Chemodectomas in Dogs: Epidemiologic Comparisons With Man2

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Abstract
Fifty dogs with a confirmed diagnosis of chemodectoma were identified at 11 veterinary school clinic-hospitals. As in man, some evidence was found of genetic determinants: 2 brachycephalic breeds (Boston terriers and boxers) had a significantly greater risk compared to all other purebred dogs combined. An excessive risk was detected in males, though it was not statistically significant, and in older dogs. There was a significantly high frequency of 4 concurrent tumors (seminoma and interstitial-cell tumors of the testis, adenomatous thyroid neoplasms, and hemangiomas); but in man, with chemodectoma, the reported tendency to multiple primary tumors has been confined to the chemoreceptor system. The etiologic role of chronic hypoxia, suggested by the high incidence of carotid body tumors among Peruvians in the Andes, may be clarified by further studies of chemodectoma in brachycephalic breeds.

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