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Autoantibody testing in myositis: an update.

Fionnuala K McMorrow¹, Natalie Anwyll², Sarah L Tansley^1,2

¹Department of Life Sciences, University of Bath.

Current Opinion in Rheumatology

|August 19, 2024

Summary

This summary is machine-generated.

Myositis autoantibody testing strategies are reviewed, highlighting limitations in current immunoassays. Reliable detection is crucial for patient care, especially considering potential impacts on malignancy and lung disease diagnoses.

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Area of Science:

Rheumatology
Immunology
Diagnostic Medicine

Background:

Myositis autoantibodies are key biomarkers in diagnosing inflammatory myopathies.
Current diagnostic strategies rely heavily on autoantibody detection.

Purpose of the Study:

To update on myositis autoantibody testing strategies.
To evaluate the reliability and utility of various detection methods.

Main Methods:

Review of solid-phase immunoassays.
Assessment of newer discovery techniques for autoantibody detection.

Main Results:

Current immunoassays have limitations, especially in low pretest probability populations.
Low incidence reduces positive predictive value, despite high sensitivity/specificity for some antibodies (e.g., anti-Jo1).
Line immunoassays show low sensitivity for critical antibodies like anti-TIF1γ and rare antisynthetase antibodies.

Conclusions:

Reliable, accessible, and affordable myositis autoantibody tests are in high demand.
Inaccurate results can significantly impact patient management, particularly concerning malignancy and lung disease.
Clinicians must interpret test results considering clinical context and specific test limitations.