NRP-1 expression in bladder cancer and its implications for tumor progression
- 246 Downloads
Neuropilin-1 (NRP-1) overexpression has been reported in a variety of human cancers. However, the role of NRP-1 in bladder cancer (BC) remains unclear. The aim of present study was to analyze NRP-1 protein expression in BC tissues and to assess its prognostic significance for BC. NRP-1 messenger ribonucleic acid (mRNA) and protein expression were determined by real-time quantitative reverse transcriptase-polymerase chain reaction (qRT-PCR) and immunohistochemistry in specimens of primary cancer and their adjacent noncancerous tissues in BC patients. Additionally, NRP-1 protein expression in 139 archived paraffin-embedded BC samples was analyzed by immunohistochemistry and correlated with clinicopathological characteristics and survival. Student’s t test, Spearman’s rank correlation, Kaplan-Meier plots, and Cox’s proportional hazards regression model were used to analyze the data. By qRT-PCR and immunohistochemistry, the levels of NRP-1 mRNA and protein were significantly higher in BC, compared to that in adjacent noncancerous tissues (P < 0.001). High expression of NRP-1 was significantly associated with histologic grade (P = 0.016) and tumor stage (P = 0.001). Multivariate analysis showed that high expression of NRP-1 was an independent prognostic factor for overall survival. Our study suggests that overexpression of NRP-1 may play an important role in the progression of BC, and NRP-1 expression may serve as a biomarker for poor prognosis for BC.
KeywordsNeuropilin-1 Bladder cancer Prognosis
This work was also supported by the National Natural Science Foundation of China (No. 30772278 and No. 30973443).
Conflicts of interest
- 11.Kawakami T, Tokunaga T, Hatanaka H, Kijima H, Yamazaki H, Abe Y, et al. Neuropilin 1 and neuropilin 2 co-expression is significantly correlated with increased vascularity and poor prognosis in nonsmall cell lung carcinoma. Cancer. 2002;95:2196–201. doi: 10.1002/cncr.10936.CrossRefPubMedGoogle Scholar
- 20.Tomizawa Y, Sekido Y, Kondo M, Gao B, Yokota J, Roche J, et al. Inhibition of lung cancer cell growth and induction of apoptosis after reexpression of 3p21.3 Candidate tumor suppressor gene SEMA3B. Proc Natl Acad Sci U S A. 2001;98:13954–9. doi: 10.1073/pnas.231490898.PubMedCentralCrossRefPubMedGoogle Scholar