Inclusion Criteria:

          1. Histologically confirmed adenocarcinoma of the prostate.

          2. Age ≥ 18 years.

          3. Clinically localized prostate cancer:

               -  T1 (Cancer can only be seen under a microscope),

               -  NX (Regional lymph nodes cannot be assessed) or N0 (Cancer cannot be seen in the
                  lymph nodes),

               -  MX (Presence of distant metastasis cannot be assessed) or M0 (Cancer hasn't
                  spread to other parts of the body).

          4. No previous treatment for prostate cancer (including hormonal therapy, radiation
             therapy, surgery, or chemotherapy).

          5. Eastern Cooperative Oncology Group (ECOG) Performance Status 0 or 1.

          6. Patients must have the following laboratory values:

               1. Absolute neutrophil count (ANC) > 1500/µL

               2. Platelet count >100,000/µL

               3. Hemoglobin > 10 g/dL

               4. Bilirubin < 1.5 x upper limits of normal

               5. Aspartate aminotransferase (AST) < 1.5 x upper limits of normal

               6. Adequate estimated glomerular filtration rate (eGFR) > 30 mL/min per 1.73 m2
                  (adjusted for race)

          7. Patient consent has been obtained according to local Institutional Review Board for
             acquisition of research specimens.

          8. Patient is accessible and compliant for follow-up.

          9. Prostate biopsy requirements:

               1. If diagnosis was within one year of baseline visit, participant must have at
                  least one biopsy with at least 10 cores.

               2. If diagnosis was more than 1 year prior to baseline visit, participant must have
                  a minimum of 2 biopsies, one of which must be within 2 years prior to baseline
                  visit. Patients must have been diagnosed with prostate cancer within 2 years of
                  randomization (no history of prostate adenocarcinoma in any biopsies taken more
                  than 2 years prior to randomization).

         10. Must have NCCN low or favorable-intermediate risk prostate cancer defined as:

               -  <50% of cores involved with cancer for eligibility and 50% or greater of cores
                  involved with cancer progression. Only cores from standard TRUS biopsy (not
                  MRI-guided cores) will be counted towards the number of cores involved.

               -  No primary Gleason pattern 4 (Gleason score 4+3) disease in any cores (TRUS or
                  MRI-guided)

               -  PSA less than 20 ng/mL

               -  No extracapsular extension (<T3)

         11. Patients with female partners of childbearing potential must use at least one form of
             Investigator-approved contraception while on-study and for 30 days after their last
             administration of study investigational therapy. Acceptable birth control options
             include:

               1. surgical sterilization (patient and/or patient's partner),

               2. approved hormonal contraceptives or therapies (such as birth control pills,
                  Depo-Provera, or Lupron Depot),

               3. barrier methods (such as a condom or diaphragm) used with a spermicide, and

               4. an intrauterine device (IUD).

        Exclusion Criteria:

          1. Unwillingness or inability (such as coagulopathy) to undergo serial prostate biopsy.

          2. History of other malignancies, except: adequately treated non-melanoma skin cancer or
             adequately treated superficial bladder cancer (Ta) or other solid tumors curatively
             treated with no evidence of disease for > 5 years.

          3. Evidence of metastatic prostate cancer.

          4. Immune-compromised patients including but not limited to: systemic immune suppressive
             medications within 6 weeks of enrolling; HIV-positive and below normal cluster of
             differentiation 4 (CD4) lymphocytes (less than 500 cells per microliter). Patients
             must be tested for HIV seropositivity and CD4 lymphocyte count to be eligible for the
             study.

          5. Inability to give consent.

          6. Any condition that, according to the investigator, would make the patient an
             inappropriate study candidate.

          7. Patients with significant cardiac disease including heart failure that meets New York
             Heart Association (NYHA) class II and IV definitions, history of myocardial infarction
             within 6 months of study entry, uncontrolled dysrhythmias.

          8. Patients with existing autoimmune disorders (IL-2 and GM-CSF carry risk of
             exacerbating underlying autoimmune disorders).