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Kaplan-Meier estimate of biochemical no evidence of disease rate in 196 patients who reached a prostate-specific antigen (PSA) level of ≤ 0.02 ng/ml. Patients were divided into 2 groups according to how long it took to achieve that level: ≤ 1 year after radiotherapy (n = 171) and > 1 year after radiotherapy (n = 25)
