The result of the treatment with chlorambucil, dipyridamol, heparin/warfarin and prednisone on 50 patients as well as with imuran and prednisone on 32 patients is compared. Basis for this is a detailed morphological and clinical subdivision. With the help of therapy results is tried to derive regions of indication: the therapy with cytostatics, anticoagulants and aggregation inhibitors is above all suitable for patients with a short duration of the disease and with sign of activity, also in renal insufficiency. On the other hand the therapy with cytostatics and prednisone is also successful in patients with longer duration of the disease and missing signs of activity.