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Journal Article
Are there multiple cells of origin of Merkel cell carcinoma?
2018
Overview
Merkel cell carcinoma (MCC) is a rare but lethal cancer with the highest case-by-case fatality rate among all skin cancers. Eighty percent of cancers are associated with the Merkel cell polyomavirus (MCPyV). Twenty percent of MCCs are virus negative. Recent epidemiological data suggest that there are important, clinically relevant differences between these two subtypes of MCC. Recent studies in cancer genomics, mouse genetics, and virology experiments have transformed our understanding of MCC pathophysiology. Importantly, dramatic differences in the genetics of these two MCC subtypes suggest fundamental differences in their pathophysiology. We review these recent works and find that they provocatively suggest that MCPyV-positive and MCPyV-negative MCCs arise from two different cells of origin: the MCPyV-negative MCC from epidermal keratinocytes and the MCPyV-positive MCC from dermal fibroblasts. If true, this would represent the first cancer that we are aware of that evolves from cells of origin from two distinct germ layers: MCPyV-negative MCCs from ectodermal keratinocytes and MCPyV-positive MCCs from mesodermal fibroblasts. Future epigenetic experiments may prove valuable in confirming these distinct lineages for these MCC subtypes, especially for the clinical importance the cell of origin has on MCC treatment and prevention.
Publisher
Nature Publishing Group UK,Nature Publishing Group
Subject
/ 64/60
/ Animals
/ B cells
/ Cancer
/ Carcinoma, Merkel Cell - etiology
/ Carcinoma, Merkel Cell - genetics
/ Carcinoma, Merkel Cell - pathology
/ Carcinoma, Merkel Cell - virology
/ Cell Transformation, Neoplastic - genetics
/ Cell Transformation, Viral - physiology
/ Genetics
/ Genomics
/ Humans
/ Medicine
/ Merkel cell polyomavirus - physiology
/ Mice
/ Oncology
/ Polyomavirus Infections - complications
/ Polyomavirus Infections - pathology
/ Skin
