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Circulating prostate cells can be detected in peripheral blood of patients with clinically localized or advanced prostate carcinoma. Traditionally, nested reverse transcriptase-polymerase chain reaction (RT-PCR) is used for this as a sensitive, but qualitative only, detection system. We developed a quantitative real-time RT-PCR method for measuring prostate-specific antigen (PSA) mRNA in peripheral blood of prostate cancer patients. A quantitative assay was developed using an external standard reference curve generated with RNA from the human prostate cell line LNCaP. Basal blood samples were collected from 44 patients without evidence of distant metastases and from 30 healthy controls. In 29 patients surgically treated with radical prostatectomy, the measurement of PSA mRNA was performed in blood samples collected before, at the end and 6 days after surgery. In 14 patients treated with radiotherapy, the measurements were repeated at 3-month intervals to evaluate time-related changes during therapy. The measurements were also performed for one year at 3-month intervals in one patient treated with anti-androgen therapy.

clinical chemistry and laboratory medicine

Real-Time Quantitative Reverse Transcriptase-Polymerase Chain Reaction (RT-PCR) for the Measurement of Prostate-Specific Antigen mRNA in the Peripheral Blood of Patients with Prostate Carcinoma Using the TaqManTM Detection System