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Abstract
The environmental distribution of 51 canine patients with primary carcinoma of lungs and bronchi, 57 with carcinoma of nasal passages and paranasal sinuses and 57 with carcinoma of the tonsil was determined. A control group consisted of 74 dogs with neoplasms of the stomach and intestine. The environment was divided into urban and rural segments based on atmospheric pollution data and industrialization concentration around Philadelphia. No significant differences were noted in the patient distribution between urban and rural zones for cancer of the lungs and bronchi or nose and sinuses compared to patients with gastrointestinal neoplasia or total hospital population, A significant urban association was calculated for dogs with tonsillar carcinoma, 73.7% of which resided in the urban zone compared to 60.8% of the total population and 47.4% of dogs with gastrointestinal neoplasms.
