As shown in the forest plot (Figure 3A), because of the significant heterogeneity among the micrograms (I2 value was 64.7%), a random effect model analysis was performed, showing that the expression of DDX11 was higher tumour tissue than in non-tumour tissue (pooled standard mean difference (SMD)=0.83, 95% CI=(0.51-1.14), P=0.009). This evidence concerns the gene DDX11 and neoplasm.