HIF-1alpha Expression in BRAF(V600E)-Positive Papillary Thyroid Microcarcinoma / 대한갑상선학회지
Journal of Korean Thyroid Association
;
: 102-108, 2011.
Article
Dans Anglais
| WPRIM
| ID: wpr-151706
ABSTRACT
BACKGROUND AND OBJECTIVES:
Recent studies have reported that vascular endothelial growth factor (VEGF) and hypoxia-inducible factor (HIF)-1alpha are up-regulated in BRAF(V600E)-positive papillary thyroid carcinoma (PTC). We investigated whether papillary thyroid microcarcinomas (PTMCs) also exhibited increased expression of VEGF and HIF-1alpha. In addition, we analyzed the relationship between BRAF(V600E) mutation and clinicopathological parameters, as well as HIF-1alpha expression in PTMC. MATERIALS ANDMETHODS:
We retrospectively selected 225 patients with PTMC. Immunohistochemical staining for HIF-1alpha and VEGF was performed using paraffinembedded PTMC tissue microarrays. BRAF(V600E) mutation status was analyzed by dideoxy sequencing.RESULTS:
PTMCs larger than 0.5 cm tend to be related to aggressive clinicopathological features such as thyroid capsular invasion (p=0.023) and bilaterality (p=0.047). Immunoreactivity to HIF-1alpha (20.7%) and VEGF (30.2%) was more prominent in PTMCs as compared to normal follicular cells. However, HIF-1alpha and VEGF expression was not correlated with clinicopathological features. BRAF(V600E) mutation was found in 70.7% (159/225) of the PTMC cases. PTMCs harboring the BRAF(V600E) mutation exhibited larger tumor sizes as compared to PTMCs without the BRAF(V600E) mutation (p=0.038). However, BRAF(V600E) mutation status did not correlate with the expression of HIF-1alpha (p=0.623) or VEGF (p=0.990).CONCLUSION:
HIF-1alpha and VEGF were more frequently detected in PTMCs as compared to normal thyroid tissues. However, BRAF(V600E) mutation status was not correlated with the expression of HIF-1alpha or VEGF in PTMCs.
Texte intégral:
Disponible
Indice:
WPRIM (Pacifique occidental)
Sujet Principal:
Glande thyroide
/
Tumeurs de la thyroïde
/
Carcinomes
/
Carcinome papillaire
/
Études rétrospectives
/
Facteur de croissance endothéliale vasculaire de type A
/
Protéines proto-oncogènes B-raf
/
Facteur-1 induit par l'hypoxie
Type d'étude:
Étude observationnelle
Limites du sujet:
Humains
langue:
Anglais
Texte intégral:
Journal of Korean Thyroid Association
Année:
2011
Type:
Article
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