P2X7 receptor predicts postoperative cancer-specific survival of patients with clear-cell renal cell carcinoma.

Abstract

The P2X7 receptor, an ATP-gated plasma membrane ion channel, is involved in inflammation, apoptosis and cell proliferation, and thereby plays a crucial role during oncogenic transformation in various malignancies. This study aims to evaluate the impact of P2X7 receptor expression on postoperative cancer-specific survival of patients with clear-cell renal cell carcinoma (ccRCC). A total of 273 patients with ccRCC undergoing nephrectomy at a single institution were retrospectively enrolled in this study, among which 86 patients died of this disease and six patients died of other causes. Clinicopathologic features and cancer-specific survival (CSS) were recorded. P2X7 expression was assessed by immunohistochemistry in clinical specimens. Kaplan-Meier method with log rank test was performed to compare survival curves. Cox regression models were used to evaluate the prognostic values of variables on CSS. Concordance index was calculated to assess prognostic accuracy of prognostic models. Median follow-up period was 90 months (range, 11-120 months). Intratumoral P2X7 expression was significantly lower than peritumoral tissues (P < 0.001). Moreover, high intratumoral P2X7 expression, which was significantly associated with shorten CSS (P < 0.001), high TNM stage (P = 0.038), Fuhrman grade (P = 0.035), SSIGN (stage, size, grade, and necrosis) score (P = 0.021) and University of California Integrated Staging System (UISS) score (P = 0.007), was indicated to be an independent prognostic factor for CSS (hazard ratio [HR], 1.693; P = 0.034). The prognostic accuracy of TNM stage, UISS and SSIGN scoring models was improved when intratumoral P2X7 expression was added. Intratumoral P2X7 expression is a potential independent adverse prognostic indicator for postoperative CSS of patients with ccRCC.

• Authors: Zheng Liu, Yidong Liu, Le Xu, Huimin An, Yuan Chang, Yuanfeng Yang, Weijuan Zhang, Jiejie Xu
• Journal: Cancer science (Cancer Sci) Vol. 106 Issue 9 Pg. 1224-31 (Sep 2015) ISSN: 1349-7006 [Electronic] England
• PMID: 26179886 (Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
• Copyright: © 2015 The Authors. Cancer Science published by Wiley Publishing Asia Pty Ltd on behalf of Japanese Cancer Association.

Chemical References

• P2RX7 protein, human
• Receptors, Purinergic P2X7

Topics

• Carcinoma, Renal Cell (metabolism, mortality, pathology)
• Female
• Humans
• Immunohistochemistry (methods)
• Kaplan-Meier Estimate
• Kidney Neoplasms (metabolism, mortality, pathology)
• Male
• Middle Aged
• Neoplasm Staging (methods)
• Nephrectomy (methods)
• Postoperative Period
• Prognosis
• Receptors, Purinergic P2X7 (metabolism)
• Retrospective Studies