title: Differential response of primary tumor versus lymphatic metastasis to VEGFR-2 and VEGFR-3 kinase inhibitors cediranib and vandetanib.
abstract: Blood vessels are required for a tumor to grow and functional lymphatic vessels are required for it to disseminate to lymph nodes. In an attempt to eradicate both the primary tumor and its lymphatic metastasis, we targeted both blood and lymphatic vessels using two different tyrosine kinase inhibitors (TKIs): cediranib and vandetanib, which block vascular endothelial growth factor receptor (VEGFR)-2 and -3 in enzymatic assays. We found that although both cediranib and vandetanib slowed the growth rate of primary tumors and reduced blood vessel density, neither agent was able to prevent lymphatic metastasis when given after tumor cells had seeded the lymph node. However, when given during tumor growth, cediranib reduced the diameters of the draining lymphatic vessels, the number of tumor cells arriving in the draining lymph node, and the incidence of lymphatic metastasis. On the other hand, vandetanib had minimal effect on any of these variables, suggesting that vandetanib did not effectively block VEGFR-3 on lymphatic endothelial cells in our animal model. Collectively, these data indicate that the response of lymphatic vessels to a TKI can determine the incidence of lymphatic metastasis, independent of the effect of the TKI on blood vessels.
authors.affiliation: Edwin L. Steele Laboratory for Tumor Biology, Department of Radiation Oncology, Massachusetts General Hospital and Harvard Medical School, 100 Blossom Street, Boston, MA 02114, USA.
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Padera
authors.forename: Angera H
authors.initials: AH
authors.lastname: Kuo
authors.forename: Tohru
authors.initials: T
authors.lastname: Hoshida
authors.forename: Shan
authors.initials: S
authors.lastname: Liao
authors.forename: Jennifer
authors.initials: J
authors.lastname: Lobo
authors.forename: Kevin R
authors.initials: KR
authors.lastname: Kozak
authors.forename: Dai
authors.initials: D
authors.lastname: Fukumura
authors.forename: Rakesh K
authors.initials: RK
authors.lastname: Jain
mesh_terms: D000818:Animals; D001483:Base Sequence; D045744:Cell Line, Tumor; D017931:DNA Primers; D008207:Lymphatic Metastasis; D051379:Mice; D010880:Piperidines / Q000494:pharmacology*; D047428:Protein Kinase Inhibitors / Q000494:pharmacology*; D011799:Quinazolines / Q000494:pharmacology*; D040301:Vascular Endothelial Growth Factor Receptor-2 / Q000037:antagonists & inhibitors*; D040321:Vascular Endothelial Growth Factor Receptor-3 / Q000037:antagonists & inhibitors*; D007211:Indoles
chemical_list: D017931:DNA Primers; D010880:Piperidines; D047428:Protein Kinase Inhibitors; D011799:Quinazolines; D040301:Vascular Endothelial Growth Factor Receptor-2; D040321:Vascular Endothelial Growth Factor Receptor-3; C500926:cediranib; D007211:Indoles; C452423:vandetanib