Abstract:
BACKGROUND:Limited data exist to guide the use of androgen deprivation therapy (ADT) for men treated with radiation therapy (RT) after radical prostatectomy (RP). The optimal duration of ADT in this setting is unknown. OBJECTIVE:To determine if the duration of ADT influences clinical outcomes for men receiving post-RP RT. DESIGN, SETTING, AND PARTICIPANTS:A total of 680 men who received adjuvant radiation therapy (n=105) or salvage radiation therapy (n=575) between 1986 and 2010 at a single tertiary care institution were reviewed retrospectively. Median follow-up post-RT was 57.8 mo. INTERVENTION:RT was delivered using three-dimensional conformal or intensity-modulated RT in 1.8-Gy fractions. For patients treated with ADT, >80% were treated with a gonadotropin-releasing hormone agonist with or without a nonsteroidal antiandrogen. OUTCOME MEASUREMENTS AND STATISTICAL ANALYSIS:Biochemical failure (BF), distant metastasis (DM), prostate cancer-specific mortality (PCSM), and overall mortality were assessed using Kaplan-Meier analysis and propensity score analysis. RESULTS AND LIMITATIONS:Overall, 144 patients (21%) received ADT with post-RP RT, most of whom had high-risk disease features such as Gleason score 8-10, seminal vesicle invasion, or pre-RT prostate-specific antigen >1 ng/ml. Median ADT duration was 12 mo (interquartile range: 6.0-23.7). Patients who received <12 mo of ADT had an association with increased BF (hazard ratio [HR]: 2.27; p=0.003) and DM (HR: 2.48; p=0.03) compared with patients receiving ≥12 mo of ADT. The 5-yr rates of DM were 6.0% and 23% for ≥12 and <12 mo of ADT, respectively. On propensity score analysis controlling for pretreatment and treatment-related factors, each month of ADT was associated with a decreased risk for BF (HR: 0.95; p=0.0004), DM (HR: 0.88; p=0.0004), and PCSM (HR: 0.90; p=0.037). These findings are limited by the retrospective nature of our analysis. CONCLUSIONS:For men with high-risk disease features receiving ADT with post-RP RT, the duration of ADT is associated with clinical outcomes. Our findings suggest that for these men an extended course of ADT ≥12 mo may be preferable. Validation of our findings is needed. PATIENT SUMMARY:We evaluated outcomes for men with high-risk disease features treated with androgen deprivation therapy (ADT) and radiotherapy after radical prostatectomy. Longer durations of ADT resulted in improved patient outcomes.
journal_name
Eur Uroljournal_title
European urologyauthors
Jackson WC,Schipper MJ,Johnson SB,Foster C,Li D,Sandler HM,Palapattu GS,Hamstra DA,Feng FYdoi
10.1016/j.eururo.2015.05.009subject
Has Abstractpub_date
2016-01-01 00:00:00pages
50-7issue
1eissn
0302-2838issn
1873-7560pii
S0302-2838(15)00410-8journal_volume
69pub_type
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