IL1B and bronchopulmonary dysplasia: qRT‐PCR results showed that mRNA levels of TNF‐α, IL‐1β and IL‐6 were lower, but IL‐10 was higher in EPO‐MSCs injection groups than in BPD group, a more obvious change was shown in D1 + 7 group (P < 0.05, Figure 1E).