Molecular genetic study comparing follicular variant versus classic papillary thyroid carcinomas: association of N-ras mutation in codon 61 with follicular variant.
Although the follicular variant of papillary thyroid carcinoma (FVPTC) has been classified as a papillary cancer based on nuclear features, its follicular growth pattern and potential for hematogenous spread are more characteristic of follicular carcinoma. To gain insight into the biologic nature of FVPTC, we compared genetic alterations characteristic of papillary and follicular thyroid carcinomas in 24 FVPTCs and 26 classic PTC (CPTCs). In FVPTCs, we observed ras mutation in 6 of 24 cases (25%), BRAF mutation in 1 of 13 cases (7.6%), and ret rearrangement in 5 of 12 cases (41.7%). In CPTCs, we found ras mutation in no case, BRAF mutation in 3 of 10 cases (30%), and ret rearrangement in 5 of 11 cases (45%). One FVPTC exhibited simultaneous ras mutation and ret/PTC1 rearrangement, and one CPTC harbored simultaneous BRAF mutation and ret/PTC3 rearrangement. Based on these findings, we concluded that ras mutation correlates with follicular differentiation of thyroid tumors whereas ret activation is associated with papillary nuclei but not with papillary architecture. ret activation is not exclusive of ras or BRAF mutation, whereas ras and BRAF mutations are mutually exclusive. The implications of these results for follicular and papillary carcinogenesis are discussed.
Di Cristofaro
Julie
J
Faculté de Médecine, Institut National de la Santé et de la Recherche Médicale (U555), 13385 Marseille Cedex 5, France.
Marcy
Myriam
M
Vasko
Vasily
V
Sebag
Frédéric
F
Fakhry
Nicolas
N
Wynford-Thomas
David
D
De Micco
Catherine
C
D018263:Adenocarcinoma, Follicular / Q000235:genetics* / Q000473:pathology; D000231:Adenocarcinoma, Papillary / Q000235:genetics* / Q000473:pathology; D000328:Adult; D004252:DNA Mutational Analysis; D017931:DNA Primers; D005260:Female; D011905:Genes, ras / Q000235:genetics; D006801:Humans; D008297:Male; D008967:Molecular Biology; D009154:Mutation; D020133:Reverse Transcriptase Polymerase Chain Reaction; D013964:Thyroid Neoplasms / Q000235:genetics* / Q000473:pathology
D017931:DNA Primers