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Age at diagnosis and gender modify the risk of 9q22 and 14q13 polymorphisms for papillary thyroid carcinoma.

INTRODUCTION: Papillary thyroid cancer (PTC) shows familial occurrence, and some susceptibility single nucleotide polymorphisms (SNPs) have been identified in FOXE1 and near the NKX2-1 locus. The aim of our study was to analyse the association of PTC risk with SNPs in FOXE1 (rs965513, rs1867277, rs1443434) and near the NKX2-1 locus (rs944289) in a Polish population, and, in the second step, the interac-tion between SNPs and patient-related factors (age at diagnosis and gender).

MATERIAL AND METHODS: A total of 2243 DNA samples from PTC patients and 1160 controls were included in the study. The SNP analysis was performed with the allelic discrimination technique.

RESULTS: There were significant associations of all SNPs with PTC (rs965513 odds ratio [OR] = 1.72, p = 8 × 10-7; rs1867277 OR = 1.59, p = 1 × 10-6; rs1443434 OR = 1.53, p = 1 × 10-5; rs944289 OR = 1.52, p = 4 × 10-5). Logistic regression analysis revealed an increased PTC risk in the interaction of rs944289 with age at diagnosis (OR = 1.01 per year, p = 6 × 10-4) and a decreased PTC risk in the interaction of male gender with the GGT FOXE1 protective haplotype (OR = 0.69, p = 0.01).

CONCLUSIONS: the association between PTC and all analysed SNPs was confirmed. It was also shown that patient-related factors modify the predisposition to PTC by increasing the risk for rs944289 per year of age, and by enhancing the protective effect of the FOXE1 GGT haplotype in men.

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