The following information may help to address your question:
-being over 50 years of age
-having fair skin
-having a history of extensive sun exposure (natural or artificial)
-having chronic immune suppression, such as after organ transplantation or having HIV
Researchers have also found that a virus called Merkel cell polyomavirus (MCPyV) is frequently involved in the development of MCC. MCPyV is found in about 80% of tumor cells tested. This virus is thought to alter the DNA in such a way that influences tumor development.