22], a cardiovascular event during follow-up (OR = 4.60) and a higher initial GC daily dose (OR = 1.04), were associated with these relapses. In this large, real-life, contemporary GCA cohort, the rates of GC discontinuation and relapses were 40% and 27%, respectively. Large vessel involvement, a higher GC dose at diagnosis and new cardiovascular events during follow-up were associated with relapses.
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Introduction
Giant cell arteritis (GCA) is the most common systemic vasculitis in adults affecting large arteries, especially the aorta and its branches [1]. It is a heterogenous disease, often not conforming to a single clinical presentation [2]. Ischemic complications of the arteries supplying the optic nerves result in vision loss in 15–20% of cases requiring urgent treatment [3, 4]. Glucocorticoids (GCs) remain the mainstay of treatment for GCA and should be initiated promptly to all patients [5]. While symptoms respond to therapy, relapses are common and long-term therapy with GCs is often needed, resulting in significant morbidity and mortality [6].
Large epidemiological and retrospective studies have shown that 40–79% of patients will relapse at least once during the disease course, while 40% will not be able to discontinue GCs due to multiple relapses [6, 7]. Relapses are more frequent during the first 2 years of treatment when prednisone dose is reduced to 5–10 mg/day [6].
Over the last few decades, non-biologic (mainly methotrexate-MTX) and biologic (anti-interleukin-6, IL-6 such as tocilizumab-TCZ) therapies have been used in clinical practice to minimize GC use and their side effects while close monitoring and treatment of various comorbidities in these patients is implemented [8, 9]. The effects of these interventions in the rates of GC discontinuation and disease relapses have not been thoroughly examined.
The aim of our study was to evaluate the rate of GC discontinuation and the predictive factors for relapses in a contemporary cohort of patients with GCA.
Material and methods
Patients
This was a multicenter, prospective cohort study of patients with GCA held by the GCA study group of the Greek Rheumatology Society (ERE-EPERE) [10]. Participating centers included academic and non-academic referral rheumatology clinics, National Health System outpatient clinics and private offices. Ethical approval was provided by the local institutional boards of participating centers and informed consent was obtained from participating patients.
Between December 2015 and December 2019, GCA patients were cross-sectionally evaluated (1st evaluation) in each center, outpatient clinic or private office. The diagnosis of GCA was based on the 1990 American College of Rheumatology (ACR) classification criteria [11]. Patients were excluded if they were not routinely followed up by their physician or had less than 2 visits between the 1st and 2nd evaluation. For each patient, data regarding patient (age, gender, weight, height, working status, educational status, smoking, and alcohol habits) and disease (disease duration and presenting symptoms, laboratory, imaging of temporal and large vessels and temporal artery biopsy data) characteristics as well as treatment patterns (GC dose, use of non-biologic and biologic therapies, treatment adverse events) were recorded and analyzed. Data regarding the mode of diagnosis (temporal artery biopsy, ultrasound of the temporal arteries, large vessel imaging) were collected retrospectively. These were performed at each center’s according to the caring physician discretion.
Comorbidities, including hyperlipidemia, coronary artery disease, cerebrovascular disease, peripheral vascular disease, diabetes mellitus, chronic obstructive pulmonary disease (COPD), arterial hypertension, depression, osteoporosis, current or past hepatitis B virus (HBV) infection, current or past hepatitis C virus (HCV) infection, history of tuberculosis (TB) or latent TB infection (LTBI), history of herpes zoster (HZ), neoplastic diseases and history of vaccination against influenza and pneumococcus were also documented. The diagnosis of each comorbidity was made based on the use of prescribed treatment for its management.
Patients were followed by their physicians and the same data were collected approximately 24 months (2 years) later at the 2nd evaluation. The number and type of relapses during this follow-up period were recorded. Relapse was defined as reappearance of disease related symptoms, usually accompanied by elevation of acute-phase reactants or evidence of vasculitis in imaging studies (MRI, PET/CT, CTA) that required treatment adjustment.
Statistical analysis
All analyses were performed with the use of Microsoft Excel 2013 and IBM SPSS Statistics v.20 software. At firsts, data were analyzed by descriptive statistics. Continuous variables were presented by mean and standard deviation if normally distributed and median and interquartile range if otherwise. Categorical variables were presented by counts and percentages. Multivariable logistic regression analysis was used to determine factors associated with GC discontinuation. Age, sex, disease duration, initial GC dose, treatment with biologic or non-biologic agents, and the occurrence of GC related adverse events, disease relapses and new cardiovascular disease (CVD) events during follow-up were used as independent variables. Multivariable logistic regression analysis was additionally used to determine possible predictors of new relapses. Age, sex, disease duration, treatment status, specific treatment with biologic or non-biologic agents, large vessel vasculitis at diagnosis, erythrocyte sedimentation rate at diagnosis and the occurrence of new CVDs during follow-up were used as independent variables. The selection method in the regression analyses was based on the results of initial univariate regression analyses following the Collett’s model selection approach. Clinically significant variables were finally inserted in the model. The final model included: age, sex, duration of disease, treatment, prednisolone dose, treatment with GC-sparing agents, treatment with biologics, large vessel vasculitis at diagnosis, erythrocyte sedimentation rate at diagnosis, cardiovascular events during follow-up. Collinearity was excluded using the Variance Inflation Factor measure.
Results
Patient and disease characteristics at baseline
Initially, 243 GCA patients were included in the study. 67% were women with a mean age at diagnosis of 72 years (Table 1) and a median disease duration of 2 years at the 1st evaluation. Temporal artery biopsy had been performed in 196 patients (81% of the whole cohort) and was positive in 161 of them (82%). 103 patients (43%) underwent temporal artery ultrasound that was positive in half of them (51%). Furthermore, large vessel involvement indicated by positive imaging studies (MRA, PET/CT, CTA) was found in 7% of the patients.
The most common symptoms at diagnosis are shown in Table 1. Visual disturbances were present in 21% of patients. The median erythrocyte sedimentation rate (ESR) and C-reactive protein (CRP) at diagnosis were 102 mm/h (IQR 36) and 65.8 mg/L (IQR 92) respectively (Table 1). Regarding co-morbidities, a history of coronary artery disease, stroke and peripheral artery disease was reported, based on history and/or therapy, in 8%, 4% and 6% of patients, respectively. Moreover, arterial hypertension was reported in 58%, hyperlipidemia in 33% and diabetes mellitus in 18% of patients while current neoplastic diseases, depression, osteoporosis (defined by anti-osteoporotic therapy and/or history of osteoporotic fractures) and COPD were reported in 2%, 11%, 47% and 7% respectively. Regarding vaccination, 85 (33.5%) patients had anti-pneumococcal vaccination and 158 (63%) had been vaccinated for influenza. Four patients (2%) had active HBV infection (HBsAg positive) at the time of diagnosis, while no patient with HCV infection was reported. Finally, LTBI was identified in 8 patients (Mantoux test positive).
Treatment patterns
All patients were treated with GCs at diagnosis. Seventeen patients (6.7%) with visual disturbances received intravenous pulses of methylprednisolone (1000 mg/day for 3 days). The initial median prednisolone dose was 40 mg/day. Only 8 patients (3%) were also treated with MTX and none with biologics at diagnosis. At the 2nd evaluation 66 patients were receiving GCs as monotherapy and 26 patients were receiving GCs in combination with non-biologics/biologics (Table 2).
In Fig. 1, the flowchart of patients is shown. At the 2nd evaluation, complete data were available for 160 patients (66%) with a median interval between the 1st and 2nd evaluation of 2.02 years (Fig. 1). Eighteen patients were excluded as the median time of the 2nd evaluation was less (< 1 year) or exceeded (> 3 years) the suggested reevaluation time point (2 years after the 1st evaluation) while 39 patients were lost to follow-up. No differences were observed between patients who were lost to follow-up and those who were analyzed after 2 years regarding patient characteristics (p = 0.89 for sex, p = 0.92 for age), disease characteristics (p = 0.18 for LVV involvement, p = 0.18 for ESR and p = 0.50 for disease duration) and treatment patterns (p = 0.92 for non-biologics, p = 0.84 for biologics and p = 0.44 for glucocorticoids).
Regarding treatment with non-biologics, 20% (49/243) were receiving MTX at 1st evaluation and a similar percentage 2 years later (16%, 26/160, Table 2) while for biologics 7.5% were receiving them at 1st evaluation and 13% 2 years later, respectively. Among patients who had received biologics, 18 were on TCZ, 2 on abatacept and 1 on infliximab (Table 2).
Rates and factors associated with GC discontinuation
At the end of the follow-up (median time since diagnosis: 4.3 years), 58% were still on GCs (median dose: 5 mg/day) while 28.7% were on a GC-sparing agent (biologic or non-biologic). No factors were identified by multivariable logistic regression analysis to be associated with GC discontinuation. There was a marginally non-statistically significant negative association between age and GC discontinuation [odds ratio 0.958 (0.916, 1.003) per 1-year increase, p = 0.065).
Rates and predictors of relapses
During the prospective 2-year follow-up period, 43 patients (27%) suffered ≥ 1 relapse (relapse rate: 17/100 patient-years). The median time from the 1st evaluation to the 1st relapse was 8 months. These were mainly clinical relapses (75.5% in 47.2% accompanied by increases in ESR and/or CRP) while in 22.6% the relapse was assumed by laboratory findings while in 1 patient (1.9%) the diagnosis was made by suggestive large vessel imaging findings. Relapses were managed by increasing the dose of GCs (n = 33.61%) or adding a GC-sparing agent (MTX, n = 4 or TCZ, n = 5).
Patients who relapsed (n = 43) compared to those who did not relapse (n = 117) had shorter disease duration (median 1.4 vs. 3 years at 1st evaluation, p = 0.015), more frequent large vessel involvement (21% vs. 8%, p = 0.019), had received a higher GC dose at diagnosis (mean daily prednisolone dose: 46.2 vs. 39.9 mg, p = 0.01) and were more likely to have developed a CVD during the 2-year follow-up period (14% vs. 4.2%, p = 0.032, Table 3).
By multivariable logistic regression analysis, large vessel involvement [odds ratio (OR) (95% confidence intervals) = 4.22 (1.14, 15.58), p = 0.03], a new CVD event [OR = 4.60 (1.11, 19.13), p = 0.04] and a higher GC dose at diagnosis [OR = 1.04 (1.002, 1.08), p = 0.04] were associated with increased odds for a relapse (Table 4).
Serious events
During the 2-year follow-up period, 43 GC-related adverse events were recorded. The most common was osteoporosis occurring in 20 patients (12.5%) while 11 patients (6.9%) had 12 documented fractures. Other GC-related side effects included cataract (n = 9, 5.6%) and diabetes mellitus (n = 3, 1.9%). Hospitalizations were mainly due to CVD events (n = 11, 6.9% such as myocardial infarction/n = 2, rupture of aortic aneurysm/n = 2 and heart failure/ n = 2) and serious infections (n = 9, 5.6%). Herpes zoster was reported in 3.1% of patients and malignancies in 4.4% (lung cancer, n = 2 and non-melanoma skin cancer, n = 2).
During follow-up, 10 patients died (6.2%). The exact cause of death was available for eight patients, and it was due to cardiovascular events (n = 3, 30%), infections (n = 2, 20%) or other causes (n = 3, 30%).
Discussion
This is one of the few real-life studies examining the relapse and drug discontinuation rates in patients with GCA in the contemporary treatment era. Our findings indicate that there was a trend for a lower relapse and a similar GC discontinuation rate compared to older GCA cohorts. Factors associated with relapses included large vessel involvement, initial GC dose and CVD events during follow-up.
GCA has been traditionally treated with GCs while non-biologic (mainly MTX) and biologic (anti-IL6, TCZ) agents are usually employed for refractory or relapsing disease. Recent Guidelines and Recommendations propose their use in combination with GCs at diagnosis either for patients who are at risk for GC-related side effects or complications (EULAR) or for all patients (ACR). In both cases, TCZ is the preferred GC-sparing agent compared to MTX. For patients who had not received TCZ at diagnosis, EULAR recommends them for relapsing or refractory to GC disease. Real-life data though regarding the course of patients (relapses, GC-discontinuation rate) with GCA with the addition of these agents are limited.
In our study, 37% of patients received non-biologic and 16% biologic agents during their disease course. During the entire 4-year follow-up period, 42% of patients were able to discontinue GCs compared to 24–55% in older GCA cohorts [7, 12, 13]. While in older studies a number of factors were associated with a higher GC-discontinuation rate such as a higher initial oral prednisone dose [7], a higher hemoglobin level [14], the use of GC-sparing agents and male sex [15], in our study no baseline or on therapy factors were associated with GC discontinuation. There was only a non-statistically significant trend for younger patients to achieve GC discontinuation.
Long-term GC treatment is associated with the development of several well-recognized adverse events [5, 16, 17]. In our study, 22% developed GC-related adverse events including cataract and osteoporosis over a 2-year period. This rate is rather lower compared to the 46% rate reported by Labarca et al. during the same follow-up period and similar to that observed by Proven et al. (86% during 10 years of follow-up) [7, 18].
It is currently unknown whether the gradual introduction of non-biologic and biologic agents in the treatment of GCA has resulted in a decreased relapse rate. In our study, relapses occurred in 27% of patients during the 2-year prospective follow-up period (17/100 patient-years). Although direct comparisons cannot be made, it seems that this relapse rate is lower compared to what has been reported in previous GCA cohorts [6, 7, 12, 14, 15, 18,19,20,21,22]. Several studies report that the first 2 years after diagnosis 35% of patients relapse [14, 21] while a higher percentage is observed (40–52%) during the 1st year after diagnosis when GCs are tapered [12, 19, 22]. In a cohort of patients with a total follow-up of approximately 5 years after diagnosis, Labarca et al. observed that 79% of patients experienced ≥ 1 relapse [7].
Numerous patient and/or disease characteristics have been associated with GCA relapses. These included clinical characteristics such as jaw claudication, scalp tenderness, polymyalgia rheumatica symptoms [6, 15] or fever ≥ 38 °C [14], the severity of inflammatory infiltrate in temporal artery biopsy [14], female sex [7, 15], specific comorbidities like diabetes mellitus, hypertension and anemia [7, 19] and a strong initial inflammatory response (defined by the presence of fever, weight loss, ESR > 85 mm/h and hemoglobin < 110 gm/L) [23, 24]. It is obvious from these studies that a consistent phenotype associated with relapses has not been defined.
In our study, large vessel involvement was associated with an almost a fourfold higher risk for disease relapses. This is in accordance with the findings from other recent studies [21, 22, 25, 26], indicating that it should be explored further whether all patients with GCA should be screened for large vessel involvement at diagnosis and receive a more aggressive treatment scheme to prevent relapses and decrease the rate of thoracic aneurysm formation, as is the case with another large vessel arteritis (Takayasu arteritis) [8, 9].
A novel finding of our study was that patients who had a new CVD event during follow-up had a higher relapse risk. In general, patients with GCA are at higher risk for CVD events due to their advanced age and cardiovascular risk factors at diagnosis as well as to disease-related factors [22, 27, 28]. In our cohort, the mean age of patients at diagnosis was 72 years while a substantial number had traditional CVD risk factors (58.3% hypertension, 33% hyperlipidemia, 18% diabetes mellitus). It is unclear if this higher relapse rate could be related to a less aggressive use of GCs in patients with new CVD events during follow-up or to other unknown factors. Nevertheless, this is a finding that needs to be replicated in larger patient cohorts.
Another interesting finding was that there was a dose-dependent increase in the relapse rate according to the initial GC dose (OR = 1.04). Previous studies by Restuccia et al. [14] and Martinez-Lado et al. [19] as well as a recent metanalysis [20] have not shown such an association. A possible explanation could be that patients with more severe presentation (i.e., vision involvement, higher inflammatory response) may require higher initial GC doses and are more prone to relapses. This hypothesis is supported by the findings from a study of Hernandez-Rodriguez et al. in which patients with a strong inflammatory response (fever, weight loss, ESR > 85 mm/h and hemoglobulin < 110 gm/L) had higher GC requirements but also more disease flares [23].
Limitations and strengths
Major strengths of our study include its real-life multi-center design, the large number of included patients, the utilization of invasive and non-invasive modes of GCA diagnosis, its 2-year prospective follow-up period and the inclusion of several referral centers with significant experience in patients with GCA. On the other hand, our study has certain limitations. As is the case with similar multi-center, real-life patient cohorts, a significant number of patients (34% from the initial cohort) were lost in follow-up while there was no universally employed protocol for the diagnosis, monitoring, and management of these patients among different centers.
Conclusion
Our contemporary, real-life cohort study demonstrates that after the gradual introduction of GC-sparing agents in GCA management, there was a trend for a lower relapse rate compared to older cohorts. Large vessel involvement and new CVD events were associated with relapses indicating the need for replicating these findings in larger patient cohorts that could lead to a different diagnostic and treatment approach in this patient population. Furthermore, we noted that the GC discontinuation rate has not been altered significantly, since ~ 60% of patients remained on them 4 years after diagnosis. These findings emphasize the need for more real-life studies evaluating the earlier use of non-GC therapies as well as for the testing and introduction of novel GC-sparing agents in GCA treatment.
Data availablility
Data are available from the corresponding author upon reasonable request.
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Acknowledgements
The study was funded in part by the Greek Rheumatology Society and Professional Association of Rheumatologists (ERE-EPERE) and by the Special Account for Research Grants (S.A.R.G.), National and Kapodistrian University of Athens, Athens, Greece (DV, Grants #12085, 12086).
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Ethical approval was provided by the local institutional review boards (IRBs) of participating centers and informed consent was obtained from participating patients.
IRB approval was provided by the co-ordinating central center General Hospital of Athens “Hippokration” (reference number: 64/16-Apr-2015) and by the local IRBs of the following participating centres: IRB of “General Hospital Sismanogleio” (reference number: 50/20-Dec-2019), IRB of “General Hospital NIMTS” (reference number: 157/03-Oct-2019), IRB of “Laiko” General Hospital (reference number: 1194/23-Oct-2019), IRB of “General Hospital Gennimatas” (reference number: 30877/30-Oct-2019), IRB of University Hospital of Ioannina, (reference number: 6/24-Mar-2015), IRB of University Hospital of Alexandroupolis (reference number: 11/27-Dec-2019), IRB of “Thriasio General Hospital” (reference number: 340/07-Oct-2019), IRB of "General Hospital of Thessaloniki, EuroMedica” (private practice, reference number: 80/10-Oct-2019), IRB of Attikon Univesrity Hospital (reference number: 103/6-MAR-2014). For the remaining centres, the co-ordinating centers’ IRB approval was deemed sufficient.
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Tsalapaki, C., Lazarini, A., Argyriou, E. et al. Glucocorticoid discontinuation rate and risk factors for relapses in a contemporary cohort of patients with giant cell arteritis. Rheumatol Int 44, 603–610 (2024). https://doi.org/10.1007/s00296-023-05527-8
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DOI: https://doi.org/10.1007/s00296-023-05527-8