Brian,
You are obviously very knowledgable on the topic, I would like to draw your attention to a presentation made in 2003 in regards to gene therapy and valacyclovir. I found this link in my search for a link between herpes and cancer. It does not go into causality between the two, but explains how a cyclovir can possibly help in treatment.
If links are not allowed here, please edit my post and I will PM it to anyone interested.
http://www.baylorcme.org/update/presentations/butler/presentation_text.cfm About halfway down the presentation, the author specifically gets into his use of an Adenoviral vector and the HSV-tk gene. I would love your opinion on this study and it's relevance to anti-herpes drugs and the future of cancer research.
And no I do not own stock in the makers of Valtrex - I am just very excited.
Fred