If its in the prostate and bladder, I wonder if it would show up in a urine sample? If in the uterus, how about a vaginal smear sample for tissue/cells? Or if its found in lymphoid tissue, how about a tonsil/throat swab for evidence of infection? These are much less invasive tests than tissue biopsy, or even blood samples (although tissue samples probably much more definitive at the research stage than a swab). I'm sure the WPI have already thought of all this of course. Or if not, hopefully worth a try though - & if they turn out to be positive, these could be a much cheaper alternative too.