Outcomes and predictors of localized or locally-advanced prostate cancer treated by radiotherapy in Indonesia.
OBJECTIVE
Presently there is no published data on the outcomes of localized or locally-advanced prostate cancer (PCa) treated by external-beam radiotherapy (RT) in Indonesia.


METHODS
This study retrospectively analyzed 96 patients with localized or locally-advanced PCa treated by RT from year 1995 to 2009, at the national referral hospital and the national cancer hospital of Indonesia. Cumulative prostate and pelvic radiation dose/type was <70 Gy conventional RT in 84.4% patients, and ≥70 Gy Three dimensional-conformal or intensity modulated RT in 15.6% patients. Overall survival (OS) and biochemical progression-free survival (BFS) were estimated by Kaplan-Meier. Predictors of OS and biochemical recurrence were analyzed by multivariate Cox regressions.


RESULTS
The median follow-up was 61 months (range, 24 to 169 months). There were 3.1% low-risk, 26% intermediate-risk, and 70.8% high-risk cases. More than half of the patients (52.1%) had pretreatment prostate-specific antigen (PSA) >20 ng/mL. The 5-year survival outcome of low-risk, intermediate-risk, and high-risk patients were: OS, 100%, 94.7%, and 67.9% (P=0.297); and BFS, 100%, 94.1%, and 57.1% (P=0.016), respectively. In the high-risk group, the 5-year OS was 88.3% in patients who received adjuvant hormonal androgen deprivation therapy (HT), compared to 53% in RT only, P=0.08. Significant predictors of OS include high-risk group (hazard Ratio [HR], 9.35; 95% confidence interval [CI], 1.52 to 57.6; P=0.016), adjuvant therapy (HR, 0.175; 95% CI, 0.05 to 0.58; P=0.005), detection by transurethral resection of the prostate (TUR-P) (HR, 6.81; 95% CI, 2.28 to 20.33; P=0.001), and pretreatment PSA (HR, 1.003; 95% CI, 1.00 to 1.005; P=0.039). The sole predictor of biochemical failure was pretreatment PSA (P=0.04), with odds ratio of 4.52 (95% CI, 1.61 to 12.65) for PSA >20 ng/mL.


CONCLUSIONS
RT is an effective treatment modality for localized or locally-advanced PCa in Indonesian patients, with outcomes and predictors consistent to that reported elsewhere. Predictors of poorer outcomes include high-risk group, higher pretreatment PSA, incidental detection by TUR-P, and lack of adjuvant HT. Adjuvant hormonal therapy significantly improve the survival of high risk patients.
Department of Urology, Cipto Mangunkusumo Hospital, University of Indonesia Faculty of Medicine, Jakarta, Indonesia.
Wempy
W
Supit
Chaidir Arif
CA
Mochtar
Rachmat Budi
RB
Santoso
Rainy
R
Umbas
Prostatic neoplasms; Radiotherapy; Survival