Surgery With or Without Docetaxel and Leuprolide or Goserelin in Treating Patients With High-Risk Localized Prostate Cancer

RATIONALE: Drugs used in chemotherapy, such as docetaxel, work in different ways to stop the growth of tumor cells, either by killing the cells or by stopping them from dividing. Androgens can cause the growth of prostate cancer cells. Antihormone therapy, such as goserelin and leuprolide, may stop the adrenal glands from making androgens. Giving docetaxel and leuprolide or goserelin before surgery may make the tumor smaller and reduce the amount of normal tissue that needs to be removed. It is not yet known whether giving docetaxel and leuprolide or goserelin before surgery is more effective than surgery alone in treating patients with prostate cancer.

PURPOSE: This randomized phase III trial is studying docetaxel and leuprolide or goserelin to see how well they work when given before surgery compared with surgery alone in treating patients with high-risk localized prostate cancer.

This randomized trial tests whether the addition of chemohormonal therapy improves PSA-progression free survival in patients with high risk, clinically-localized prostate cancer. The neoadjuvant approach is taken since there appears to be a higher acceptance rate in the prostate population for this type of therapy and several phase II trials have demonstrated its safety. Multiple chemotherapeutic therapies have shown efficacy in advanced prostate cancer and docetaxel has become the community standard. Many high risk patients are initiated on LHRH agonists at or near the time of diagnosis of their prostate cancer. In order to allow the inclusion of these patients in the protocol, enhanced enrollment and maintain compliance with therapy, up to 3 months of androgen deprivation therapy prior to enrollment will be permitted. This study will therefore be able to test the hypothesis that targeting both androgen-sensitive and chemotherapy- sensitive prostate cancer cells will improve outcomes in these high-risk patients.

OUTLINE: This is a multicenter, randomized study. Patients are stratified according to nomogram-predicted biochemical progression-free survival at 5 years (0-20.9% vs 21-39.9% vs 40-59.9% vs ≥ 60%) and androgen-deprivation therapy prior to randomization ≤ 4 months (no vs yes). Patients are randomized to 1 of 2 treatment arms. Please see the Arms sections for more details.

The primary and secondary objectives are described below.

Primary:

• To determine whether treatment with neoadjuvant docetaxel and androgen deprivation therapy prior to radical prostatectomy will increase the rate of 3-year biochemical progression-free survival (bPFS) compared to treatment with immediate radical prostatectomy alone for high-risk prostate cancer patients.

Secondary:

• To compare the 5-year bPFS rate, bPFS, disease progression, disease-free survival, and overall survival of patients randomized to the two arms of this trial
• To determine the safety and tolerability of neoadjuvant docetaxel and androgen deprivation therapy prior to surgery for high-risk patients undergoing radical prostatectomy
• To compare the impact of neoadjuvant docetaxel and androgen deprivation therapy on time to clinically apparent local disease recurrence and metastatic disease in high-risk patients undergoing radical prostatectomy for clinically localized prostate cancer
• To compare the impact of neoadjuvant docetaxel and androgen deprivation therapy relative to RP on pathologic tumor stage, frequency of lymph node metastases and positive margin rates for high-risk patients undergoing radical prostatectomy for clinically localized prostate cancer
• To determine if changes in serum testosterone levels will predict bPFS
• To determine prospectively whether PSA doubling time (PSADT) is a surrogate endpoint for time to clinical metastases and overall survival

Patients are followed up to 15 years post-randomization.