Review
Human papillomaviruses and skin cancer

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Abstract

Cutaneous epidermodysplasia verruciformis (EV)-associated human papillomaviruses (HPVs) are found frequently in skin cancers especially in immunosuppressed people. They are also detectable in the normal skin and hair follicles of a proportion of individuals who have no immune defect. The available evidence to link HPVs causally with skin carcinogenesis is not conclusive, but includes epidemiological, molecular and immunological studies.

Introduction

The association between human papillomavirus (HPV) infection and squamous cell neoplasia of the lower genital tract is now well established with many lines of good evidence supporting a causative relationship. The role of HPVs in the development of cutaneous malignancy is not as definite, but nevertheless, there is emerging evidence to suggest that they have a potentially important part to play in the process of skin carcinogenesis.

Section snippets

Epidermodysplasia verruciformis

Cancer-associated skin HPV types were first discovered in patients with the rare condition of epidermodysplasia verruciformis. Those affected have a mild but demonstrable defect of cell-mediated immune responses and develop warty and scaly areas of skin, especially on sun-exposed sites, in their childhood and early adult life (Majewski and Jablonska, 2001). Most will also have squamous cell carcinomas (SCCs) of the skin appearing before the age of 40 and in many cases, the skin malignancies can

Molecular

Many studies have examined the skin lesions in immunosuppressed individuals and also immunocompetent people for the presence and type of HPV DNA. Early work with renal transplant patients using DNA extraction and restriction enzyme analysis has been superceded by the application of sensitive PCR DNA amplification using degenerate primer sets to increase the detection of many different types (reviewed in Harwood and Proby, 2002). Cutaneous HPVs of the EV or EV-related and putative new EV-related

Biological effects of EV and EV-related HPVs

The presence of certain HPVs within skin cancers is, by itself, not a proof of causative association, and the finding of the same types of viral DNA in normal skin and hair follicles of both immunosuppressed and immunocompetent individuals weakens the possibility of a direct neoplastic effect. If cutaneous HPVs contribute to the process of carcinogenesis, they must, in some way, influence the normal cellular processes. The list of ways in which genital high-risk types interact with cellular

Genetic variation in susceptibility to HPV-associated skin cancer

Mutations within the p53 gene are extremely common in many cancers including skin cancers (Padlewska et al., 2001). The p53 gene occurs in two common polymorphisms involving the amino acid at codon 72 which may occur either as arginine or proline and it has been shown that the E6 from the high-risk genital HPVs is able to degrade the arginine/arginine homozygous form much more efficiently than the proline/proline form (Storey et al., 1998). In spite of little evidence that the interaction

Conclusion

Until more is understood about the precise role of HPVs in the development of skin cancers, there is no obvious antiviral approach to the prevention or treatment of such lesions. The use of an animal model for investigation into the mechanisms of tumour formation with HPV 16 has been very fruitful and could usefully be extended to examine the EV HPVs. For the present, patients who are immunosuppressed for years should receive detailed information about the risks of skin cancer, and ideally be

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