Predictors of Organ Damage in Systemic Lupus Erythematosus in the Asia Pacific Region: A Systematic Review

OBJECTIVE

Irreversible organ damage is common in patients with systemic lupus erythematosus (SLE). Despite evidence of increased prevalence and severity of SLE in Asia Pacific, organ damage is less well studied in this region. This systematic review aims to identify predictors of organ damage in SLE in the Asia Pacific region.

METHODS

We searched Medline, PubMed, Embase, and Web of Science for observational studies on organ damage in adult patients with SLE in Asia Pacific from August 31, to September 5, 2022. Study selection and data extraction were completed by two independent reviewers using Covidence systematic review software. Risk of bias was assessed using the Newcastle-Ottawa Scale and Joanna Briggs Institute tool. Significant results from univariable and multivariable analyses were synthesized from included studies.

RESULTS

Thirty-eight eligible studies were selected from 1999 to 2022; 22 (58%) of these reported organ damage at study enrollment and 19 (50%) reported damage accrual, as measured by the Systemic Lupus International Collaborating Clinic/American College of Rheumatology Damage Index. Factors predictive of organ damage included older age, glucocorticoid use, longer disease duration, and disease activity. Lupus nephritis was a risk factor for renal and overall damage accrual. Hydroxychloroquine was protective against overall organ damage.

CONCLUSION

Predictors of organ damage in SLE in Asia Pacific are similar to other regions. Although glucocorticoid use is a modifiable risk factor for organ damage, the impact of immunosuppressives and biologic therapies needs further investigation. Effective strategies in early disease are needed to minimize initial organ damage as it predicts subsequent damage accrual.

Cost-effectiveness of cyclophosphamide and non-cyclophosphamide in the induction therapy of Malaysian lupus nephritis patients

BACKGROUND

There is a paradigm shift in the induction therapy for proliferative lupus nephritis (LN). Apart from cyclophosphamide (CYC), mycophenolate mofetil and calcineurin inhibitors have emerged as an alternative option of treatment.

OBJECTIVE

We aimed to compare the cost-effectiveness analysis (CEA) per year, adverse events and renal damage at 24 months between CYC and non-CYC agents (calcineurin inhibitors or mycophenolate) as induction treatment among proliferative lupus nephritis (LN) patients.

METHODS

This was a retrospective and non-controlled study involving biopsy-proven proliferative LN patients (class III or IV with or without V) in the clinic registry from 2017 to 2019. Their medical records were reviewed to determine the date and type of induction, treatment effectiveness, adverse events and renal damage at 24 months. The total cost of treatment included capital cost (building, furniture and equipment) and recurrent cost (emolument, supply/drug, lab investigations, administrative cost and utilities). Treatment effectiveness was defined as renal remission (partial or complete) at 6 months without relapse up to 24 months. The cost-effectiveness analysis (CEA) was expressed as cost per remission per year in Malaysian Ringgit (MYR).

RESULTS

There were a total of 95 inductions with CYC and 27 with non-CYC in 94 LN patients. There was no significant difference in the total mean cost per patient/year between CYC (MYR 18460.26 ± 6500.76) compared to non-CYC (MYR 19302.10 ± 6778.22), p = 0.569. The CEA for CYC was MYR 20,632.06 (GBP 3,538.78) while non-CYC was MYR 20,846.27 (GBP 3,575.52) and mean difference MYR 214.21 (GBP 37.44). There was significantly higher capital cost, consumables, utility, maintenance, administration (p < 0.001) and lab investigations (p = 0.046) in the CYC arm. There was a trend of a higher infection requiring outpatient antibiotic treatment in CYC group (p = 0.05), but similar renal damage outcome with the non-CYC group.Conclusion: For treatment of proliferative LN, there was no significant difference in the CEA and renal damage between CYC and non-CYC induction treatment. There was a trend of a higher rate of infections in the CYC group. Hence, the decision to treat patient with CYC or MMF should be tailored to individual patients, by considering the risk of infection in a particular patient.

Burden of Systemic Lupus Erythematosus on Work Productivity and Daily Living Activity: A Cross-Sectional Study Among Malaysian Multi-Ethnic Cohort

Objectives

This study aims to assess the self-reported work productivity and activity daily living (ADL) impairment among Malaysian patients with systemic lupus erythematosus (SLE) and to examine their associated factors.

Patients and methods

This cross-sectional study included 167 SLE patients (21 males, 146 females; mean age 38.2±9.8 years; range, 20 to 60 years) recruited from the outpatient Rheumatology and Nephrology clinics. Face-to-face interviews were conducted to record patients' socio- demographics (age, sex, ethnicity, marital status, and occupation) and SLE disease characteristics (system involvement, age onset, and presence of organ damage). Disease activity was assessed using the Systemic Lupus Erythematosus Disease Activity Index-2000 (SLEDAI-2K). Short form 36 (SF-36) was used to determine health-related quality of life (HRQoL) while Work Productivity and Activity Impairment (WPAI) questionnaire was used to assess the four domains of absenteeism, presenteeism, overall work productivity, and non-work related ADL impairment. Univariate analyses and multivariable regression analysis examined the association of demographic variables, SLE disease characteristics, and activity with reduced HRQoL and WPAI scores.

Results

The majority of the patients were Malays (59.3%), followed by Chinese (34.7%) and Indian (3.6%) patients. More than two-thirds of the patients reported some degree of impairment in their work productivity and ADL due to the disease. The absenteeism rate was 10.4% in the past one week and their indirect costs were 2,875.17 Malaysian ringgits (US $701.22) in the past seven days. Significant predictors of higher work productivity and ADL impairment scores were higher disease activity, more frequent SLE flares, lupus nephritis, and hematological involvement of SLE. Patients with higher work productivity and ADL impairment scores were also strongly associated with poor QoL. No ethnic disparities of work productivity and ADL impairment were found.

Conclusion

Systemic lupus erythematosus significantly affected the overall productivity in work and non-work related activity in our Malaysian multi-ethnic cohort and both impairments were significantly associated with poor QoL.

Serum uric acid is associated with damage in patients with systemic lupus erythematosus

Introduction

Serum uric acid levels have been reported as predictors of cardiovascular, pulmonary, neurological and renal morbidity in patients with SLE. However, their role in cumulative global damage in these patients has not yet been determined.

Objective

To determine whether serum uric acid levels are associated with new damage in patients with SLE.

Methods

This is a longitudinal study of patients with SLE from the Almenara Lupus Cohort, which began in 2012. At each visit, demographic and clinical characteristics were evaluated, such as activity (Systemic Lupus Erythematosus Disease Activity Index-2K or SLEDAI-2K) and cumulative damage (Systemic Lupus International Collaborating Clinics/American College of Rheumatology Damage Index or SDI). Treatment (glucocorticoids, immunosuppressive drugs and antimalarials) was also recorded. Univariable and multivariable Cox regression models were used to determine the impact of serum uric acid levels on the risk of new damage.

Results

We evaluated 237 patients, with a mean age (SD) at diagnosis of 35.9 (13.1) years; 220 patients (92.8%) were women, and the duration of the disease was 7.3 (6.6) years. The mean SLEDAI-2K and SDI scores were 5.1 (4.2) and 0.9 (1.3), respectively. Serum uric acid level was 4.5 (1.4) mg/dL. Follow-up time was 3.1 (1.3) years, and 112 (47.3%) patients accrued damage during follow-up. In univariable and multivariable analyses, serum uric acid levels were associated with new damage (HR=1.141 (95% CI 1.016 to 1.282), p=0.026; HR=1.189 (95% CI 1.025 to 1.378), p=0.022, respectively).

Conclusion

Higher serum uric acid levels are associated with global damage in patients with SLE.

Work disability in a multi-ethnic Malaysian systemic lupus erythematosus cohort: A cross-sectional study

AIM

To determine the prevalence of work disability (WD) among patients with systemic lupus erythematosus (SLE) and its associated factors.

METHOD

This was a cross-sectional study involving SLE patients aged 18-56 years from Universiti Kebangsaan Malaysia Medical Centre (UKMMC). Employment history was obtained from clinical interviews. WD was defined as unemployment, interruption of employment or premature cessation of employment due to SLE at any time after the diagnosis. SLE disease characteristics, presence of organ damage and Safety of Estrogens in Lupus Erythematosus National Assessment-SLE Disease Activity Index (SLEDAI) flare index were determined from the medical records. Self-reported quality of life (QoL) was performed using the Medical Outcomes Study Short Form-36 (SF-36). Demographic factors, disease characteristics, and QoL were compared between patients with and without WD using statistical analyses.

RESULTS

A total of 215 patients were recruited and the majority were Malay (60.5%), followed by Chinese (33.5%), Indian (4.5%) and others (n = 4, 1.9%). The prevalence of WD was 43.2% (n = 93) with 22.3% (n = 48) patients were unemployed at the time of study. Over half the patients with WD (n = 51, 54.8%) had onset of disability at <5 years from diagnosis. Patients with WD had significantly lower health-related QoL. The independent factors associated with WD were SLEDAI score at diagnosis, frequency of flare, Systemic Lupus International Collaborating Clinics score, being married, had lower education and lupus nephritis.

CONCLUSION

We found a high rate of WD in patients with SLE and it was significantly associated with SLE-related factors, in particular higher disease activity, presence of renal involvement and organ damage.

Immunosuppressive effects of hydroxychloroquine and artemisinin combination therapy via the nuclear factor-κB signaling pathway in lupus nephritis mice

Lupus nephritis (LN) is one of the most common and severe manifestations of systemic lupus erythematosus, leading to permanent renal damage and chronic kidney disease. Hydroxychloroquine (HCQ) serves a protective role against lupus-associated clinical manifestations and medical complications; however, it results in numerous adverse reactions, limiting its long-term use. The aim of the present study was to investigate the combined effect of HCQ and artemisinin (ART) on LN, and to elucidate the underlying mechanisms. An in vivo LN mouse model was prepared, and the animals were administered prednisone (PDS; serving as a positive control), high-dose HCQ (H-HCQ) or low-dose HCQ combined with ART (L-HCQ + ART) once daily for 8 weeks. The body weight, serum biochemical parameters, immune and inflammatory indicators, renal and spleen histological alterations, and mRNA expression levels of Kruppel-like factor 15 (KLF15) and nuclear factor-κB (NF-κB) were analyzed. It was observed that L-HCQ + ART and H-HCQ ameliorated the LN-induced body weight decrease, and significantly decreased the levels of anti-double stranded DNA, antinuclear antibodies, immunoglobulin G, interferon γ, tumor necrosis factor-α and transforming growth factor-β1, as well as improved the kidney and spleen pathology, when compared with the model group. In addition, L-HCQ + ART and H-HCQ treatments induced KLF15 upregulation and NF-κB downregulation. These results indicated that treatment with L-HCQ + ART exerted renoprotective effects by regulating the expression levels of cytokines, KLF15 and NF-κB. This combination treatment may have a similar immunosuppressive effect as PDS and H-HCQ, and may be a promising alternative for LN treatment.

Damage in the Multiethnic Malaysian Systemic Lupus Erythematosus (SLE) Cohort: Comparison with Other Cohorts Worldwide

Systemic Lupus Erythematosus (SLE) is a chronic autoimmune disease and despite the improvement in the survival in the past few decades, the morbidity due to disease damage remains significant. The objectives of this study were to investigate the disease damagepattern and determine the associated factors of damage in the multi-ethnic Malaysian SLE patients. We consecutively 424SLE patients who attended a consistent follow-up at the National University of Malaysia Medical Centre and Putrajaya Hospital were recruited. Disease damage was assessed using the SLICC/ACR (Systemic Lupus International Collaborating Clinics/American College of Rheumatology) Damage Index (SDI) scores. Information on their demographics and disease characteristics were obtained from the clinical record. Univariate analysis was performed and the best model of independent predictors of disease damage was determined by multivariate logistic regression analysis. A total of 182 patients (42.9%) had disease damage (SDI ≥1). A significantly higher number of Indian patients had disease/organ damage and they predominantly developed steroid-induced diabetes mellitus (SDM). Patients with corticosteroid-induced osteoporosis (CIOP) were more likely to be Malayswhile majority of patients who developed malignancy were Chinese (p<0.05). In the univariate and multivariate analyses, disease damage was significantly associated with age, Indian ethnicity, lower mean cumulative C3 level, neuropsychiatry lupus (NPSLE), and antiphospholipid syndrome (APLS). Patients who had ever and early treatment with hydroxychloroquine(HCQ)were less likely to develop disease damage while more patients who had received oral prednisolone ≥1mg/kg daily over 2 weeks had disease damage (p<0.05). In conclusion, there were inter-ethnic differences in the damage pattern and risks among SLE patients.

Childhood onset systemic lupus erythematosus: how is it different from adult SLE?

About 20% of systemic lupus erythematosus (SLE) starts in childhood and children have less gender bias in favor of females as compared to adults. Systemic manifestations, nephritis, neuro-psychiatric disease and cytopenias are more common in children at presentation than adults. Since most children develop lupus in their early adolescence, dealing with the diagnosis of an unpredictable lifelong disease during this phase of life is challenging. Physicians must recognise specific medical and social needs of this age group, for optimal long-term outcome. Steroids and immunosuppressive drugs are the cornerstone for treatment in children as with adults with lupus. The outcome has improved considerably with these drugs and 10-year survival is nearly 90%. Due to longer life spans more damage accrues in children as compared to adults. Most of the drugs are associated with significant toxicity and the goal of having a drug which reduces disease activity and damage without hampering normal growth, development and fertility is still an elusive one. The current review focuses on clinical and immunological aspects of childhood SLE and how it differs from adulthood SLE.