MKI67 and incontinentia pigmenti: Of the 51 cases (42 cases of dysplasia and 9 IP cases in which the histological evaluation of H&E-stained sections disclosed an increased proliferation of tumor cells), 46 (35.4 %) tumors have high IHC Ki67 index, and only 5 (3.8 %) cases were Ki67 low-stained.