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OPSAD of PCA is elevated with the rise of Gleason score. Gleason score 6 was 0.92 ± 0.24 ng/ml2; Gleason score 7 was 2.37 ± 1.90 ng/ml2; Gleason score 8 was 3.41 ± 0.35 ng/ml2. The ANOVA test showed that the difference of OPSAD among the groups with Gleason score 6, 7 and 8 (F = 57.53, P < 0.05). *PCA, prostate cancer; OPSAD, the ratio of prostate specific antigen to the outer gland volume of prostrate.
