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Annexin-A5 resistance and non-criteria antibodies for the diagnosis of seronegative antiphospholipid syndrome

Abstract

In this study, we aimed to analyze the value of annexin-A5 anticoagulant ratio (A5R) and non-criteria antibodies for the diagnosis of APS in patients with clinical seronegative APS. Three groups were defined, including 21 seronegative APS patients with unexplained obstetrical adverse events or thrombosis history, 15 confirmed APS patients with triple aPL positivity, and a control group of 20 healthy patients without any history of thrombosis or pregnancy complications. Seronegative APS patients have similar levels of A5R in comparison to healthy controls (202% [171%–238%] versus 191% [178%–221%]; p = 0.65), whereas triple-positive APS patients have significantly more reduced A5R in comparison to both seronegative and healthy patients (149% [138%–158%] versus 202% [171%–238%] and 191% [178%–221%], respectively, p < 0.001). The non-criteria aPL were found in 24% of seronegative APS: anti-PE IgM in 3 cases (14%) and anti-PS/PT IgG and anti-PS/PT IgM in 1 (5%) case each. The frequency of non-criteria APL was significantly more frequent in comparison to healthy controls (p = 0.048). All triple-positive APS patients have at least one non-criteria aPL, and the non-criteria aPL were significantly more frequent in these patients compared to seronegative APS and healthy controls (p < 0.001). Whereas A5R levels do not allow to discriminate seronegative APS from healthy controls, our results demonstrate that non-criteria aPL can help to APS diagnosis in clinical seronegative APS.

Key points
Annexin-A5 resistance testing does not help for the diagnosis of seronegative APS.
The non-criteria antiphospholipid antibodies can contribute to APS diagnosis in patients without conventional antibodies.

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Correspondence to Arsene Mékinian.

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Ferreira, T.G., Delhommeau, F., Johanet, C. et al. Annexin-A5 resistance and non-criteria antibodies for the diagnosis of seronegative antiphospholipid syndrome. Clin Rheumatol (2020) doi:10.1007/s10067-019-04915-5

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Keywords

  • Annexin-A5
  • Annexin-A5 resistance
  • Antiphospholipid antibodies
  • Antiphospholipid syndrome
  • Non-criteria antibodies
  • Seronegative