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- W2069650023 abstract "Little is known about the role of specific oncogenes and tumor suppressor genes in radiation-induced thyroid cancer (RITC). In thyroid cancer, mutations in the p53 tumor suppressor gene have been largely confined to the more aggressive anaplastic forms. We studied point mutations in the p53 gene in 22 patients exposed in childhood to radiation in the head and neck area who later developed papillary thyroid cancers (RITC). Eighteen thyroid cancer patients without exposure to radiation, selected to match by gender and age the RITC group, were used as the control group. After histological identification, DNA was extracted from paraffin-embedded specimens. Exons 5-8 of p53 were PCR amplified and screened for mutations by single strand conformation polymorphism analysis and cycle sequencing. Four of 22 RITC patients (18%) showed missense point mutations. No missense mutations were found in the cancer control group. The missense mutations in the RITC group occurred at codon 208 in 2 patients, codon 177 in 1, and codon 217 in 1. The mutations were transitions from G to A and C to T. All patients with missense mutations were male and had lymph node involvement. Three of the 4 patients with p53 missense mutations had invasion of the cancer beyond the thyroid capsule compared to 2 of the 17 remaining RITC patients. None of the patients with p53 mutations had distant metastases or recurrence of the tumor. These results suggest that p53 gene point mutations may play a pathogenetic role in some radiation-induced, well differentiated thyroid cancers and in their local spread." @default.
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- W2069650023 date "1996-08-01" @default.
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- W2069650023 title "p53 gene mutations in radiation-induced thyroid cancer." @default.
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- W2069650023 doi "https://doi.org/10.1210/jcem.81.8.8768871" @default.
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