American Journal of Epidemiology Advance Access published online on January 18, 2006
American Journal of Epidemiology, doi:10.1093/aje/kwj072
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1 From the Northern California Cancer Center, Fremont, California
* To whom correspondence should be addressed. Second malignancies in women diagnosed with thyroid cancer are of concern given the young average age at diagnosis and excellent survival. Data from the California Cancer Registry were used to evaluate the risk of second primary cancers among a retrospective population-based cohort of 10,932 women diagnosed with papillary thyroid cancer between 1988 and 1999. Follow-up was calculated from 2 months until the diagnosis of a second primary cancer, death, loss to follow-up, or December 31, 1999, whichever occurred first. Standardized incidence ratios, based on age-specific cancer incidence rates for California women, were calculated. During a total of 50,938 person-years of follow-up (mean: 4.7 years), 279 women developed a second primary cancer. The incidence of invasive breast cancer was not elevated compared with California women overall (standardized incidence ratio (SIR) = 0.9, 95% confidence interval (CI): 0.7, 1.1) or when stratified by age, race/ethnicity, follow-up, or radiation treatment. An excess of in situ breast cancer (SIR = 1.6, 95% CI: 1.0, 2.4), kidney cancer (SIR = 3.9, 95% CI: 2.2, 6.3), and melanoma (SIR = 2.1, 95% CI: 1.3, 3.2) limited to the first 5 years after diagnosis was observed. Women with papillary thyroid cancer are at increased risk of in situ, but not invasive, breast cancer, kidney cancer, and melanoma.
Received August 22, 2005
Accepted November 8, 2005
ORIGINAL CONTRIBUTIONS
Risk of Second Primary Malignancies in Women with Papillary Thyroid Cancer
Alison J. Canchola 1 *,
Pamela L. Horn-Ross 1,
and
David M. Purdie 1
Alison J. Canchola, E-mail: acanchol{at}nccc.org
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