Worldwide, approximately 3% of men die from prostate cancer. The lifetime risk in developing prostate cancer is 1 in 6 (US). Xenotropic murine leukemia virus–related virus (XMRV) was discovered recently in human prostate cancers. It is the first gammaretrovirus that is known to infect humans.
XMRV is present in malignant prostatic epithelium and is associated with prostate cancer, especially high-grade tumors. PNAS USA September 8 2009 doi:10.1073/pnas.0906922106
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