Our results showed that Ki67-positive cells in the NECP group were increased compared with those in the NEC and NECB groups (39.7 ± 14.2 vs. 22.3 ± 8.2 and 19.2 ± 7.5 cells/per field, p < 0.05, respectively). This evidence concerns the gene MKI67 and necrotizing enterocolitis.