DD3PCA3 RNA analysis in urine--a new perspective for detecting prostate cancer

European Urology
Martina TinzlCamille Chypre

Abstract

Serum tPSA lacks specificity. The DD3(PCA3) gene is highly specific for prostate cancer and is detectable in prostate cancer cells shed into urine after rectal palpation. A newly developed nucleic acid sequence based amplification assay (uPM3) for detecting DD3(PCA3) RNA in urine samples was evaluated prospectively in patients referred for prostate cancer detection. The uPM3 assay simultaneously detects the relative expression of DD3(PCA3) RNA and PSAmRNA as a marker for prostate cells in urine. Urine samples were collected after attentive digital rectal palpation prior to transrectal guided prostate biopsy. Samples were provided as a single void specimen (20-30 ml), stabilized in phosphate buffer and centrifuged. Lysis was performed on cell pellets DD3(PCA3) RNA and PSAmRNA were extracted and amplification was performed using isothermic nucleic acid based amplification (NASBA). The two targets were detected in real-time using specific beacons as probes in a thermostated spectrofluorimeter. Parameters of the amplification curve were defined after a logistic curve fitting routine and a classification tree model was constructed to predict the outcome of patients (i.e. cancer and non-cancer). 201 patients were included in this pro...Continue Reading

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