This is in response to your request above (i.e., ok, let me hear of some recommendations of good oncologists). I assume you mean medical oncologists. They are the ones to advise you on the different type of treatment available to you for recurring PC after surgery, based on your stage of PC. Then you would proceed for treatment with the applicable specialists whether it be radiation or something else.
I don't know where you live, but here is a link to some of the top PC medical oncologists:
I am sure that this list is not all inclusive and that there are many other well qualified medical oncologists specializing in PC.
Best of luck in your search.