KDR and non-small cell lung carcinoma: RZ suppresses in vivo angiogenesis mediated by NSCLC cells by inhibiting vascular endothelial growth factor A (VEGFA) and vascular endothelial growth factor receptor 2 (VEGFR2) phosphorylation through anti-programmed cell death 1/programmed cell death ligand 1(PD-1/PD-L1) signaling pathway inactivation.