Presented in oral abstract format at the annual American College of Veterinary Radiology meeting, August 15–19, 2010; Asheville, NC.
PRELIMINARY EVALUATION OF SERIAL 18FDG-PET/CT TO ASSESS RESPONSE TO TOCERANIB PHOSPHATE THERAPY IN CANINE CANCER
Article first published online: 24 FEB 2012
© 2012 Veterinary Radiology & Ultrasound
Veterinary Radiology & Ultrasound
Volume 53, Issue 3, pages 348–357, May/June 2012
How to Cite
LeBlanc, A. K., Miller, A. N., Galyon, G. D., Moyers, T. D., Long, M. J., Stuckey, A. C., Wall, J. S. and Morandi, F. (2012), PRELIMINARY EVALUATION OF SERIAL 18FDG-PET/CT TO ASSESS RESPONSE TO TOCERANIB PHOSPHATE THERAPY IN CANINE CANCER. Veterinary Radiology & Ultrasound, 53: 348–357. doi: 10.1111/j.1740-8261.2012.01925.x
- Issue published online: 16 MAY 2012
- Article first published online: 24 FEB 2012
- Manuscript Accepted: 9 JAN 2012
- Manuscript Received: 25 AUG 2011
- toceranib cancer
PalladiaTM (toceranib phosphate—Pfizer Animal Health) is a novel orally administered receptor tyrosine kinase inhibitor (TKI) approved for treatment of canine mast cell tumors. Receptor tyrosine kinase dysregulation leads to tumor growth, progression, and metastasis. Toceranib's targets include vascular endothelial growth factor receptor (VEGFR-2/Flk-1/KDR), platelet-derived growth factor receptor, and kit. Positron Emission Tomography/Computed Tomography (PET/CT) is used commonly to diagnose, prognosticate, and monitor response to antineoplastic therapy in human patients. In this study, serial PET/CT imaging with 18F-fluorodeoxyglucose (18FDG) was used to assess response to toceranib therapy in dogs with measurable solid malignancies. Six tumor-bearing dogs underwent tumor assessment using both standard RECIST criteria and PET/CT prior to and at a median of 5 weeks postinitiation of toceranib treatment. Toceranib was prescribed initially at a target dose 3.25 mg/kg PO q48 h, with subsequent modifications based on observed toxicity. Treatment was continued in patients achieving stable disease with acceptable drug tolerance. One dog was maintained on drug despite dose modification due to toxicity; measurable clinical and image-based responses were seen after 10 weeks of therapy. All others had stable or progressive disease based on clinical restaging and PET/CT at first recheck. . Due to discordance with anatomic and metabolic imaging, further studies are needed to investigate the role of molecular imaging in assessment of drug response and identify other potential molecular targets of toceranib.