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  • Title: Need for high radiation dose (>or=70 gy) in early postoperative irradiation after radical prostatectomy: a single-institution analysis of 334 high-risk, node-negative patients.
    Author: Cozzarini C, Montorsi F, Fiorino C, Alongi F, Bolognesi A, Da Pozzo LF, Guazzoni G, Freschi M, Roscigno M, Scattoni V, Rigatti P, Di Muzio N.
    Journal: Int J Radiat Oncol Biol Phys; 2009 Nov 15; 75(4):966-74. PubMed ID: 19619960.
    Abstract:
    PURPOSE: To determine the clinical benefit of high-dose early adjuvant radiotherapy (EART) in high-risk prostate cancer (hrCaP) patients submitted to radical retropubic prostatectomy plus pelvic lymphadenectomy. PATIENTS AND METHODS: The clinical outcome of 334 hrCaP (pT3-4 and/or positive resection margins) node-negative patients submitted to radical retropubic prostatectomy plus pelvic lymphadenectomy before 2004 was analyzed according to the EART dose delivered to the prostatic bed, <70.2 Gy (lower dose, median 66.6 Gy, n = 153) or >or=70.2 Gy (median 70.2 Gy, n = 181). RESULTS: The two groups were comparable except for a significant difference in terms of median follow-up (10 vs. 7 years, respectively) owing to the gradual increase of EART doses over time. Nevertheless, median time to prostate-specific antigen (PSA) failure was almost identical, 38 and 36 months, respectively. At univariate analysis, both 5-year biochemical relapse-free survival (bRFS) and disease-free survival (DFS) were significantly higher (83% vs. 71% [p = 0.001] and 94% vs. 88% [p = 0.005], respectively) in the HD group. Multivariate analysis confirmed EART dose >or=70 Gy to be independently related to both bRFS (hazard ratio 2.5, p = 0.04) and DFS (hazard ratio 3.6, p = 0.004). Similar results were obtained after the exclusion of patients receiving any androgen deprivation. After grouping the hormone-naïve patients by postoperative PSA level the statistically significant impact of high-dose EART on both 5-year bRFS and DFS was maintained only for those with undetectable values, possibly owing to micrometastatic disease outside the irradiated area in case of detectable postoperative PSA values. CONCLUSION: This series provides strong support for the use of EART doses >or=70 Gy after radical retropubic prostatectomy in hrCaP patients with undetectable postoperative PSA levels.
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