While I believe NAC may have benificial uses and could be an additional treatment regimin to CF, I would disagree with Sakasuka that it has been proven to help the CF lungs. Clearly a Phase II study of 18, that really boiled down to 3 patients, that were not being treated w/ tobi and predisone, being compared to 3 placebo patients does not prove anything. While it has shown to decrease WBC and has the possiblity of increasing FEV1s, there needs to be a larger study to see if there is truly any benifits to NAC or if this will just be another theroy that never makes it past a Phase III study to an actual CF treatment.