CHST4 and myasthenia gravis: In this research, we studied the differentially expressed RNAs and their possible function between thymoma patients with and without MG, constructed a ceRNA network that might participate in the progression of TAMG, compared the patterns of the immune microenvironment and TIICs between thymoma patients with and without MG, and analyzed the function of CHST4 in thymoma patients with MG.