Bronchopulmonary Dysplasia (BPD) is a form of Chronic lung disease and results from extreme pre-term birth. Systemic corticosteroid therapy is used postnatally to reduce the severity of BPD, however there is a large range in the phenotypic response to this treatment. In this episode, we speak to Tamorah Lewis, a neonatologist at Children's Mercy Hospital in Kansas City, who aimed to identify pharmacogenetic variants associated with the clinical response to systemic corticosteroid treatment.