BRAF in primary and recurrent papillary thyroid cancers: the relationship with (131)I and 2-[(18)F]fluoro-2-deoxy-D-glucose uptake ability

European Journal of Endocrinology
Susi BarolloCaterina Mian

Abstract

BRAF V600E is a potential marker of poor prognosis in papillary thyroid cancers (PTC). In a previous report, we showed that recurrent PTC with no radioiodine ((131)I) uptake are frequently associated with BRAF mutations, a low expression of thyroid-related genes and a high expression of glucose type-1 transporter gene. The aim of the present study was to assess BRAF status in a large series of recurrent PTC patients, considering paired primary and recurrent cancers. The BRAF genotype was correlated with the ability to concentrate (131)I and/or 2-[(18)F]fluoro-2-deoxi-d-glucose ((18)F-FDG) in the recurrent cancers, serum markers of recurrence, and patient outcome. We studied 50 PTC patients with recurrent cervical disease submitted to a re-intervention, followed up in median for 9 years. BRAF analysis was conducted by direct sequencing and mutant allele-specific PCR amplification. In 18 cases, molecular analysis was also assessed in the primary cancer. Out of 50 patients, 30 underwent (18)F-FDG-positron emission tomography-computed tomography. BRAF V600E-positive recurrent patients were found (131)I-negative in 94% of cases (P<0.001); 73% of the cancers carrying BRAF V600E were both (131)I-negative and (18)F-FDG positive. In pai...Continue Reading

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