Incidence rate for larynx cancer in Japanese in Japan and in the United States from the Cancer Incidence in Five Continents

In order to make a comparison of lung cancer incidence rates between Japanese in Japan and those in the United States, we abstracted the age-standardized incidence rates (ASRs) from the Cancer Incidence in Five Continents Vol. I–X (CI5). The International Agency for Research on Cancer provides the CI5 databases on the incidence of cancer recorded by cancer registries (regional and national) worldwide. We used ASRs for Japanese from the following cancer registries, Miyagi, Nagasaki and Osaka in Japan, and California-Los Angeles, California-San Francisco and Hawaii in the United States of America from the CI5 database. Furthermore, we referred the ASRs in the United States (SEER 9 registries and Hawaii). Year at cancer diagnosis were from 1959 to 2007 in Vol. I– X in CI5; however, the years were a little different from registries. Figure 1 shows the ASRs for larynx cancers coded as C32 (ICD10) for males. The ASRs of American people were consistently much higher than those of the other races during the observation period. However, the rates of the Americans have been decreasing after Vol. VI, and the difference from the rates of the other races has reduced in recent years. In the Americans, the Black population in SEER 9 had the highest ASRs, followed by Hawaii and the White population in SEER 9. There was no remarkable difference between the ASRs of Japanese in Japan and those of Japanese in the USA; however, the rates of Japanese in Japan were slightly higher than those in Japanese in the USA especially from Vol. VI to VIII.