Participants will take prednisone daily, by mouth, and low-dose methotrexate weekly, by mouth or by injection either under the skin, into a muscle or into a vein. Patients who significantly improve with treatment will gradually reduce, and eventually stop, the prednisone. If the remission lasts, methotrexate will also be reduced and stopped after 2 1/2 years. If active disease recurs, the original treatment program may be started again. Patients who never achieve complete remission with treatment but whose symptoms are well controlled and experience no serious side effects may choose to either continue low-dose methotrexate or stop therapy.