Alleles of the HLA-DRB class II gene represented six out of the eight HLA alleles associated with MG and include HLA- DRB1*04:04, DRB1*01, DRB1*03, DRB1*04, DRB1*15:01 and DRB1*09 (Table 5). HLA-DQB1*02 and DQB1*03 of the class II gene represented the other alleles found. This evidence concerns the gene HLA-DRB1 and myasthenia gravis.