A steroid-requiring patient is one who was previously stable but who ultimately experiences (a) increased symptoms associated with radiographic deterioration, and/or, (b) met the criteria for relapse and/or functional deterioration. In addition, patients who were prescribed prednisone for sarcoidosis, but have self-discontinued it (yet still have clinical and symptomatic disease and/or evidence of pulmonary functional deterioration) will be considered steroid-requiring.