“…After reviewing the full text, 3 literatures were excluded, of which the data of two studies were inestimable and the authors were unreachable (Braun et al, 2008;Lamas et al, 2011), and patients in another additional study were treated with radiotherapy (Fakih et al, 2008). As a result, a total of 2846 CRC patients were enrolled in the 22 studies (Stoehlmacher et al, 2004;Viguier et al, 2005;Ruzzo et al, 2007;Liang et al, 2008;Martinez-Balibrea et al, 2008;Pare et al, 2008;Chang et al, 2009;Chua et al, 2009;Boige et al, 2010;Chen et al, 2010;Inada et al, 2010;Liang et al, 2010;Spindler et al, 2010;Farina Sarasqueta et al, 2011;Huang et al, 2011;Chai et al, 2012;Li et al, 2012;Cortejoso et al, 2013;Kumamoto et al, 2013;Lee et al, 2013;Nishina et al, 2013;Oguri et al, 2013) included in the pool-analysis. The selection procedure is shown in Figure 1 and the key patient characteristics are listed by study in Table1.…”