To be eligible, men in either group must have rising serum prostate specific antigen (PSA) level - defined as at least 2 consecutive rises in PSA documented over a reference value (1st measure within 28 days prior to recruitment). The first rising PSA (2nd measure) should be taken at least 14 days after the reference value. A confirmatory PSA measure (3rd measure) obtained at least 14 days after the 2nd measure is required and must be greater than the 2nd measure. Additionally, patients must have a serum PSA concentration of at least 2 ng/mL in addition to increasing PSA to be eligible. Patients will be followed with the PET-CT at 4, 8, and 12 months after the initiation of androgen ablation therapy (Group I) or chemotherapy (Group II).