NDLI: A pooled analysis of case-control studies of thyroid cancer ¶II. Menstrual and reproductive factors

Content Provider	Springer Nature Link
Author	Negri, Eva Maso, Luigi Dal Ron, Elaine Vecchia, Carlo La Mark, Steven D. Preston Martin, Susan McTiernan, Anne Kolonel, Laurence Yoshimoto, Yasuhiko Jin, Fan Wingren, Gun Galanti, Maria Rosaria Hardell, Lennart Glattre, Eystein Lund, Eiliv Levi, Fabio Lis, Dimitrios Braga, Claudia Franceschi, Silvia
Copyright Year	1999
Abstract	Objective: It has been suggested that female hormones, and hence menstrual and reproductive factors, play a role in thyroid cancer etiology. Epidemiological data, however, are limited and inconsistent, partly because of the small number of cases included in each study. To clarify the etiology of thyroid cancer, we conducted a pooled analysis of original data from 14 case-control studies, 4 from the United States, 2 from Asia, and 8 from Europe.Methods: This analysis included a total of 2,247 female cases of thyroid cancer (80% papillary) and 3,699 control women. Pooled odds ratios (OR) were estimated using logistic regression, conditioning on study and (i) matching sets for individually matched studies, or (ii) quinquennia of age for the other studies. Additional terms for age and history of radiation exposure were included in the regression equations.Results: The OR per year of later menarche was 1.04 (95% confidence interval (CI) 1.0–1.1). Compared to pre-menopausal women, the OR was 1.3 for women with natural menopause, and 1.8 for those with artificial menopause, but the studies were heterogeneous and the association may be due, at least in part, to diagnostic or ascertainment bias. Parity, spontaneous or induced abortions and history of infertility were not associated with thyroid cancer risk. The OR was above unity in women reporting later age at first birth (OR=1.1, 95% CI 1.0–1.3 for 5-year delay) and higher in the first years after a birth.Conclusions: The associations of menstrual and reproductive factors with thyroid cancer risk were generally weak, but appeared stronger among women diagnosed with thyroid cancer at younger ages.
Starting Page	143
Ending Page	155
Page Count	13
File Format	PDF
ISSN	09575243
Journal	Cancer Causes & Control
Volume Number	10
Issue Number	2
e-ISSN	15737225
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Public Health/Gesundheitswesen Hematology Oncology Epidemiology
Content Type	Text
Resource Type	Article
Subject	Cancer Research Oncology

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