抄録
The mortality of pharyngeal cancer in Japan was statistically examined. The study was based on mortality registration in Japan for the past ten years. The findings are as follows: 1) The mortality of pharyngeal cancer, compared to head and neck cancer, and cancer in general was extremely low. 2) The age adjusted mortality rate per 100,000 people was 0.166 in men and 0.062 in women in nasopharyngeal cancer; 0.110 for men, and 0.023 for women in mesopharyngeal cancer; and 0.181 and 0.065 for men and women, respectively in hypopharyngeal cancer. 3) Pharyngeal cancer tended to increase with age. The rate of hypopharyngeal cancer was particularly higher. 4) The sex ratio for pharyngeal cancer mortality was as follows: Nasopharyngeal cancer: 2.6, Mesopharyngeal cancer: 4.5, Hypopharyngeal cancer: 2.8, Unspecified pharyngeal cancer: 3.5. For each type of pharyngeal cancer, mortality rates were higher for men than women. 5) The highest incidences of nasopharyngeal cancer were observed in cases in their sixties. However, for both mesopharyngeal and hypopharyngeal cancer the highest incidences were found in still older age groups.
