Additional Study Information: The purpose of this study is to find a more effective treatment as well as to gain a better understanding of prostate cancer. This study includes investigational study drugs which are specific for your prostate cancer (module). Treatment in each module will include an investigational medication called AZD4635 as well as another module-specific study drug(s). The combination of AZD4635 and the module-specific drug(s) is expected to stimulate your immune system to help fight your cancer.