Fairly good results have already been obtained in the treatment of laryngeal cancer. The five year cure rate is approximately 70 percent. However, in the patients with Stage III or IV laryngeal carcinomas, nearly 75% of 5 year survivors have lost their larynx. In order to get better cure rate without sacrificing the larynx, it is necessary to detect carcinoma in its earlier stage. Mass screening will undoubtedly offer the best opportunity of earlier detection. But, because of low incidence of laryngeal cancer, mass screening must inevitably be limitted to some peoples who are thought to be high risk to laryngeal cancer. In our country, mass screenings for cancers of the lung, stomach, uterus and breast have already generally been carried out and are highly appreciated because many early carcinomas were detected, but the detection rates of these mass screenings are less than 0.2%.
If, the detection rate of mass screening were better than those of these cancers, the screening is thought to be "effective"
In this study, the "laryngeal cancer high risk group" was defined to those peoples who are older than 50 years and have horseness. Disease distribution, especially the incidence of laryn-geal cancer, in this high risk group was studied. This study was cooperated by 53 ENT doctors who work in their private clinics. All patients who visited these private clinics and belonged to high risk group were registered.
The number of registered patients amounted to 981. In these patients, 16 laryngeal carcinomas (1.7%) and 7 hypopharyngeal carcinomas (0.7%) were detected. This detection rate was far more excellent than I expected. This result may indicate the possibility to standardize the mass screening for laryngeal cancer. I conclude that the mass screening of laryngeal cancer is thought to be quite effective and practical method, if it is carried out for the high risk group.
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