Are you confident, based on the evidence to date, that it does work?
The totality of all data available on Provenge (phase 1&2 trial, D9905, P16, P11, D9901, D9902a) says that it is an active agent. As you know, a statistical proof is always subjected to the will of the quantum God. So, there is always a chance of some colossal coincidence that made the data from all these trials show what they showed. But, yes, within the limited extent of my perception, I believe that Provenge works.