The correlation analysis results demonstrated that in relapsed MG patients, the expression of OX40 on CD4+ T cells was positively correlated with the concentrations of AchR-Ab (r = 0.485, P = 0.022) (Figure 3(a)), while there was no significant correlation with other clinical indices (P > 0.05). Here, TNFRSF4 is linked to myasthenia gravis.