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B7-H3 is a new cancer-specific endothelial marker in clear cell renal cell carcinoma

Authors Qin XJ, Zhang HL, Ye DW, Dai B, Zhu Y, Shi GH

Received 26 August 2013

Accepted for publication 4 October 2013

Published 15 November 2013 Volume 2013:6 Pages 1667—1673

DOI https://doi.org/10.2147/OTT.S53565

Checked for plagiarism Yes

Review by Single-blind

Peer reviewer comments 5

Xiaojian Qin,1,2 Hailiang Zhang,1,2 Dingwei Ye,1,2 Bo Dai,1,2 Yao Zhu,1,2 Guohai Shi1,2

1Department of Urology, Fudan University Shanghai Cancer Center, Shanghai, People's Republic of China; 2Department of Oncology, Fudan University Shanghai Medical College, Shanghai, People's Republic of China

Background: The purpose of this study was to validate B7-H3 as a new cancer-specific endothelial marker in clear cell renal cell carcinoma.
Methods: B7-H3 expression patterns were compared between cancer and paired adjacent normal renal parenchyma by immunohistochemistry in paraffin-embedded specimens from 200 consecutive patients with clear cell renal cell carcinoma from January to December 2010. Four corpus luteum specimens were used as physiologic angiogenesis controls. B7-H3 messenger (m)RNA levels representing circulating endothelial cells were analyzed in 24 peripheral blood samples using real-time polymerase chain reaction. Collection and processing of tissue and peripheral blood samples was performed in compliance with the Declaration of Helsinki.
Results: Cancer cell-specific expression of B7-H3 was detected in 19% of clear cell renal cell carcinoma specimens, and tumor vasculature B7-H3 expression was confirmed in 98% (196) of cases. A diffuse pattern of vascular B7-H3 expression was associated with multiple adverse clinical and pathologic features (P<0.001). B7-H3 expression was not detected in paired adjacent normal renal parenchyma or vessels, or in luteal blood vessels. The B7-H3 mRNA level of circulating endothelial cells in peripheral blood was significantly higher in metastatic clear cell renal cell carcinoma (P<0.001).
Conclusion: This pilot study indicates that B7-H3 is a cancer-specific endothelial marker of potential importance for the development of tumor-specific, vascular-targeted therapies, and is a prognostic marker in clear cell renal cell carcinoma.

Keywords: B7-H3, biomarkers, clear cell renal cell carcinoma, endothelial cell, kidney

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