Abstract | PURPOSE: EXPERIMENTAL DESIGN: RESULTS: In MCF7 AROM 1 tumors, all treatments induced growth suppression and were associated with a reduction in cell turnover index, a composite measurement of both proliferation and apoptosis. PTK/ZK significantly reduced vessel density. Whereas letrozole caused tumor regression, PTK/ZK stabilized tumor volumes. The growth suppressive and antiangiogenic effects of PTK/ZK were confirmed in BT474 AROM xenografts. The addition of PTK/ZK did not enhance the growth-suppressive effects of letrozole. However, PTK/ZK decreased progesterone receptor (PgR) and TFF1 expression and uterine weight, indicating that PTK/ZK decreases 17beta-estradiol (E2) signaling in vivo. CONCLUSION: The VEGF receptor inhibitor PTK/ZK showed effects on E2-dependent gene expression consistent with aromatase inhibition as well as antiangiogenesis in xenograft models of breast cancer. The combination with letrozole was not superior to letrozole alone. Overall, these results provide further support for a potential therapeutic approach of dual inhibition of VEGF and E2 signaling using a single agent.
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Authors | Susana Banerjee, Roger A'Hern, Simone Detre, Amanda J Littlewood-Evans, Dean B Evans, Mitchell Dowsett, Lesley-Ann Martin |
Journal | Clinical cancer research : an official journal of the American Association for Cancer Research
(Clin Cancer Res)
Vol. 16
Issue 16
Pg. 4178-87
(Aug 15 2010)
ISSN: 1557-3265 [Electronic] United States |
PMID | 20682704
(Publication Type: Journal Article, Research Support, Non-U.S. Gov't)
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Chemical References |
- Angiogenesis Inhibitors
- Antineoplastic Agents
- Aromatase Inhibitors
- Nitriles
- Phthalazines
- Pyridines
- Receptors, Estrogen
- Triazoles
- vatalanib
- Letrozole
- Aromatase
- Receptors, Vascular Endothelial Growth Factor
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Topics |
- Angiogenesis Inhibitors
(pharmacology)
- Animals
- Antineoplastic Agents
(pharmacology)
- Apoptosis
(drug effects)
- Aromatase
(metabolism)
- Aromatase Inhibitors
(pharmacology)
- Cell Line, Tumor
- Cell Proliferation
(drug effects)
- Female
- Humans
- Immunohistochemistry
- Letrozole
- Mammary Neoplasms, Experimental
(drug therapy, metabolism)
- Mice
- Mice, Nude
- Neovascularization, Pathologic
(drug therapy)
- Nitriles
(pharmacology)
- Phthalazines
(pharmacology)
- Pyridines
(pharmacology)
- Receptors, Estrogen
(biosynthesis)
- Receptors, Vascular Endothelial Growth Factor
(antagonists & inhibitors)
- Signal Transduction
(drug effects)
- Triazoles
(pharmacology)
- Xenograft Model Antitumor Assays
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