Serum NT-proBNP level was higher in infants who developed severe BPD or died and moderate BPD compared to mild BPD [4,102 (2,726–1,1665) vs. 1,438 (1,025–2,467), P = 0.005; 3,855 (2,603–6,182) vs. 1,438 (1,025–2,467), P < 0.001, respectively]. This evidence concerns the gene NPPB and bronchopulmonary dysplasia.