MUC1 and incontinentia pigmenti: Pretreatment serum KL-6 (1104.0 ± 555.1 vs. 823.8 ± 821.0 U/mL; P = 0.09) levels and SP-D (221.7 ± 118.7 vs. 120.5 ± 78.1; P = 0.11) levels of patients with AE-IP tended to be higher than that of patients without AE-IP.