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Disease characteristics and clinical outcomes of adults and children with anti-MDA-5 antibody-associated myositis: a prospective observational bicentric study

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Abstract

To study the demographic, clinical and serologic characteristics of anti-MDA5-positive DM from two geographically and ethnically disparate inception cohorts in India. To identify the clinical and serological parameters at inception that could predict mortality among these individuals. Individuals with anti-MDA5 antibody-positive DM diagnosed between 2017 and 2020 from two centres in India were prospectively followed up. The clinical and serological characteristics at baseline and the treatment outcome at follow-up were assessed for this study. Anti-MDA5 antibody was positive in 25 (7.5%) out of the 330 individuals with myositis. These 25 (21 adults, 4 juvenile) patients were followed up for a median duration of 14 months. Among adults, a majority had cutaneous manifestations 21 (84%) followed by, arthritis 17 (80%), and interstitial lung disease 12 (ILD, 57.1%). Four (19%) had rapidly progressive ILD (RP-ILD). Eight (38%) presented as clinically amyopathic DM. Among cutaneous manifestations, majority (62%) had classic features (gottron’s papules/sign, heliotrope rash) while 8 (38%) had cutaneous ulceration and 2 each had periorbital edema and tendon rupture. Eight (38%) were positive for anti-Ro-52 antibody. Out of 21 adults, 8 (38%) succumbed to the diseases. RP-ILD (n = 4; 19%), ulcerative gottron’s (n = 5) and anti-Ro-52 (n = 8) were significantly associated with mortality (p < 0.05). Upon binary logistic regression, positive anti-Ro-52 antibody predicted mortality [HR 17.3 (95%CI 1.4–210, p = 0.025)]. All juvenile anti-MDA5-positive DMs had classic cutaneous features with 2 of them having ulcerative gottron’s. None of the juvenile patients had ILD and everyone survived till the last follow-up. Indian adults with anti-MDA5 DM have high mortality. Rarer atypical features like tendon rupture or periorbital edema could assist in diagnosis. Ulcerative gottron’s, positive anti-Ro 52 antibodies, and RP-ILD are valuable clinical-serological markers that portend poor prognosis.

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Data availability

The data that support the findings of this study are available from the corresponding author, KC, upon reasonable request.

Abbreviations

ACR:

American College of Rheumatology

Anti-MDA5 DM:

Anti-MDA-5-associated dermatomyositis

EULAR:

European league against rheumatism

CPK:

Creatine phosphokinase

CSM:

Core set measures

CT:

Computed tomography

CYC:

Cyclophosphamide

DM:

Dermatomyositis

IFN:

Interferon

IIM:

Idiopathic inflammatory myositis

ILD:

Interstitial lung disease

IS:

Immunosuppression

IVIG:

Intravenous immunoglobulin

JDM:

Juvenile dermatomyositis

LDH:

Lactate dehydrogenase

MAA:

Myositis-associated antibodies

MMT8:

Manual muscle testing 8

MPS:

Methylprednisolone

MSA:

Myositis-specific antibodies

PM:

Polymyositis

RP-ILD:

Rapidly progressive ILD

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Funding

SK received intramural grant from Jawaharlal institute of postgraduate medical education and research institute (Proposal No: 119, on 19.08.2019) and from Indian Rheumatology Association grant for 2019 on 13.05.2020.

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Authors

Contributions

KC and LG conceptualised the idea and drafted the methodology. VA and VN reviewed the study design. SK and NR collected data and analysed. SK drafted the manuscript with inputs from KC and LG. KC, LG, VA and VN were involved in reviewing and editing the manuscript. All the authors contributed to the article and approved the submitted version.

Corresponding authors

Correspondence to Chengappa Kavadichanda or Latika Gupta.

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The authors declare that they have no conflict of interest.

Ethical approval

The study was conducted in accordance with the ethical standards as laid down in the 1964 Declaration of Helsinki and its later amendments after obtaining clearance independently from Jawaharlal institute of postgraduate medical education and research institute ethics committee(JIP/IEC/2019/250) and Sanjay Gandhi postgraduate Institute’s institute ethics committee (2017-41-IP-76).

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A written informed consent was obtained from the study participants.

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Disclaimer: Part of this manuscript has been published as Mehta P et al. as high early mortality in idiopathic inflammatory myopathies: results from the Inception Cohort at a Tertiary Care Centre in Northern India. Rheumatology 2021 and Rathore U et al. Psoriasiform rashes as the first manifestation of anti-MDA5 associated myositis. Rheumatology 2020 Dec 7.

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Dunga, S.K., Kavadichanda, C., Gupta, L. et al. Disease characteristics and clinical outcomes of adults and children with anti-MDA-5 antibody-associated myositis: a prospective observational bicentric study. Rheumatol Int 42, 1155–1165 (2022). https://doi.org/10.1007/s00296-021-04897-1

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