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The purpose of this study is to define the biologic activity of Palladia alone or in combination with radiation therapy for the treatment of nasal carcinoma.
Nasal tumors comprise approximately 1% of canine tumors and carcinomas are diagnosed in 60-70% of cases. Radiation therapy is the treatment of choice and is the only modality which has resulted in improvement of survival times. Reported survival times average 10-14 months following radiation therapy. The maximum tumor response is noted at approximately 3 months after completion of therapy and long term control rarely occurs. Both VEGF and VEGFR have been documented to be expressed in canine nasal carcinomas suggesting that inhibiting the VEGFR signaling axis may be therapeutically useful. This is supported by recent data presented at the 2010 Annual Veterinary Cancer Society Conference demonstrating clinical benefit in dogs with recurrent nasal carcinomas treated with the small molecule receptor tyrosine kinase inhibitor Palladia that inhibits signaling of VEGFR family members. One of the dogs experienced a complete response to therapy after failing radiation, suggesting that Palladia may have single agent activity against this disease. While there are no published data demonstrating the use of Palladia in combination with radiation, evidence from mouse models indicates that VEGFR inhibitors can act synergistically with radiation therapy without an increase in toxicity. Indeed, data presented at the VCS meeting demonstrated no enhanced toxicity when radiation was combined with Palladia for the treatment of mast cell tumors in dogs.
To qualify for enrollment in this study, dogs must:
Dogs with confirmed diagnosis of nasal carcinoma will receive Palladia every other day and depending on owner preference, will also receive radiation therapy (10 daily treatments over two weeks). Recheck exams will be performed at 1, 2, and 4 weeks after initiating Palladia, and then every 4 weeks thereafter for a total of 1 year. For those dogs that receive radiation therapy, a CT scan will be repeated by the Radiation Oncology Service at 3, 6, and 12 months following radiation treatment. For those dogs that do not receive radiation therapy, a CT scan will be performed at 3 months following therapy only.
The study will cover most of the recheck visits and tests (bloodwork, CT scans) performed after the Palladia therapy is initiated.
Owners are responsible for the costs of the radiation therapy. Owners are responsible for a small fraction of the costs for these recheck visits. Owners are responsible for any additional costs that arise from other medications, and the treatment of potential complications during the study.
Please contact the Clinical Trials Office (clinicaltrials [at] cvm [dot] osu [dot] edu) at the Veterinary Medical Center for more information about this study.