NPM2 and vascular neoplasm: Univariate analysis showed that NPM2 protein expression level (negative vs. low expression vs. high expression) was negatively correlated with the following three clinicopathological factors: CC score (χ2 = 7.810, P = 0.020), vascular tumor emboli (χ2 = 10.927, P = 0.004), and SAEs (χ2 = 9.420, P = 0.009).