To determine the effects of cyclophosphamide compared with prednisone, dapsone, or high-dose
intermittent 'pulse' therapy with methylprednisolone in patients with idiopathic pulmonary
fibrosis. Also, to evaluate the use of intermittent, short-term, high-dose intravenous
corticosteroids in patients with sarcoidosis. There were actually four separate clinical
trials.