Overall, in our study the associations between MG and class I HLA alleles outnumbered the ones with class II HLA alleles; this can be partially justified by the predominance of EOMG cases, as this MG subtype is more frequently linked with HLA-A, B and C alleles in both Caucasians and non-Caucasians [7,8,10,31,32,33]. Here, HLA-A is linked to myasthenia gravis.