HLA-B and myasthenia gravis: Since HLA-B*40 presented a weak, however novel positive association with MG, with a significantly higher frequency in the myasthenic patients when compared to the general population of Romania, we next compared clinical and thymic features between carriers (n = 8) and non-carriers (n = 32) in order to investigate the possibility whether this allele could represent a disease biomarker (Table 3).