Haneke E, Gutschmidt E
Dermatologica. 1979;158(5):384-8. doi: 10.1159/000250785.
A constant gradual malignant degeneration of verrucous hyperkeratoses was observed in a now 16-year-old poikiloderma congenitale patient although topical immunotherapy of the warty lesions was partially successful and led to an improvement of T-cell functions.