MUC1 and bronchopulmonary dysplasia: In recent years, a large number of studies have revealed that some genes, including those for vascular endothelial growth factor (VEGF) [2], interleukin 1-beta (IL-1β) [3] and mucin 1 (MUC1) [4], participate in the pulmonary developmental disorder process of BPD by regulating alveolar formation.