An international, open-label Phase 3 study, co-led by Susanna McColley, MD, from Ann & Robert H. Lurie Children’s Hospital of Chicago, found that a regimen of three drugs (elexacaftor/tezacaftor/ivacaftor) that targets the genetic cause of cystic fibrosis was safe and effective in 6-11-year-olds with at least one copy of F508del mutation in the CFTR gene, which is estimated to represent almost 90 percent of the cystic fibrosis population in the United States.