Inclusion Criteria:

1. Organ confined prostate cancer (stage T1-T2c) subsequent to clinical staging

2. Radical prostatectomy and bilateral lymph node dissection performed

3. Pathologic assessment of surgical specimens by MDACC pathologist

4. High risk of clinical or biochemical failure post prostatectomy (must fulfill one of
the following criteria): pathology; a) Gleason grade sum score greater than or equal
to 8, b) Seminal vesicle involvement, c) Extraprostatic extension with positive
surgical margins and Gleason greater than or equal to 7

5. Radical prostatectomy performed within 90 days of enrollment and serum PSA level <
0.1ng/ml

6. Written informed consent

Exclusion Criteria:

1. Any evidence of metastatic disease confirmed prior to enrollment

2. Inability to confirm pathologic risk factors or inadequate prostatectomy (see item
4.1.5).

3. Hormonal ablation for greater than 3 months or radiotherapy for prostate cancer

4. Failure to achieve prostate specific antigen level of less than 0.1ng/ml prior to
enrollment in study

5. Elevation of liver function tests 2x normal

6. Contraindication to the use of LH-RH agonists or antiandrogens

7. Active secondary malignancy (other than squamous or basal cell skin cancer) within
five years prior to enrollment in study

8. Any concomitant medical condition that would make it undesirable for the 7patient to
participate in the trial or jeopardize compliance with the protocol