I have been trying to learn as much as I can about what is known about XMRV from the research already done in those who suffer from prostate cancer. I came across this in another forum which poses a few questions.
A bit of musing: The XMRV is capable of infecting prostate cells via the XPR1 receptor. This receptor has also been detected in the spleen, lymph node, thymus, leukocytes, bone marrow, heart, kidney, pancreas and skeletal muscle. However, besides the prostate, there haven't been a lot of studies regarding the effect of retroviruses and XPR1. However, one lab study has shown that a retrovirus can cause heart damage. See:
http://jvi.highwire.org/cgi/content/full/81/22/12307
Therefore, could the XMRV be responsible for the cardiomyopathy that Cheney believes is the cause many of the symptoms in CFS?