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Kaplan–Meier curves of cancer‐specific survival in prostate cancer patients for neopterin and kynurenine levels at biochemical recurrence (BCR). Cut‐offs for Kaplan–Meier analysis are based on the 3rd quartile of the observed distribution. Neopterin cut‐off = 15.7 nmol/L; kynurenine cut‐off = 5.5 μmol/L, log–rank test.
