STAT3 and Patent ductus arteriosus: To assess if Napabucasin has any effect on phosphorylation of STAT3 Y705 motif, and if that is affected by MUC1 expression level, we treated high and low MUC1 PDA cells (CFPAC and MiaPaca2 respectively) with 2 μM of Napabucasin for 48 h and measured the differences in phosphorylation of STAT3 at Y705, total STAT3 and MUC1 expression levels.