Abstract
PSA represents a very reliable marker in the evaluation of prostatic cancer patients. Particularly in those who have undergone radicai prostatectomy, finding dosable values of serum PSA, that theoretically shouldn't occur, must be regarded as the persistence, at least, of residuai prostatic tissue. An increase of such concentrations raises doubts of locai recurrence or metastatic disease. Every effort must be made to demonstrate this event as soon as possible in order to apply an adjuvant treatment. Non-disappearance of serum PSA at 3 months after surgery has to be inevitably considered as a lack of surgical radicality.
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