Oncologic outcomes of radical prostatectomy with neoadjuvant LHRH agonist/estramustine and radiotherapy with neoadjuvant hormonal therapy for high-risk prostate cancer.

Abstract

259 Background: To date, the different treatment modalities for high-risk prostate cancer (Pca) have not been compared in any sufficiently large-scale, prospective, randomized clinical trial. We used propensity-score matching analysis to compare the oncological outcomes of high-risk prostate cancer between patients treated with radical prostatectomy (RP) and those treated with radiation therapy (RT). Methods: We studied 216 patients who received neoadjuvant therapy followed by RP (RP cohort) and 81 patients who received neoadjuvant androgen-deprivation therapy (ADT) followed by RT (RT cohort). The RP cohort received a luteinizing hormone-releasing hormone agonist and estramustine phosphate (280 mg/day) for 6 months prior to RP. The RT cohort received ADT for at least 6 months prior to RT using a 3-dimensional conformal radiotherapy technique. The total radiation dose was 70–76 Gy administered at 2 Gy/fraction. Results: Propensity-score matching identified 78 matched pairs of patients. The 3-year overall survival (OS) rates were 98.3% and 92.1% in the RP and RT groups, respectively (P = 0.156). The 3-year biochemical recurrence-free survival rates were 86.4% and 89.4% in the RP and RT groups, respectively (P = 0.878). Conclusions: Our study findings may suggest almost identical cancer control of RP and RT with appropriate neoadjuvant therapy in high-risk Pca. Therefore, issues of health-related quality of life may have important impact on decision making of treatment in high-risk Pca.