Maren Denison, third-year student at the University of Iowa, was in sixth grade when she found out her lung function had dropped to 60 percent as half of her lung had collapsed and was scarred shut.

Cystic fibrosis is a genetic disorder that affects roughly 40,000 Americans. The condition is caused by a mutation in the patient's cystic fibrosis transmembrane conductance regulator (CFTR) gene, ...