Subgroup analyses stratified by ethnicity (Asian or Caucasian) demonstrated no significant association between the HLA-DQB1*030x polymorphism and the risk for GBS in Asians (OR: 0.76, 95% CI: 0.73–1.13; P = 0.07) or Caucasians (OR: 1.14, 95% CI: 0.81–1.60; P = 0.46) (Fig 3B). The gene discussed is HLA-DQB1; the disease is Guillain-Barre syndrome.