KDR and neoplasm: Anti-tumor and antiangiogenic effects of berberine (50 mg/kg by oral gavage for 28 days)Decreasing the tumor weight (50 mg/kg by oral gavage for 28 days)Improving the survival rate of mice (50 mg/kg by oral gavage for 28 days)Inhibiting the phosphorylation of VEGFR2 and ERK