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Antibody profile may predict outcome in ocular myasthenia gravis

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Abstract

An unsolved issue remains whether there are clinical and immunological features to predict in a single patient the risk of conversion from ocular Myasthenia Gravis (OMG) to generalized disease (GMG) as 50–60% of patients may progress within 1–2 years since onset. Anti-acetylcholine receptor antibodies (AChR Abs) are found in up to 50% of OMG patients; muscle-specific tyrosine kinase antibodies (MuSK-Abs) are present in about 70% of the whole seronegative (SN), who usually develop a severe disease with bulbar involvement. We surveyed a cohort of 175 OMG patients with purely ocular symptoms and we compare the outcome of patients with antibodies to AChR or to MuSK with those seronegative for both Abs (DSN). All patients had purely ocular signs for at least 24 months. Gender, age at onset, time to generalization or to worsening in quantitative ocular QMG scores, electrophysiological results were analyzed. Males were 58.9%, females 41.1%. Patients with late onset of symptoms after 50 years (LOMG) were 78.3%. We assayed anti-MuSK-Abs in 4.7%, anti-AChR Abs in 38.5%; 57.3% were defined DSN. Thirty-seven patients (21.1%) progressed to GMG during the observational time: 23 were females, 62% of the whole group of the generalized subjects, 75% of MuSK-positive OMG converted to GMG versus the 26.2% of AChR positive and 13.7% of DSN. Statistical analysis showed that gender and presence of antibodies either to AChR or to MuSK were independent predictors of worse outcome; the DSN subjects had lower risk of conversion to GMG.

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Correspondence to Giuliana Galassi.

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This article does not contain any studies with human participants or animals performed by any of the authors. All the procedures were accordance with the ethical standard of yhe Instutional/ and/or national research committee and with the 1964 Helsinki declaration and its later amendements or comparable ethical standards. The original study on Myasthenia gravis was approved by Institutional University Hospital Ethic Board.

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Galassi, G., Mazzoli, M., Ariatti, A. et al. Antibody profile may predict outcome in ocular myasthenia gravis. Acta Neurol Belg 118, 435–443 (2018). https://doi.org/10.1007/s13760-018-0943-7

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