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  • Title: Malignant tumor formation at the site of previously irradiated acanthomatous epulides in four dogs.
    Author: Thrall DE, Goldschmidt MH, Biery DN.
    Journal: J Am Vet Med Assoc; 1981 Jan 15; 178(2):127-32. PubMed ID: 7204233.
    Abstract:
    The radiation response of acanthomatous epulis in 32 dogs was good, with an estimated median survival time of 21 months. Of the 32 patients, 14 have died. In 4 of those 14, malignant tumors developed at the site of the acanthomatous epulis. The tumors were of epithelial origin in 3 patients and of mesenchymal origin in 1 patient. Possibilities explaining the appearance of the malignancies included spontaneous malignant transformation, radiation induction of neoplasms, and radiation induction of malignant transformation. This uncommon complication was not considered contradictory to radiotherapy of acanthomatous epulides, because of their excellent response to irradiation and the long latent period between irradiation and appearance of the malignant tumor.
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