<qa>  How many patients will be randomized into three treatment groups of five patients each?Fifteen patients will be randomized into three treatment groups of five patients each. The first group will receive a standard drug regimen, based on the 1997 ATS guidelines. The second and third groups, in addition to receiving the standard therapy, will also receive three months of IFNgamma and GM-CSF, respectively. All patients will undergo bronchoscopy with bronchoalveolar lavage BAL at the beginning of the study, after three months, and at six months. 