High-dose-rate brachytherapy combined with long-term hormonal therapy for high-risk prostate cancer: results of a retrospective analysis

Purpose High-dose-rate (HDR) brachytherapy combined with hormonal therapy (HTx), without the addition of external beam radiation therapy (EBRT) for high-risk prostate cancer was evaluated retrospectively. Materials and Methods Between May 1995 and April 2002, 35 patients with prostate cancer [Stage≥T2b (UICC 1997) or tumor grading=3 or prostate-specific antigen (PSA) level≥20 ng/mL] were treated with HDR brachytherapy combined with HTx. Most patients (74%) had two or more of these factors. All patients received Iridium-192 HDR brachytherapy with a total dose of 54 Gy/9 fractions/5 days (48 Gy/8 fractions/5 days for the first 6 cases) in one implant session. The median neoadjuvant HTx [luteinizing hormone-releasing hormone (LH-RH) agonist and antiandrogen] period was 7 months. The median adjuvant HTx (ATH) (LH-RH agonist) period was 40 months, and median follow-up was 57 months (range, 23–117 months). Results The 5-year actuarial biochemical control, local control, and disease-free rates were 62%, 96%, and 76% respectively. No patients experienced local and/or regional relapse without distant progression. The 5-year actuarial cause-specific survival and overall survival rates were 89% and 87%, respectively. The acute and late toxicity were moderate and well tolerated. Conclusion HDR brachytherapy plus long-term HTx is at least as effective as conventional EBRT plus long-term HTx.