The purpose of this study is to assess if using
anti-1-amino-3-[18F]fluorocyclobutane-1-carboxylic acid (FACBC or fluciclovine) PET scan will
be useful in determining if participants are responding to chemotherapy treatment.
Investigators will enroll participants whose cancer has been treated with hormone therapy and
now the cancer is not responding to the treatment (castration -resistant), and so therefore
will be started on chemotherapy. Investigators aim to enroll thirty participants in this
study.