IL6 and bronchopulmonary dysplasia: In this study, cord blood IL-6 levels in FIRS patients with MIR/FIR were higher than in FIRS patients without MIR/FIR; however, the presence or absence of MIR/FIR did not adversely affect BPD, neonatal outcomes, and FIRS patients without MIR/FIR were higher for incidence of extremely low gestational age.