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Retrospective Study |
From the Department of Diagnostic Imaging and Radiation Oncology (Poirier), Vetsuisse Faculty, University of Zurich, Wintherthurerstrasse 260, Zurich, 8057 Switzerland; the Departments of Medical Sciences (Poirier, Vail), Surgical Sciences (Adams, Forrest, Green), and Pathobiological Sciences (Dubielzig), School of Veterinary Medicine, University of Wisconsin-Madison; and the Comprehensive Cancer Center (Forrest, Vail) and MacEwen Center for Clinical Trials and Translational Research (Vail), University of Wisconsin-Madison, Madison, Wisconsin 53706.
Forty-five dogs with incompletely excised grade II mast cell tumors were treated with radiation using a cobalt 60 teletherapy unit (15 fractions of 3.2 Gy for a total of 48 Gy). Twenty-four of the dogs underwent prophylactic regional lymph node irradiation. Three (6.7%) dogs had tumor recurrence, two (4.4%) dogs developed metastasis, and 14 (31%) dogs developed a second cutaneous mast cell tumor. No difference in overall survival rate was observed between the dogs receiving and not receiving prophylactic irradiation of the regional lymph node.
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