Evaluation of the independent contribution of each variable to Cox Proportional Hazard Model. Multivariate Survival Analysis using AFP mRNA and VEGF as an integrated variable.

AFP mRNA/VEGF (3 stages): stage 1 = − −, stage 2 = − + or + −, stage 3 = + +.AFP mRNA/VEGF (4 stages): stage 1 = − −, stage 2 = − +, stage 3 = + −, stage 4 = + +.甲胎蛋白信使核糖核酸（AFP mRNA）/血管内皮生长因子（Vascular Endothelial Growth Factor，VEGF）三分组：分期1为− −，分期2为− + 或 + −，分期3为+ +。甲胎蛋白信使核糖核酸/血管内皮生长因子四分组：分期1为− −，分期2为− +，分期3为+ −，分期4为+ +。