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American Journal of Epidemiology Advance Access originally published online on November 9, 2005
American Journal of Epidemiology 2005 162(12):1174-1178; doi:10.1093/aje/kwi345
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American Journal of Epidemiology Copyright © 2005 by the Johns Hopkins Bloomberg School of Public Health All rights reserved; printed in U.S.A.

Original Contribution

Trends in the Incidence Rates of Nasopharyngeal Carcinoma among Chinese Americans Living in Los Angeles County and the San Francisco Metropolitan Area, 1992–2002

Li-Min Sun1,2, Meira Epplein1,2, Christopher I. Li1,2, Thomas L. Vaughan1,2 and Noel S. Weiss1,2

1 Division of Public Health Sciences, Fred Hutchinson Cancer Research Center, Seattle, WA
2 Department of Epidemiology, University of Washington, Seattle, WA

Reprint requests to Dr. Li-Min Sun, 1100 Fairview Avenue North, M4-C308, P.O. Box 19024, Seattle, WA 98109-1024 (e-mail: lsun{at}fhcrc.org).

Nasopharyngeal carcinoma is much more common in Asian countries than in Western countries. However, since the 1980s, nasopharyngeal carcinoma incidence has fallen among both men and women in Hong Kong, and recently a similar trend has also been noted in Singapore. Using data from the Surveillance, Epidemiology, and End Results Program and the US Census, the authors evaluated recent trends in the incidence rates of nasopharyngeal carcinoma among Chinese living in Los Angeles County and in the San Francisco-Oakland (California) metropolitan area. From 1992 to 2002, the rates of nasopharyngeal carcinoma in these two populations decreased in men by 37% (95% confidence interval: –54, –12) but in women by just 1% (95% confidence interval: –40, 64). In Chinese men, the overall decline in incidence was limited primarily to a decline in the rate of type I tumors (differentiated squamous tumors with keratin production). While the reasons underlying the observed patterns of incidence remain to be determined, changes in lifestyle and environment are likely to be contributory factors.

Asian continental ancestry group; incidence; nasopharyngeal neoplasms; trend

Abbreviations: CI, confidence interval; SEER, Surveillance, Epidemiology, and End Results


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