Lack of association of microvessel density with prognosis of renal cell carcinoma: evidence from meta-analysis
To investigate microvessel density (MVD) and its association with prognosis of renal cell carcinoma (RCC) by means of a meta-analysis. We obtained published studies and extracted appropriate data, then did a meta-analysis to estimate the predictive role of MVD by combining estimated effect-size from individual studies. Analyses for overall survival (OS) and cancer-specific survival (CSS) were performed, separately. Subgroup analysis stratified by biomarkers were also performed for studies using CD34, factor VIII-related antigen (F VIII) and others, respectively. A total of 20 studies were included for meta-analyses including nine (four for F VIII, three for CD34, and two for others) for OS and 11 (two for F VIII, seven for CD34 and two for others) for CSS. There was no significance of MVD predicting OS or CSS of RCC. The pooled HR for OS was 0.910 (95 % CI 0.824–1.006; P = 0.065) and CSS was 0.977 (95 % CI: 0.915–1.043; P = 0.487). We failed to observe significant association between MVD and prognosis of RCC. Additional studies are needed to provide more precise evidences to support our results.
KeywordsRenal cell carcinoma Microvessel density Prognostic factors Survival
We thank all the authors of primary studies that are included in our meta-analyses.
Conflicts of interest
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