In my original post I was paraphrasing what my MO told me on Thursday last week.
That is true that prostate cancer is almost parasitic - unless it leaves the prostate capsule - then you are in deep trouble. Recently they determined that early detection of prostate cancer can actually increase morbidity so they are not recommending PSA tests like they used too, although my GP still routinely orders them for me.

I should also mention that cancer is patient, waiting until the immune system starts to decline in the mid 50's.

The viral connection is a fascinating new wrinkle but unfortunately now persons much younger than 55 are showing up here, which was a rarity in 2002.

Years ago I worked for a company that attempted to push for transrectal ultrasound as an early detection screening. The death rate went up 5% from complications from the biopsy, most of which were negative anyway.

The FDA takes false positives very seriously and this is what precipitated the mammography quality assurance act. Too many women were getting unnecessary biopsies... This is why new imaging modalities have been developed for dense breast tissue and also adjunctive ultrasound screening as well.