I think the doctors and scientists have something of a race against time?
On the one hand they clearly need something better than the TRUS at actually identifying cancer.
Simultaneously the increasing risk of infection from antibiotic resistant infections means that the TRUS process may ultimately become too risky.
In May 2014 a Swedish study found that the risk of hospitalisation following the TRUS biopsy was by 2011 twice as high as it had been in 2006. This was attributed to increasing resistance of Enterobacteriaceae species, a common cause of UTI in Sweden and elsewhere.
See article ‘Severe Infections After Prostate Biopsy on the Rise’ http://www.medscape.com/viewarticle/830452
There have even been instances of men dying from the TRUS see
So all in all, those of us who have already had a TRUS biopsy, should perhaps consider ourselves lucky?