Prognostic Value of High CXCR4 Expression in Renal Cell Carcinoma: A System Review and Meta-Analysis

Table 1

Main characteristics and NOS score of each study included in meta-analysis.

First author	Year	Country	Study period	Median follow-up (year)	NOS score
An [2]	2014	China	1999–2006	TS: 5.2 (0.6–9.7); VS: 5.7 (0.7–9.8)	9
Li [20]	2013	France	1999–2005	6.6 (1.0–15.3)	8
D’Alterio [19]	2012	Italy	2005–2009	2.4	8
Wang [21]	2012	China	2002-2003	NA	7
Li [11]	2011	China	2001–2005	4.3 (0.2–8.3)	8
D’Alterio [17, 18]	2010	Italy	1999–2007	5.8	7
D’Alterio [17, 18]	2010	Italy	NA	5.3	8

TS: training set, VS: validation set, and NA: not available.