Abstract
Objective
To describe and compare the epidemiology of thyroid cancer in the rapidly growing Middle Eastern (ME) population and the non-Hispanic, non-Middle Eastern White (NHNMW) residents of California. Population with ME heritage that is officially not recognized as a distinct ethnicity has rarely been studied in the past.
Methods
ME cases in the California cancer registry files for 1988–2004 were identified by surname recognition. ME population was estimated by ancestry from census data.
Results
Thyroid cancer in ME group, 869 cases and 56 deaths were compared with 19,182 cases and 1,327 deaths in the NHNMW population. Age-adjusted rate ratio (RR) for incidence was 1.5 (95% CI 1.3–1.7) in men and 1.5 (95% CI 1.4–1.7) in women. RR for mortality was 1.4 (95% CI 0.9–2.4) in men and 2.3 (95% CI 1.4–3.9) in women. Papillary tumors comprised over 80% of all cases and their pattern correlated with the rapid increase in thyroid cancer in recent years. Five-year observed survival in ME men was significantly higher than in NHNMW men, but similar in women.
Conclusions
Eighty-five percent of ME cases identified in this study were born in the Middle East. The higher incidence of thyroid cancer in this immigrant population may largely reflect a combination of sequels of radiation treatment for fungal diseases of the scalp that was common in the area in early 1950s, benign proliferative thyroid disease that is common in the area due to dietary iodine imbalance, and possibly genetic predisposition.
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Acknowledgment
The collection of cancer incidence data used in this study was supported by the California Department of Public Health as part of the statewide cancer reporting program mandated by California Health and Safety Code Section 103885; the National Cancer Institute’s Surveillance, Epidemiology and End Results Program under contract N01-PC-35136 awarded to the Northern California Cancer Center, contract N01-PC-35139 awarded to the University of Southern California, and contract N01-PC-54404 awarded to the Public Health Institute; and the Centers for Disease Control and Prevention’s National Program of Cancer Registries, under agreement 1U58DP00807-01 awarded to the Public Health Institute. The ideas and opinions expressed herein are those of the author(s) and endorsement by the State of California, Department of Public Health the National Cancer Institute, and the Centers for Disease Control and Prevention or their contractors and subcontractors is not intended nor should be inferred. This work was partially supported by the grant CA103457 from the National Cancer Institute to Kiumarss Nasseri and was approved by the Institutional Review Board of the Public Health Institute. The author acknowledges the valuable input by Paul K. Mills, PhD.
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Nasseri, K. Thyroid cancer in the Middle Eastern population of California. Cancer Causes Control 19, 1183–1191 (2008). https://doi.org/10.1007/s10552-008-9185-y
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DOI: https://doi.org/10.1007/s10552-008-9185-y