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Purpose: Gleason score (GS) 10 disease is the most aggressive form of clinically localized prostate adenocarcinoma (PCa). The long-term clinical outcomes and overall prognosis of patients presenting with GS 10 PCa are largely unknown because of its rarity.
Methods And Materials: The study included 112 patients with biopsy-determined GS 10 PCa who received treatment with radical prostatectomy (RP, n = 26), external beam radiation therapy (EBRT, n = 48), or EBRT with a brachytherapy boost (EBRT-BT, n = 38) between 2000 and 2013. Propensity scores were included as covariates for comparative analysis. Overall survival, prostate cancer-specific survival, and distant metastasis-free survival (DMFS) were estimated by the Kaplan-Meier method with inverse probability of treatment weighting to control for confounding.
Results: The median follow-up period was 4.9 years overall (3.9 years for RP, 4.8 years for EBRT, and 5.7 years for EBRT-BT). Significantly more EBRT patients than EBRT-BT patients received upfront androgen deprivation therapy (98% vs 79%, P < .01 by χ test), though the durations were similar (median, 24 months vs 22.5 months). Of the RP patients, 34% received postoperative EBRT, and 35% received neoadjuvant systemic therapy. The propensity score-adjusted 5-year overall survival rate was 80% for the RP group, 73% for the EBRT group, and 83% for the EBRT-BT group. The corresponding adjusted 5-year prostate cancer-specific survival rates were 87%, 75%, and 94%, respectively. The EBRT-BT group trended toward superior DMFS when compared with the RP group (hazard ratio, 0.3; 95% confidence interval 0.1-1.06; P = .06) and had superior DMFS when compared with the EBRT group (hazard ratio, 0.4; 95% confidence interval 0.1-0.99; P = .048).
Conclusions: To our knowledge, this is the largest series ever reported on the clinical outcomes of patients with biopsy-determined GS 10 PCa. These data provide useful prognostic benchmark information for physicians and patients. Aggressive therapy with curative intent is warranted, as >50% of patients remain free of systemic disease 5 years after treatment.
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Source |
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http://dx.doi.org/10.1016/j.ijrobp.2018.03.060 | DOI Listing |
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