HLA-DRB1 and myasthenia gravis: Other studies, conducted in cohorts of different ethnicities and often of small size, reported mixed results: an association with DRB1*04 was found in Tunisians,14 with DRB1*01 in Portuguese,15 with DQA1*02:01, DQA1*01:02, and DQB1*06:02 in Turkish16 and with DQB1*05:02 and DRB1*16 in Italian MG patients.18, 19