In order to search for sequence variants conferring risk of thyroid cancer we conducted a genome-wide association study in 192 and 37,196 Icelandic cases and controls, respectively, followed by a replication study in individuals of European descent. Here we show that two common variants, located on 9q22.33 and 14q13.3, are associated with the disease. Overall, the strongest association signals were observed for rs965513 on 9q22.33 (OR = 1.75; P = 1.7 × 10−27) and rs944289 on 14q13.3 (OR = 1.37; P = 2.0 × 10−9). The gene nearest to the 9q22.33 locus is FOXE1 (TTF2) and NKX2-1 (TTF1) is among the genes located at the 14q13.3 locus. Both variants contribute to an increased risk of both papillary and follicular thyroid cancer. Approximately 3.7% of individuals are homozygous for both variants, and their estimated risk of thyroid cancer is 5.7-fold greater than that of noncarriers. In a study on a large sample set from the general population, both risk alleles are associated with low concentrations of thyroid stimulating hormone (TSH), and the 9q22.33 allele is associated with low concentration of thyroxin (T4) and high concentration of triiodothyronine (T3).
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We thank the study participants whose contribution made this work possible. This project was funded in part by the following contract numbers: US National Institutes of Health CA16058 and CA124570.
The authors from deCODE are shareholders in deCODE genetics Inc.
About this article
Fine mapping of 14q13 reveals novel variants associated with different histological subtypes of papillary thyroid carcinoma
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