Low dose rate brachytherapy with I 125 seeds has an excellent 5 year outcome with few side effects in patients with low risk prostate cancer
Abstract Background: Low dose rate brachytherapy (LDR BT) has been used in Sweden for more than a decade for treatment of low risk prostate cancer. This study presents the outcome for patients treated with LDR BT at a single institution with focus on the association between dose and biochemical failure free survival (BFFS) Methods: In total 195 patients were treated with LDR BT between 2004 and 2008. The patients were followed systematically for side effects for at least one year. PSA levels were followed regularly from three months and for at least five years. Outcome was analyzed in relation to clinical variables at baseline and to radiotherapy data. Results: Kaplan Meier estimated BFFS at five years was 95.7% Dose to the prostate in terms of D90% was significantly associated with BFFS [HR 0.90 (95%CI 0.83 0.96) p 0.002] Conclusion: Out data confirmed that absorbed dose is a predictive factor for BFFS for low risk patients without androgen deprivation therapy. With our treatment routines and dosimetry, a D90% in the range of 170 180 Gy gives excellent outcomes with acceptable toxicity for patients with low risk prostate cancer.
Acta oncologica