In a prospective pilot study nested in the EPIC-Oxford cohort, we examined the seroprevalence of antibodies against the L1 antigen of 38 human papilloma virus (HPV) types among 39 cases of cutaneous squamous cell carcinoma (SCC) for whom plasma was collected prior to diagnosis (incident) and 80 controls. Fifteen cases having already developed SCC at blood collection (prevalent) were also tested. There were no statistically significant differences in the seroprevalence of antibodies against any of the HPV types examined between incident cases and controls, nor was there a difference in the seroprevalence of multiple infections. However, consistent with results from published case-control studies, the seroprevalence of many b-HPV types was higher among prevalent cases than among either incident cases or controls. For example the seroprevalence of antibodies against HPV-8 was 20% (16/80) in controls, 23% (9/39) among incident cases and 40% (6/15) among prevalent cases. Among the incident cases only, the seroprevalence was 16% (5/32) among those for whom blood was collected 181 months prior to diagnosis, but 57% (4/7) among those for whom diagnosis was within 18 months of blood collection, a pattern seen for many of the HPV types. This might suggest that if HPV is involved in the aetiology of SCC, the process occurs close to the time of diagnosis, or that the antibody response observed in people with SCC is a consequence of tumor formation. Further and larger prospective studies are needed to clarify the role of HPV in the aetiology of cutaneous SCC. ' 2007 Wiley-Liss, Inc.Key words: Epidemiology; human papillomavirus (HPV); serology; cutaneous squamous cell carcinoma (SCC); prospective case-control Nonmelanoma skin cancer (NMSC), comprising basal cell carcinoma (BCC) and squamous cell carcinoma (SCC) in a ratio of about five to one, is the most commonly diagnosed cancer in white populations. Established risk factors include exposure to solar ultra-violet radiation and, for SCC in particular, immunosuppression, such as that experienced by organ transplant recipients.1-4 In addition, there is some evidence of an association between certain human papillomaviruses (such as HPV types 5 and 8) and the development of cutaneous SCC (but not basal).5 To date, more than 118 papillomaviruses have been completely described, of which about a hundred infect humans. 6 The alpha types, particularly HPV-16, 18, 33 and 45, are well established causes of cancer of the uterine cervix; the viral E6 and E7 proteins are associated with the degradation of tumor suppressors p53 and pRb, respectively.
7A role for HPV in the aetiology of skin cancers is uncertain, although evidence of possible molecular mechanisms is emerging with HPV probably working as a co-factor with ultraviolet radiation early in the development of SCC.
8Most studies of HPV and cutaneous SCC have used HPV-DNA detection methods to examine the association. Because of the high sensitivity of PCR methods and the ubiquity of HPV, previously unknown types are often identified...