MUC1 and incontinentia pigmenti: Among 18 patients with underlying IP, the difference between baseline KL-6 levels in 4 patients who developed DIIP and those in 14 patients who did not develop DIIP was not significant (DIIP: 923±818, non DIIP:781±869, p = 0.77) Baseline KL-6 levels were not associated with development of DIIP in this population.