<qa>  What is the difference between thymectomy and prednisone?Learning that thymectomy results in a meaningful reduction of prednisone dosage or even full withdrawal or reduces side effects related to prednisone would support using the two treatmentsthymectomy and prednisonetogether. However, if no meaningful reduction of prednisone dosage or side effects is shown, the results would mean that using the two treatments together offers no advantages over prednisone treatment alone. 