Abstract
Purpose
Since cytology as the current “gold standard” for noninvasive detection of bladder cancer (BCa) is characterized by a relatively low sensitivity, urinary transcript levels of survivin (SVV), Ki-67 and cytokeratin 20 (CK20) were evaluated as alternative or complementary biomarkers. Furthermore, their prognostic value was investigated.
Methods
Voided urine samples from 105 BCa patients and 156 controls were included. Total RNA was isolated from urine pellets and reverse-transcribed into cDNA. Expression levels of SVV, Ki-67 and CK20 were determined by quantitative PCR and normalized to the housekeeping gene TBP. Diagnostic performance of transcript markers and cytology was assessed by receiver operating characteristic (ROC) curve analyses. The prognostic value of the transcript markers was calculated by Cox proportional hazards models.
Results
ROC analyses resulted in AUC values between 0.71 (Ki-67) and 0.86 (CK20), indicating an appropriate diagnostic power. Using specifically defined cutoff values, the expression levels of the assessed biomarkers were significantly higher in urine specimens from BCa patients compared to control group (Mann–Whitney U test p < 0.001). Specificity ranged from 75 % (SVV) to 84 % (CK20) and sensitivity from 56 % (Ki-67) to 87 % (CK20). In combination with cytology, the sensitivity increased up to 97 % (CK20). With regard to prognostic power, only SVV showed a significant, but not independent impact on the risk of recurrence (p = 0.008).
Conclusions
Quantitative assessment of tumor-related transcript markers, particularly of CK20, may serve as a noninvasive method to identify patients with BCa. Moreover, SVV appears to be useful as a marker for a high risk of recurrence.
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All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki Declaration and its later amendments or comparable ethical standards.
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Juliane Schmidt and Catharina Propping have contributed equally to this work.
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Schmidt, J., Propping, C., Siow, WY. et al. Diagnostic and prognostic value of bladder cancer-related transcript markers in urine. J Cancer Res Clin Oncol 142, 401–414 (2016). https://doi.org/10.1007/s00432-015-2037-8
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DOI: https://doi.org/10.1007/s00432-015-2037-8