Comparison of treatments and outcomes of children with juvenile dermatomyositis followed at two European tertiary care referral centers

Achieving Medication-Free Remission in Patients With Juvenile Dermatomyositis

OBJECTIVE

Prognostic factors associated with medication discontinuation in children with juvenile dermatomyositis (JDM) remain largely elusive. We aim to identify the predictors of medication-free remission (MFR) in children with JDM.

METHODS

In this retrospective study, patients diagnosed with JDM according to Peter & Bohan criteria and followed for ≥18 months at a tertiary care center from 2006 through 2022 were included. Data extracted included demographics, physical examination, laboratory results, and medications. MFR was defined as inactive JDM after discontinuation of all systemic immunosuppressives for ≥6 months, in line with international consensus guidelines for trials of therapies in idiopathic inflammatory myopathies. A two-sided P < 0.05 was considered statistically significant.

RESULTS

Of 55 patients with JDM (63.6% female, age median [interquartile range (IQR)] 6 [3.5-12] years), 29 (52.7%) achieved MFR after a median (IQR) of 33 (22.5-55.2) months. MFR was more common in those who were younger at JDM diagnosis (median 5 vs 8 years, P = 0.008), had early resolution of disease activity (median 11 vs 18 months, P < 0.001), and presented with Gottron papules (χ2 = 5.25; P = 0.022) and elevated lactate dehydrogenase (χ2 = 4.82, P = 0.028). Diagnosis of JDM before 5 years old (odds ratio 4.5, 95% confidence interval [CI] 1.2-16.7) was the only predictor of MFR in our multivariate model (area under the curve 0.65, 95% CI 0.53-0.76).

CONCLUSION

Half of our patients with JDM achieved MFR. Age at JDM diagnosis may be an important predictor of achieving MFR.

Immunobiologics in juvenile dermatomyositis: a systematic review of promising therapeutic advances

Introduction

To identify the most effective treatment for juvenile dermatomyositis (JDM), considering efficacy, safety, impact on patients and improvement in their quality of life.

Material and methods

A systematic review was carried out comparing known treatments and immunobiological therapies, evaluating clinical improvement, adverse events and prognosis. The MEDLINE, PubMed, LILACS and Cochrane Library databases were used with children aged 0 to 18 diagnosed with JDM. The PRISMA 2020 statement was followed throughout the process.

Results

The immunobiologics studied were rituximab (RTX) and anti-tumor necrosis factor drugs and used the Disease Activity Score to skin, Childhood Myositis Assessment Scale and Manual Muscle Testing tools. There was no difference in the response when RTX was used (early or late). The anti-TNF studies were carried out in a population that was refractory to the initial treatment and showed a significant improvement in muscle and skin disease activity.

Conclusions

For severe or refractory disease, biologics tend to be the medication with the best therapeutic response.

Factors Associated With Complete Clinical Response and Remission in a Cohort of Romanian Children With Juvenile Dermatomyositis

OBJECTIVES

To describe a Romanian cohort of patients with juvenile dermatomyositis (JDM) and to identify factors associated with disease severity, complete clinical response, and sustained remission.

METHODS

We retrospectively reviewed data from 30 JDM patients from 2013 to 2022. The inactive disease state was defined as no active skin rash, muscle weakness, or elevated muscle enzymes. A complete clinical response implied a status of inactive disease maintained for six consecutive months while on medication and remission of inactive disease for at least six consecutive months after treatment. Association factors and predictors of time to complete clinical response and time to remission emerged from bivariate correlation (Pearson's coefficient) and univariate survival analysis (Kaplan-Meier analysis).

RESULTS

The median times to complete clinical response and time to remission for the entire cohort were 30.5 months (2.5 years) and 48.5 months (4.04 years), respectively. Nine patients (30%) had a severe disease course, while twenty-one patients (70%) had a mild/moderate course. The presence of calcinosis, time to corticosteroid discontinuation, history of treatment escalation in the first 18 months, and treatment with azathioprine or biologic DMARDs were strongly associated with a longer time to clinical remission (Pearson's > 0.5, p < 0.05). Seven patients (23%) achieved remission, and none of them relapsed during the subsequent median follow-up of 19 months.

[Advances in the diagnostics and treatment of juvenile dermatomyositis]

Juvenile dermatomyositis (JDM) is by far the most frequent inflammatory myopathy in childhood and adolescence. It is clinically characterized by inflammatory changes of the skin and muscles but as a multisystemic disease can also affect the skeletal system, the gastrointestinal tract, lungs and heart. Intrinsic (multigenetic risk) and extrinsic factors (triggers) are involved in the pathogenesis resulting in endothelial damage, involvement of fascies, activation of the interferon system and autoimmune reactions including formation of myositis-specific autoantibodies (MSA). In contrast to dermatomyositis in adults, in children and adolescents there are no associations with malignant diseases. The variable expression, the rarity of the disease and the risk of long-term damage and complications necessitate pediatric rheumatological experience in the diagnostics and treatment. Recently, new approaches in drug treatment have substantially improved the outcome and prognosis but a multidisciplinary treatment (including physicians, physiotherapists, psychologists, social workers) is mandatory, especially in the first phases of the disease. Particularly important is a professionally correct treatment of the functional sequelae, which are a particular focus of this article.

Biologic drugs in the treatment of juvenile dermatomyositis: a literature review

There is no clear consensus in the literature regarding the choice of biologic therapies and efficacy in juvenile dermatomyositis (JDM). In this review, we aimed to examine previous studies regarding biologic drug use in JDM patients. We screened MEDLINE and Scopus for articles involving JDM patients treated with biologic drugs. We identified 74 articles describing 495 JDM patients treated with biologic drugs (538 biologic treatments) during our literature search. The median (min-max) age of these patients was 9.8 (1-17) years (F/M:1.8). The most frequently used biologic drugs were rituximab (RTX, 50%) and tumor necrosis factor (TNF) inhibitors (34.8%). In a few cases, abatacept (4.3%), anti-interleukin-1 agents (0.9%), tocilizumab (0.9%), bortezomib (0.4%), ustekinumab (0.2%), eculizumab (0.2%), and golimumab (0.2%) were used. RTX was most frequently preferred in patients with severe skin involvement (46.3%). Improvement with RTX was obtained in 60.1% of RTX treatments. Infliximab was most frequently preferred in calcinosis (43.3%), while adalimumab in skin involvement (50%) and etanercept in resistant/recurrent diseases (80%). Improvement was achieved in 44.4% of anti-TNF treatments. Adverse events were observed in 46.8% (58/124) of all treatments. Our results suggest that biologic agents may be a promising alternative for the treatment of particularly resistant JDM cases. Controlled studies are required to provide higher level of evidence for the timing of biologic use in JDM treatment. Key Points • There is no consensus on the choice and efficacy of biologic therapies in JDM. • RTX and TNF inhibitors are the most commonly used biologic drugs. • Biologics were especially preferred in severe skin involvement, calcinosis, and resistant diseases.

Efficacy and tolerance of corticosteroids and methotrexate in patients with juvenile dermatomyositis: a retrospective cohort study

OBJECTIVES

To assess the efficacy and tolerance of the conventional first-line treatment by methotrexate (MTX) and corticosteroids (CS) in patients with juvenile dermatomyositis (JDM) regardless of severity.

METHODS

We conducted a monocentric retrospective study of patients with newly-diagnosed JDM treated with MTX and CS from 2012 to 2020. Proportion of clinically inactive disease (CID) within six months of MTX initiation was evaluated using both PRINTO criteria (evaluating muscle inactive disease) and Disease Activity Score (evaluating skin inactive disease). We compared responders and non-responders using univariate analyses.

RESULTS

Forty-five patients with JDM, out of which thirty (67%) severe JDM, were included. After six months of treatment with MTX and CS, complete CID, muscle CID and skin CID were achieved in 14/45 (31%), 19/45 (42%) and 15/45 (33%) patients respectively. The absence of myositis-specific (MSA) or myositis-associated autoantibodies (MAA) at diagnosis was associated with a better overall, cutaneous and muscular therapeutic response, compared with antibody-positive forms (p< 0.01). Requirement for ICU (p= 0.029) and cutaneous ulcerations (p= 0.018) were associated to a less favorable muscle response. MTX was stopped due to intolerance in six patients (13%) before month 6.

CONCLUSION

Conventional first-line treatment with MTX was not efficient in a large subset of JDM patients, especially in patients with MSA-positive forms, and in patients with severe JDM. Larger multicentre cohorts are required to confirm these data and to identify new predictive biomarkers of MTX response, in order to treat patients with JDM as early as possible with appropriate targeted drugs.

Respiratory symptoms as initial manifestations of interstitial lung disease in clinically amyopathic juvenile dermatomyositis: a case report with literature review

Background

Clinically amyopathic juvenile dermatomyositis (CAJDM) is a clinical subgroup of juvenile dermatomyositis (JDM), characterized by JDM rashes with little or no clinically evident muscle weakness. Interstitial lung disease (ILD) is an uncommon but potentially fatal complication of juvenile dermatomyositis (JDM). While adults with dermatomyositis-associated ILD usually present respiratory symptoms before or at the same time as skin muscle manifestations, only a few studies have covered the onset of respiratory symptoms of ILD in JDM patients, especially CAJDM. There is currently no clear effective treatment regime or any prognostic factors for CAJDM-associated ILD.

Case presentation

Here, we report the first case of a CAJDM patient who presented with respiratory symptoms as the initial manifestation. A 10-year-old male patient presented to the hospital with a complaint of progressive cough and chest pain. Violaceous macule and papules appeared a few days later and he was positive for anti-Ro-52 antibodies. Imaging showed diffuse interstitial infiltration in both lungs and lung function tests showed restrictive and obstructive ventilatory dysfunction. Muscular abnormalities were excluded by thigh magnetic resonance imaging (MRI) and electromyography. Skin biopsy showed pathognomonic findings consistent with DM. Lung biopsy indicated chronic inflammation of the mucosa. This patient was finally diagnosed with CAJDM complicated by ILD and prescribed methylprednisolone, immunoglobulin, prednisolone and mycophenolate mofetil (MMF) for treatment. The patient’s cutaneous and respiratory manifestations were largely improved. We retrospectively reviewed this and another six cases with CAJDM-associated ILD reported previously to better understand its clinical characteristics and effective management.

Conclusions

Initial respiratory symptoms with rapid progression in patients presenting Gottron papules should be considered manifestations of CAJDM-associated ILD. We also found a combination of corticosteroids, IVIG and MMF to be an effective method of arresting the progress of CAJDM-associated ILD and improving the prognosis of the patients.

Is Anti-NXP2 Autoantibody a Risk Factor for Calcinosis and Poor Outcome in Juvenile Dermatomyositis Patients? Case Series

Juvenile dermatomyositis (JDM) has a wide spectrum of clinical presentations. In the last decade, several myositis-specific antibodies have been identified in patients with JDM and connected with specific organ involvement or specific clinical picture. It has been published that the presence of anti-NXP2 autoantibodies presents a risk for calcinosis in patients with JDM. We aimed to investigate the prevalence of calcinosis and response to the treatment in JDM patients with anti-NXP2. In a retrospective, multinational, multicenter study, data on 26 JDM (19 F, 7 M) patients with positive anti-NXP2 were collected. The mean age at disease presentation was 6.5 years (SD 3.7), the median diagnosis delay was 4 months (range 0.5-27 months). Patients were divided into two groups (A and B) based on the presence of calcinosis, which occurred in 42% of anti-NXP2 positive JDM patients (group A). Four patients already had calcinosis at presentation, one developed calcinosis after 4 months, and 6 developed calcinosis later in the disease course (median 2 years, range 0.8-7.8). The differences in laboratory results were not statistically significant between the groups. The mean age at disease presentation (5.2/7.5 years) trended toward being younger in group A. Children with calcinosis were treated with several combinations of drugs. In four cases, rituximab and, in one case, anti-TNF alpha agents were used successfully. Disease outcome (by evaluation of the treating physician) was excellent in four, good in two, stable in two, and poor in three patients. None of the patients from group B had a poor disease outcome. In conclusion, JDM patients with anti-NXP2 are prone to develop calcinosis, especially if they present with the disease early, before 5 years of age. The development of calcinosis is associated with worse disease outcomes. The combination of several immunomodulatory drugs and biologic drugs can stop calcinosis progression; however, there are no evidence-based therapies for treating calcinosis in JDM patients.