Multiple logistic regression revealed that severe gastric mucosal atrophy (odds ratio [OR], 8.53; 95% confidence interval [CI], 1.47–49.4; p = 0.016) and high gastrin levels (OR, 8.31; 95% CI, 1.89–36.4; p = < 0.01) were significantly independent risk factors for the development of MG (Table 3). The gene discussed is GAST; the disease is myasthenia gravis.