Controversies in using urine samples for Prostate Cancer detection: PSA and PCA3 expression analysis.
Int Braz J Urol
; 37(6): 719-26, 2011.
Article
em En
| MEDLINE
| ID: mdl-22234006
ABSTRACT
PURPOSE:
Prostate cancer (PCa) is one of the most commonly diagnosed malignancies in the world. Although PSA utilization as a serum marker has improved prostate cancer detection it still presents some limitations, mainly regarding its specificity. The expression of this marker, along with the detection of PCA3 mRNA in urine samples, has been suggested as a new approach for PCa detection. The goal of this work was to evaluate the efficacy of the urinary detection of PCA3 mRNA and PSA mRNA without performing the somewhat embarrassing prostate massage. It was also intended to optimize and implement a methodological protocol for this kind of sampling. MATERIALS ANDMETHODS:
Urine samples from 57 patients with suspected prostate disease were collected, without undergoing prostate massage. Increased serum PSA levels were confirmed by medical records review. RNA was extracted by different methods and a preamplification step was included in order to improve gene detection by Real-Time PCR.RESULTS:
An increase in RNA concentration with the use of TriPure Isolation Reagent. Despite this optimization, only 15.8% of the cases showed expression of PSA mRNA and only 3.8% of prostate cancer patients presented detectable levels of PCA3 mRNA. The use of a preamplification step revealed no improvement in the results obtained.CONCLUSION:
This work confirms that prostate massage is important before urine collection for gene expression analysis. Since PSA and PCA3 are prostate specific, it is necessary to promote the passage of cells from prostate to urinary tract, in order to detect these genetic markers in urine samples.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Neoplasias da Próstata
/
Regulação Neoplásica da Expressão Gênica
/
Antígeno Prostático Específico
/
Antígenos de Neoplasias
Tipo de estudo:
Diagnostic_studies
/
Guideline
Limite:
Aged
/
Humans
/
Male
Idioma:
En
Revista:
Int Braz J Urol
Assunto da revista:
UROLOGIA
Ano de publicação:
2011
Tipo de documento:
Article
País de afiliação:
Portugal