Re: Should I repeat a bioposy?
Depending on whether there was cancer detected at the base and how much will change the probability that they can do nerve-sparing surgery. It may also possibly show higher grades of cancer and high likelihood of extracapsular penetration which might diminish the likelihood that surgery could be a successful treatment for you.
I recall my samples were immediately preserved in wax, so I'm not sure how sponge could get in it. If it were me, I'd have it re-done at a different place after you've healed, and have it read by a prostate cancer specialty lab. The biopsy pathology report makes a BIG difference as to your treatment options.