328 0 978-1 802 Clinical stage ≥ T3 1 416 1 109-1 808 De Nunzio 2

328 0.978-1.802 Clinical stage ≥ T3 1.416 1.109-1.808 De Nunzio 2011 [25] Italy Cross-section study Patients who underwent prostate biopsy for PSA > 4 ng/ml or abnormal DRE 69 2009-2011 NCEP-ATP-III 83 Gleason score ≥7 3.82 1.33-10.9 Clinical stage ≥ T3 NA NA click here Jeon 2012 [28] Korea Cross-section study Patients who underwent prostate biopsy for PSA > 4 ng/ml or abnormal DRE 68.86 ± 8.95 2003-2011 NCEP-ATP-III 90 Gleason score ≥7(4 + 3) 0.101 0.022-0.473 Clinical stage ≥ T3 NA NA Morote 2012 [26] Spain Cross-section study Patients who underwent prostate biopsy for PSA > 4 ng/ml or abnormal DRE 68(46-79) 2006-2010 NCEP-ATP-III

848 Gleason score >7 1.75 1.260-2.414 Clinical stage ≥ T3 NA NA Castillejos-Molina 2011 [23] Mexico Case-control study Patients with PC who underwent surgical treatment 64.8 ± 6.97 1990-2007 WHO 210 Biochemical TGF-beta inhibition recurrence 2.73 1.65-4.50 Post 2011 [27] United States Case-control study Patients

who underwent radical prostatectomy 60.9 1999- 2004 NCEP-ATP-III 383 Biochemical recurrence 1.5 0.90-2.6 Jaggers 2009 [30] United States Cohort study Aerobics Center Longitudinal Study 20-88 1977-2003 NCEP-ATP-III 185 Mortality 1.32 0.63-2.77 Martin 2009 [14] Norway Cohort study HUNT2 48 ± 16.4 1996-2005 NCEP-ATP-III 107 Mortality 0.81 0.52-1.25 Häggström 2012 [19] Norway Sweden Austria Cohort study Me-Can 44 NA Upper quartile Levels ATP-III criteria 961 Mortality 1.13 1.03-1.25 PCa = prostate cancer; RRs = Relative risks; CI = confidence

interval; WHO = World learn more Health Organization; NCEP-ATP-III = National Cholesterol Education Program Adult Treatment Panel III; IDF = International Diabetes Federation; HUNT 2 = Nord-Trondelang Health Study; NA = Not available; DRE = Digital rectal examination. Detailed search steps are described in Figure 1. Briefly, from the initial literature search we identified 547 abstracts. Twenty-three articles were considered of interest and full text of each article was retrieved for detailed evaluation. Eleven studies investigated the association between MetS and prostate cancer [11–21]. Nine of them were longitudinal cohort studies that reported the RRs of PCa in cancer-free population with and without MetS [7–15]. Seven studies evaluated MetS and pathological and clinical stages ADP ribosylation factor of PCa, of these studies, 7/7 investigate Gleason score [20, 23–26, 28, 29] and 4/7 investigated clinical stage [20, 23, 24, 29]. Two case-control studies explored biochemical recurrence after primary treatment [23, 27], and three longitudinal cohort studies focused on prostate cancer-specific mortality [14, 19, 30]. Figure 1 Selection of studies for meta-analysis. Main findings Prostate cancer risk Result from a meta-analysis based on nine longitudinal cohort studies revealed that there was no association between MetS and prostate cancer risk (RR = 0.96, 95% CI 0.85-1.09 n = 9 studies) (Figure 2). Figure 2 RR of prostate cancer risk for MetS presence.

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