text: In cystic fibrosis therapies under investigation include prophylactic ursodiol therapy; CF corrector VX-661; inhaled dry powder mannitol and CFTR gene therapy.
option_0: Cystic fibrosis future or investigational therapies
option_1: Cystic fibrosis medical therapy
option_2: Alpha 1-antitrypsin deficiency future or investigational therapies
option_3: Cystic fibrosis secondary prevention
option_4: Chronic obstructive pulmonary disease medical therapy
option_5: Respiratory disease medical therapy
option_6: Lung cancer medical therapy
option_7: Asthma primary prevention