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Objective: The aim was to verify whether oxidative stress could represent a common key factor of benign prostatic hyperplasia (BPH) and prostate cancer (PCa)., Subjects and Methods: 15 patients affected by BPH, 15 with PCa and 15 controls were enrolled. Blood samples were withdrawn systemically and locally during radical retropubic prostatectomy in patients with PCa and during transvesical retropubic adenomectomy in patients diagnosed with BPH. Plasma oxidized low-density lipoprotein, peroxides, and total equivalent antioxidant capacity (TEAC) including plasma superoxide dismutase (SOD) determination were analyzed as oxidative markers., Results: With respect to the control group, high plasma peroxides and decreased TEAC levels were measured in patients affected by both PCa and BPH. Plasma peroxides were significantly higher in patients with PCa with respect to BPH. A positive correlation was found between peroxides and TEAC values in samples withdrawn locally in patients affected by PCa. An inverse correlation between peroxides and TEAC was observed in patients with BPH. No statistically significant modifications were observed as concerns SOD activity and LDL oxidability., Conclusions: Our findings confirm a significant unbalance of redox status in patients affected by BPH and PCa, and suggest a potential involvement of oxidative stress as a determinant in the pathogenesis of these diseases., (Copyright © 2010 S. Karger AG, Basel.)