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Mortality and prognostic factors in idiopathic inflammatory myositis: a retrospective analysis of a large multicenter cohort of Spain

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Abstract

The present study was undertaken to assess mortality, causes of death, and associated prognostic factors in a large cohort of patients diagnosed with idiopathic inflammatory myositis (IIM) from Spain. A retrospective longitudinal study was carried out in 467 consecutive patients with IIM, identified from 12 medical centers. Patients were classified as primary polymyositis, primary dermatomyositis (DM), overlap myositis, cancer-associated myositis (CAM), and juvenile idiopathic inflammatory myopathies. A total of 113 deaths occurred (24%) after a median follow-up time of 9.7 years. In the overall cohort, the 2-, 5-, and 10-year survival probabilities were 91.9, 86.7, and 77%, respectively. Main causes of death were infections and cancer (24% each). Multivariate model revealed that CAM (HR = 24.06), OM (HR = 12.00), DM (HR = 7.26), higher age at diagnosis (HR = 1.02), severe infections (HR = 3.66), interstitial lung disease (HR = 1.61), and baseline elevation of acute phase reactants (HR = 3.03) were associated with a worse prognosis, while edema of the hands (HR = 0.39), female gender (HR = 0.39), and longer disease duration (HR = 0.73) were associated with a better prognosis. The standardized mortality ratio was 1.56 (95% CI 1.28–1.87) compared to the Spanish general population. Our findings indicate that IIM has a high long-term mortality, with an excess of mortality compared to the Spanish population. A more aggressive therapy may be required in IIM patients presenting with poor predictive factors.

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Acknowledgements

This research was partially supported by a grant from MSD-SORCOM. We would like to thank all our collaborators who have contributed to the REMICAM cohort. We would also like to thank the Spanish Society of Rheumatology for technical support and the Society of Rheumatology of Madrid (SORCOM) for logistic and human support in this study.

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Correspondence to Laura Nuño-Nuño.

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This study does not contain any studies with animals performed by any of the authors.

Conflict of interest

Laura Nuño-Nuño has received a research grant from MSD. Francisco Javier López-Longo has received speaker fees from Roche, Bristol-Myers Squibb, UCB and GSK. Beatriz Joven, Patricia Carreira, Valentina Maldonado-Romero, Carmen Larena-Grijalba, Irene Llorente-Cubas, Eva Tomero, María Carmen Barbadillo-Mateos, Paloma García de la Peña Lefebvre, Lucía Ruiz-Gutiérrez, Juan Carlos López-Robledillo, Henry Moruno-Cruz, Ana Pérez-Gómez, Tatiana Cobo-Ibáñez, Raquel Almodóvar, Leticia Lojo-Oliveira, and María Jesús García-de Yébenes declare that they have no conflict of interest.

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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee, and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards. For this type of study formal consent is not required.

Funding

This study was partially funded with a grant from MSD (MSD-SORCOM).

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Nuño-Nuño, L., Joven, B.E., Carreira, P.E. et al. Mortality and prognostic factors in idiopathic inflammatory myositis: a retrospective analysis of a large multicenter cohort of Spain. Rheumatol Int 37, 1853–1861 (2017). https://doi.org/10.1007/s00296-017-3799-x

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  • DOI: https://doi.org/10.1007/s00296-017-3799-x

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