KDR and thyroid gland undifferentiated (anaplastic) carcinoma: (76) synthesized mesoporous silica nanoparticles (MSNPs), radiolabeled with 131I and activated with anti-vascular endothelial growth factor receptor 2 (anti-VEGFR2) antibodies and bovine serum albumin (BSA) for the treatment of anaplastic thyroid cancers (APCs).