MuSK MG patients had a strong, significant increase in genotype frequency of HLA-DRB1*14 (genotype: OR 6.36, 95% CI 2.75–14.75, p < 0.0001), HLA-DRB1*16 (genotype: OR 5.03, 95% CI 3.16–7.99; p < 0.00001) and HLA-DQB1*05 (genotype: OR 7.94, 95% CI 3.44–18.30, p < 0.00001). Here, HLA-DQB1 is linked to myasthenia gravis.