[Biochemical monitoring of prostate cancer treated exclusively by radiotherapy: prognostic value of pretreatment PSA, PSA nadir and PSA half-life].

Objectives: Retrospective evaluation of the prognostic value of pretreatment PSA, PSA nadir and PSA half-life compared to grade and stage after treatment of prostate cancer by radiotherapy.

Patients And Methods: 122 patients (19 T1 (15.6%), 31 T2a (25.