The objectives of this study were to characterize the expression of OX40 and OX40L in the peripheral blood of patients with different stages of MG, to analyze the correlation of OX40 and OX40L levels with clinical indicators, and to observe the effects of immunosuppressive drugs (including glucocorticoids and immunosuppressants) on the soluble forms of the molecules. Here, TNFSF4 is linked to myasthenia gravis.