[Age of Reason]

Could some cancers be contagious? New evidence suggests certain types of cancer can spread from one person to another.
http://www.wnyc.org/shows/lopate/episodes/2008/03/13

[aculeus]

Could some cancers be contagious?

Some are known to be transferred from one animal to another. Two I've read about are a certain venereal cancer in dogs and a mouth cancer in Tasmanian Wolves which can be transferred through contact. It's not "contagious" the way the flu is contagious. The cells of the cancerous animal find a home in the recipient animal and continue to multiply. I think such transfers are extremely rare in humans.

For your reading pleasure, courtesy of Google Scholar:

http://www.sciencemag.org/cgi/content/summary/307/5712/1035

http://www.ncbi.nlm.nih.gov/sites/entrez?db=pubmed&uid=3887857&cmd=showdetailview&indexed=google