The invention therefore provides methods of treating a
respiratory disease characterized by
mucus hyper-
secretion comprising administering to a
human patient in need of such treatment a
gamma secretase inhibitor (GSI), wherein the administration of a GSI is effective in reducing
mucus in such patient's lungs or inhibiting
mucus accumulation in said patient's lungs. In some embodiments, the methods of the invention are effective in treating a
respiratory disease selected from the group consisting of
cystic fibrosis, chronic obstructive
pulmonary disease, primary ciliary dyskinesis,
chronic bronchitis,
asthma, idiopathic and secondary
bronchiectasis, bronchiolitis obliterans,
idiopathic pulmonary fibrosis,
respiratory infection and mucus accumulation in response to infection. Methods of the invention further include methods of treating
cystic fibrosis wherein a GSI is administered to a patient being administered or in need of a
CFTR modulator, wherein the mucus in such patient's lungs is reduced or mucus accumulation in such patient's lungs is inhibited.