VEGFA and malignant colon neoplasm: Pearson correlation analysis showed that CDFI blood flow grade was significantly positively correlated with VEGF levels in the serum of patients (r > 0, P < 0.001), that is, the higher the level of VEGF, the higher the CDFI blood flow grade, the richer the tumor blood flow, and the greater the malignancy of colon cancer tumors.