Kitahara, Cari M4; Gamborg, Michael6; Berrington de González, Amy4; Sørensen, Thorkild I A7; Baker, Jennifer L7
1 Department of Public Health, Department of Public Health, Faculty of Health and Medical Sciences, Københavns Universitet2 Section of Biostatistics, Department of Public Health, Faculty of Health and Medical Sciences, Københavns Universitet3 Section for Metabolic Genetics, The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, Københavns Universitet4 unknown5 Graduate School of Health and Medical Sciences, Faculty of Health and Medical Sciences, Københavns Universitet6 Graduate School of Health and Medical Sciences, Faculty of Health and Medical Sciences, Københavns Universitet7 Section for Metabolic Genetics, The Novo Nordisk Foundation Center for Basic Metabolic Research, Faculty of Health and Medical Sciences, Københavns Universitet
Taller stature and obesity in adulthood have been consistently associated with an increased risk of thyroid cancer, but few studies have investigated the role of childhood body size. Using data from a large prospective cohort, we examined associations for height and body mass index (BMI) at ages 7 to 13 years with risk of thyroid cancer in later life. The study population included 321,085 children from the Copenhagen School Health Records Register, born between 1930 and 1989 in Copenhagen, Denmark, with measurements of height and weight from 7 to 13 years of age. These data were linked with the Danish Cancer Registry to identify incident thyroid cancer cases (1968-2010). Hazard ratios (HR) and 95% confidence intervals (CI) were calculated for age- and sex-specific height and BMI SD scores (SDS) using proportional hazards models stratified by birth cohort and sex. During follow-up (median = 38.6 years), 171 women and 64 men were diagnosed with thyroid cancer. Both height and BMI were positively associated with thyroid cancer risk, and these associations were similar by age at measurement. Using age 10 as an example, HRs per 1 unit increase in SDS for height (~6-7 cm) and BMI (~1.5-2 kg/m(2)) were 1.22 (95% CI, 1.07-1.40) and 1.15 (95% CI, 1.00-1.34), respectively. These results, together with the relatively young ages at which thyroid cancers are diagnosed compared with other malignancies, suggest a potential link between early-life factors related to growth and body weight and thyroid carcinogenesis.
Cancer Research, 2014, Vol 74, Issue 1, p. 235-242
Adolescent; Body Height; Body Mass Index; Child; Cohort Studies; Denmark; Female; Humans; Male; Risk Factors; Thyroid Neoplasms