It is certainly possible but I don't think the oncologist will be particularly interested in knowing - so unlikely to offer a new biopsy unless your OH really pushes for one. What matters to the onco is where the active cancer cells are - in the prostate or further afield - so that they can decide what treatment is available and when is the optimum time to start it. I could be wrong but I don't think you should over-worry about how you are going to get him to agree to a biopsy that may never be required.