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  • Title: Prostate cancer outcomes of men with biopsy Gleason score 6 and 7 without cribriform or intraductal carcinoma.
    Author: Kweldam CF, Kümmerlin IP, Nieboer D, Verhoef EI, Steyerberg EW, Incrocci L, Bangma CH, van der Kwast TH, Roobol MJ, van Leenders GJ.
    Journal: Eur J Cancer; 2016 Oct; 66():26-33. PubMed ID: 27522247.
    Abstract:
    AIM OF THE STUDY: Gleason score (GS) 3 + 4 = 7 prostate cancer patients with presence of cribriform or intraductal carcinoma (7(+)) have a worse disease-specific survival than those without. The aim of this study was to compare the clinicopathologic characteristics and patient outcomes of men with biopsy GS 3 + 4 = 7 without cribriform or intraductal carcinoma (7(-)) to those with GS 3 + 3 = 6. MATERIALS AND METHODS: We included all patients from the first screening round of the European Randomized Study of Screening for Prostate Cancer (1993-2000) with a revised GS ≤ 3 + 4 = 7 (n = 796) following the 2014 International Society of Urological Pathology criteria. Relations with biochemical recurrence after radical prostatectomy or radiotherapy were analysed using log-rank testing and multivariable Cox regression analysis. RESULTS: In total, 486 patients had GS 6 and 310 had GS 7, 54 of whom had GS 7(+) (17%). During a median follow-up of 15 years, biochemical recurrence was seen in 61 (20%) GS 6, 54 (21%) GS 7(-) and 22 (41%) GS 7(+) patients (41%). Both biopsy GS 7(-) and 7(+) patients had significantly higher prostate-specific antigen levels, mean tumour percentage, percentage of positive cores and ≥cT3 than those with GS 6 (all P < .001). GS 7(-) patients did not have a poorer biochemical recurrence-free survival (BCRFS) after radical prostatectomy than GS 6 patients (log-rank P = .13), whereas those with GS 7(+) had (log-rank P = .05). In multivariable analyses, biopsy GS 7(-) was not associated with poorer BCRFS after radical prostatectomy (hazard ratio [HR], 1.3; 95% confidence interval [CI]: 0.67-2.4; P = .47) or radiotherapy (HR, 0.88; 95% CI: 0.51-1.5; P = .63). GS 7(+) was independently associated with poorer BCRFS after radical prostatectomy (HR, 3.0; 95% CI: 1.1-7.8; P = .03), but not after radiotherapy (HR, 1.2; 95% CI: 0.58-2.3; P = .67). CONCLUSIONS: Men with biopsy GS 7(-) prostate cancer have similar BCRFS after radical prostatectomy or radiotherapy to those with GS 6 and may be candidates for active surveillance as long as other inclusion criteria such as on PSA and tumour volume are met.
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