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ORIGINAL ARTICLE
Year : 2017  |  Volume : 33  |  Issue : 4  |  Page : 283-290

MicroRNA-21 could be a molecular marker to predict the recurrence of nonmuscle invasive bladder cancer


1 Department of Urology and Renal Transplantation, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
2 Department of Molecular Medicine and Biotechnology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
3 Department of Pathology, Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India
4 Department of Uro-oncology and Minimally Invasive Surgery, Fortis Escorts Kidney and Urology Institute, New Delhi, India

Correspondence Address:
Anil Mandhani
Department of Uro-oncology and Minimally Invasive Surgery, Fortis Escorts Kidney and Urology Institute, New Delhi
India
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Source of Support: This study was supported by intramural grant of Sanjay Gandhi Postgraduate Institute of Medical Sciences, Lucknow, Uttar Pradesh, India. Mitash N. was supported by a fellowship grant from Council of Scientific and Industrial Research, New Delhi, India., Conflict of Interest: There are no conflicts of interest.


DOI: 10.4103/iju.IJU_4_17

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Introduction: High relapse rate of nonmuscle invasive bladder cancer (NMIBC) is a major challenge. Overexpression of microRNA-21 (miR-21) which targets phosphatase and tensin homolog (PTEN), a gene associated with malignancy, has been reported in the bladder tumor tissue compared to normal mucosa by us and others. We have tested whether miR-21 levels in bladder mucosa could predict tumor recurrence. Methods: In a prospective cohort setting, tumor tissues and normal bladder mucosa (NBM) were taken from BC patients during transurethral resection of bladder tumor. Age- and ethnicity-matched NBM from benign prostate hyperplasia patients was taken as controls. The expression of miR-21 was analyzed using quantitative reverse transcription polymerase chain reaction. Patients were followed for 4 years for tumor reoccurrence. Postoperative recurrence were recorded and calculated by Kaplan–Meier curve. Results: In 31 patients, miR-21 was up-regulated (>4-fold, P = 0.003), and PTEN levels were significantly lower (<7-folds, P = 0.001) in tumor tissue relative to NBM. Moreover, the fold change in miR-21 levels was significantly higher (>3-folds, P = 0.03) in patients showing recurrence compared to those in which tumor did not recur. Further, Kaplan–Meier analysis shows overexpression of miR-21 corresponds to less time to recurrence with higher cumulative hazard. Conclusion: We found overexpression of miR-21 in tumor tissue and its association with recurrence, time to recurrence and invasiveness in BC. Quantification of miR-21 along with other pathological parameters could be more objective molecular approach to predict recurrence in NMIBC.


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