Twelve of these genes (RETN, EPHX2, CD27, NOSIP, APOA1BP, TMCO6, KLHL3, B3GALNT1, SLC9A4, PRKCD, ZNF791, and B3GNT2) were also identified as differentially expressed in BPD in an independent study studying BPD markers in PBMCs (15). Here, CD27 is linked to bronchopulmonary dysplasia.