[Primary malignant tumors in the lung and larynx --a report of 37 cases]

For the past 20 years (from May 1962 to December 1982) the cases of lung cancer and laryngeal cancer treated in National Cancer Center Hospital are 2423 and 603 respectively. We have studied multiple cases of the lung and laryngeal cancers. The cigarette smoking is one of the most important environmental factors concerning the multiple cases of laryngeal and lung cancer would not be so significant in the future, if the cigarette smoking factor should be excluded.