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No significant correlation of HLA-B8 and amount of antibodies directed to acetylcholine receptor protein in patients with myasthenia gravis.

Forty patients with myasthenia gravis were HLA tissue typed and the amount of anti-acetylcholine receptor protein antibody determined. Sera from seven patients were tested for antibody titer by repeated determinations and the serum concentration was found to be stable. Patients with thymoma had higher titers than patients with normal thymus histology or hyperplasia. Individuals with thymoma lacking HLA-B8 were found to have a higher concentration of antibodies than HLA-B8 negative individuals with hyperplasia. No statistically significant differences were obtained when comparing the amount of antibody in HLA-B8 positive and negative individuals. Titers in patients subjected to thymectomy more than 8 years before sampling did not deviate from those in non-thymectomized myasthenics.