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We report on a retrospective comparison of biochemical outcomes using an ultra-high dose of conventionally fractionated intensity-modulated radiation therapy (IMRT) vs. a lower dose of IMRT combined with high-dose-rate (HDR) brachytherapy to increase the biologically effective dose of IMRT.
Patients received IMRT of 86.4Gy (n=470) or HDR brachytherapy (21Gy in three fractions) followed by IMRT of 50.4Gy (n=160). Prostate-specific antigen (PSA) relapse was defined as PSA nadir+2. Median followup was 53 months for IMRT alone and 47 months for HDR.
The 5-year actuarial PSA relapse-free survival (PRFS) for HDR plus IMRT vs. ultra-high-dose IMRT were 100% vs. 98%, 98% vs. 84%, and 93% vs. 71%, for National Comprehensive Cancer Network low- (p=0.71), intermediate- (p<0.001), and high-risk (p=0.23) groups, respectively. Treatment (p=0.0006), T stage (p<0.0001), Gleason score (p<0.0001), pretreatment PSA (p=0.0037), risk group (p<0.0001), and lack of androgen-deprivation therapy (p=0.0005) were significantly associated with improved PRFS on univariate analysis. HDR plus IMRT vs. ultra-high-dose IMRT (p=0.0012, hazard ratio [HR]=0.184); age (p=0.0222, HR=0.965); and risk group (p<0.0001, HR=2.683) were associated with improved PRFS on multivariate analysis.
Dose escalation of IMRT by adding HDR brachytherapy provided improved PRFS in the treatment of prostate cancer compared with ultra-high-dose IMRT, independent of risk group on multivariate analysis, with the most significant benefit for intermediate-risk patients.
Department of Radiation Oncology, Memorial Sloan-Kettering Cancer Center New York, New York, NY.
This article was published in the following journal.
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Comparison of two contact lens solutions.
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Comparison of various psychological, sociological, or cultural factors in order to assess the similarities or diversities occurring in two or more different cultures or societies.
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