Down-regulated microRNA-101 in bladder transitional cell carcinoma is associated with poor prognosis
Huihui Zhang, Fan Qi, Youhan Cao, Minfeng Chen, Xiongbing Zu
Department of Urology, The First Affiliated Hospital of University of South China, Hengyang, China (mainland)
Med Sci Monit 2014; 20:812-817
Down-regulation of microRNA-101 (miR-101) expression has been linked to bladder transitional cell carcinoma (BTCC) development. However, the relationship between the expression of miR-101 in BTCC and a patient’s prognosis has not yet been studied. Thus, we attempted to explore the correlation of miR-101 and clinicopathological factors of BTCC patients, and evaluate the impact of miR-101 on prognosis of BTCC.
Material and Methods: In 88 samples of BTCC (n=72) and normal tissues (n=16), the expressions of miR-101 were detected by quantitative reverse-transcriptase polymerase chain reaction (qRT-PCR). The relationship of miR-101 and clinicopathological factors in BTCC was analyzed statistically. Survival analysis was performed to assess the prognostic significance of miR-101.
Results: Down-regulation of miR-101 was found in BTCC tissues, compared with normal tissues (P<0.05). MiR-101 expression was significantly associated with tumor diameter, tumor stage, tumor grade, lymph node involvement, and lymph node metastasis (all P<0.05). Low-level expression of miR-101 was significantly correlated with shortened survival time (P<0.01). Multivariate Cox regression analysis revealed this significant prognostic impact was independent of other clinicopathologic factors (P<0.01).
Conclusions: Our results suggest that the expression of miR-101 is down-regulated in BTCC, which consequently favored tumor progression. MiR-101 may play an important role as a diagnostic and prognostic marker in BTCC.
Keywords: Urinary Bladder Neoplasms, Adult, Aged, 80 and over, Carcinoma, Transitional Cell - surgery, Down-Regulation - genetics, Gene Expression Regulation, Neoplastic, Kaplan-Meier Estimate, MicroRNAs - metabolism, Multivariate Analysis, Prognosis, Urinary Bladder - pathology, Urinary Bladder Neoplasms - surgery