GDNF and necrotizing enterocolitis: In the second sample, the median (range) values of GFAP [2.40 (0.30–3.10) vs. 0.30 (0.10–0.60) P = 0.003], GDNF [2.99 (0.56–10.30) vs. 1.46 (0.85–2.24) P = 0.019], and FABP-2 [646.8 (179.20–1,571.00) vs. 314.90 (184.70–521.60) P = 0.040] in the group with NEC were significantly higher than those in the group without NEC.