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Title: Detection of Merkel cell polyomavirus and human papillomaviruses in Merkel cell carcinoma combined with squamous cell carcinoma in immunocompetent European patients. Author: Mitteldorf C, Mertz KD, Fernández-Figueras MT, Schmid M, Tronnier M, Kempf W. Journal: Am J Dermatopathol; 2012 Jul; 34(5):506-10. PubMed ID: 22505039. Abstract: BACKGROUND: About 10% of patients with Merkel cell carcinoma (MCC) suffer from an associated squamous cell carcinoma (SCC). In European patients, Merkel cell polyomavirus (MCPyV) is detectable in 60%-88% of the MCC tumors. In combined lesions, MCPyV was not detectable so far. METHODS: We investigated 2 combined tumors of MCC and SCC for the presence of MCPyV and human papillomavirus (HPV) by polymerase chain reaction and immunohistochemistry. RESULTS: In both lesions, MCPyV DNA was found, and in 1 case, HPV DNA was also detected. This is the first report of a coinfection with HPV and MCPyV in combined MCC-SCC tumors. CONCLUSIONS: The results underline the hypothesis of co-cancerogenesis of 2 oncogenic viruses in nonmelanoma skin cancer. Technical reasons and a low viral copy number of MCPyV hampering immunohistochemical detection may be responsible for the negative results in the literature.[Abstract] [Full Text] [Related] [New Search]