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Serum prostate-specific antigen (PSA) and prostate volume as a function of serum testosterone (T) in 4254 men with benign prostatic hyperplasia (BPH). Note that the curves for PSA level and prostate volume are flat, even for men with severe T deficiency, and are no different than those for men with T concentrations in the normal range (>300 ng/dl).Adapted from Marberger et al [44].
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