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Preclinical evaluation of sunitinib as single agent or in combination with chemotherapy in nasopharyngeal carcinoma

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Summary

Purpose: Sunitinib is a multi-target receptor tyrosine kinase (RTK) inhibitor against vascular endothelial growth factor receptors, platelet-derived growth factor receptors (PDGFR), c-kit and RET. Several of these RTKs are known to be involved in the progression of nasopharyngeal carcinoma (NPC). Here, we evaluated the preclinical activities of sunitinib in NPC. Method: We determined the basal level of total and phosphorylated PDGFR, c-kit and RET by immunoblotting in a panel of five NPC cell lines. The effect of sunitinib on NPC cell proliferation was evaluated by MTT assay. We further studied the effect of sunitinib on NPC cell cycle progression and apoptosis. We investigated the in vitro and in vivo activities of sunitinib as single agent and in combination with cisplatin or docetaxel in NPC cell lines and tumor xenografts. Results: Sunitinib exhibited dose-dependent growth inhibition in all NPC cell lines tested with IC50 between 2–7.5 μM and maximum inhibition of over 97%. Sunitinib induced apoptosis and cell cycle arrest at G0/G1 phase. In vitro, sunitinib moderately enhanced the growth inhibition of cisplatin or docetaxel. Single agent sunitinib demonstrated significant growth inhibition, reduced microvessel density and caused extensive tumor necrosis in a NPC xenograft model. However, concurrent administration of sunitinib and docetaxel induced severe toxicity in mice without enhanced antitumor effect. Conclusions: Single agent sunitinib demonstrated potent in vitro and in vivo growth inhibition in NPC. When combined with chemotherapy, sequential instead of concurrent administration schedule should be further explored.

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Acknowledgement

Supported by research fund from Li Ka Shing Institute of Health Sciences to Cancer Drug Testing Unit, Department of Clinical Oncology, The Chinese University of Hong Kong.

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Correspondence to Anthony T. C. Chan.

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Edwin P. Hui and Vivian W. Y. Lui co-first authors.

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Hui, E.P., Lui, V.W.Y., Wong, C.S.C. et al. Preclinical evaluation of sunitinib as single agent or in combination with chemotherapy in nasopharyngeal carcinoma. Invest New Drugs 29, 1123–1131 (2011). https://doi.org/10.1007/s10637-010-9451-1

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  • DOI: https://doi.org/10.1007/s10637-010-9451-1

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