IL10 and myasthenia gravis: Finally, in view of the level of IL-10 secreted by B10 in thymus tissues, CD19+B cells were purified by MACS, and after detection through real-time PCR and Western blot assay, the expression levels of CD19 and IL-10 in Tm+MG group were significantly higher than those in the Con and Tm groups, demonstrating that B10 was involved in thymoma progression and possibly involved in pathogenesis of thymoma with MG.