Klotho concentration was decreased in cord blood of preterm infants who developed BPD and BPD–PH compared with controls (BPD = 1,306 pg/ml [967, 2585]; BPD–PH = 1529 pg/ml [1126, 3153]; and control = 2,726 pg/ml [1784, 3435], both P < 0.05 (Fig. 1). The gene discussed is KL; the disease is bronchopulmonary dysplasia.