“…In total, there were four tissue OS studies (Chow et al, 1997;Jeng et al, 2004a;Deli et al, 2005;Sheen et al, 2005), six tissue DFS studies (Jeng et al, 2004a;Sheen et al, 2005;Guo et al, 2006;Wada et al, 2006;Zhang et al, 2006;Ho et al, 2007), seven serum OS studies (Poon et al, 2001(Poon et al, , 2004a(Poon et al, , b, 2007Chao et al, 2003;Kim et al, 2004;Jeng et al, 2004b;Treiber et al, 2006), and five serum DFS studies (Poon et al, 2001(Poon et al, , 2007Chao et al, 2003;Jeng et al, 2004b;Treiber et al, 2006). Pooled HRs were then calculated for all groups.…”