A Tale of Two Infants: Off-Label Use of Elexacaftor/Tezacaftor/Ivacaftor in Early Cystic Fibrosis Treatment.

The management of cystic fibrosis (CF) has significantly improved with the approval of the CF transmembrane conductance regulator (CFTR) modulators. Elexacaftor/tezacaftor/ivacaftor (ETI) is approved for treatment in people with CF (pwCF) over the age of 2 years with eligible mutations. We report 2 cases highlighting improved clinical outcomes following exposure to ETI in an off-label use, including enhanced nutrition status, decrease in respiratory support, exacerbation rates, and need for antibiotics in one of the infants and resolution of echogenic bowel that was diagnosed in utero in the second.