The National Heart, Lung, and Blood Institute (NHLBI) seeks feedback from the small business community regarding the current state of the science and commercial feasibility of using in vitro human cellular models as an experimental tool for predicting in vivo drug responses to cystic fibrosis transmembrane conductance regulator (CFTR)-directed therapeutics for Cystic Fibrosis (CF) lung disease at the individual level. Responses to this Request for Information (RFI) will assist NHLBI staff in assessing the value of the research in areas related to advancing precision medicine approaches to treatment.