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  • Title: Vulvar squamous cell carcinoma and lichen sclerosus.
    Author: Scurry JP, Vanin K.
    Journal: Australas J Dermatol; 1997 Jun; 38 Suppl 1():S20-5. PubMed ID: 10994466.
    Abstract:
    There are two clinicopathological types of vulvar squamous cell carcinoma, human papillomavirus (HPV)-positive and HPV-negative, which can be distinguished to some degree on routine histology. Human papillomavirus-positive carcinomas account for one-quarter to one-third of cases, occur in women on average 20 years younger than in HPV-negative, and are associated with multiple lower genital tract neoplasia. Human papillomavirus negative carcinoma is linked to lichen sclerosus. Of all carcinomas, 7-96% show lichen sclerosus in skin adjacent to the carcinoma, the majority being the first presentation of lichen sclerosus, and up to 5% of patients with lichen sclerosus develop carcinoma after long-term follow up. Where lichen sclerosus is associated with malignancy, it is often hyperplastic, may show a subtle form of intraepithelial neoplasia termed 'differentiated vulvar intraepithelial neoplasia', and may lose its pathognomonic oedematous-hyaline layer. The local additional factors causing lichen sclerosus to develop malignancy on the vulva are not known.
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