Clinical heterogeneity and prognostic factors of anti-synthetase syndrome: a multi-centred retrospective cohort study.

Objective: Anti-synthetase syndrome (ASyS) patients have heterogeneous clinical manifestations with different initial presentations, complications and outcomes. This study aimed to assess the clinical characteristics and complications in patients with ASyS, and to identify factors that were associated with the survival of ASyS patients.

Methods: This was a retrospective multicentre longitudinal study.

Reduced bone mineral density in patients with idiopathic inflammatory myopathies: a case-control study.

Background: Patients with idiopathic inflammatory myopathies (IIMs) are at risk of reduced bone mineral density (BMD).

Objectives: To compare the prevalence of reduced BMD between patients with IIMs and controls and to determine its risk factors.

Design: This was a single-center case-control study.