A new BRAF gene mutation detected in a case of a solid variant of papillary thyroid carcinoma.
BRAF gene mutations have been frequently detected in papillary thyroid carcinoma (PTC). Moreover, there is a close association between the type of mutation and the PTC histotype: BRAF(V600E) is associated with conventional PTC and with histological variants of PTC displaying a prominent papillary growth pattern, whereas BRAF(K601E) is associated with the follicular variant of PTC. We report the detection of a novel BRAF triplet deletion in a case of PTC displaying a predominantly solid growth pattern. The deletion leads to the replacement of a valine and a lysine by a glutamate in the BRAF activation segment (BRAF(VK600-1E)), thus mimicking partially the 2 BRAF mutations previously described. Our study reinforces the existence of a close relationship between the occurrence of some types of BRAF mutation and some PTC histotypes. The genetic study of more cases of the solid variant of PTC is necessary to find whether there exists a significant association between the occurrence of BRAF(VK600-1E) and such PTC histotype.
Trovisco
Vítor
V
Institute of Molecular Pathology and Immunology of the University of Porto, Porto, Portugal.
Soares
Paula
P
Soares
Ricardo
R
Magalhães
João
J
Sá-Couto
Pedro
P
Sobrinho-Simões
Manuel
M
D000595:Amino Acid Sequence; D001483:Base Sequence; D002291:Carcinoma, Papillary / Q000235:genetics* / Q000473:pathology; D004252:DNA Mutational Analysis; D005260:Female; D006801:Humans; D008875:Middle Aged; D009154:Mutation; D009363:Neoplasm Proteins / Q000235:genetics*; D016133:Polymerase Chain Reaction; D018807:Polymorphism, Single-Stranded Conformational; D048493:Proto-Oncogene Proteins B-raf / Q000235:genetics*; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000473:pathology
D009363:Neoplasm Proteins; C482119:BRAF protein, human; D048493:Proto-Oncogene Proteins B-raf