Journal
JOURNAL OF CLINICAL ENDOCRINOLOGY & METABOLISM
Volume 88, Issue 5, Pages 2318-2326Publisher
ENDOCRINE SOC
DOI: 10.1210/jc.2002-021907
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Funding
- NCI NIH HHS [CA75425, R01-CA88041] Funding Source: Medline
- NCRR NIH HHS [M01 RR08084] Funding Source: Medline
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A series of 88 conventional follicular and Hurthle cell thyroid tumors were analyzed for RAS mutations and PAX8-PPARgamma rearrangements using molecular methods and for galectin-3 and HBME-1 expression by immunohistochemistry. A novel LightCycler technology-based method was developed to detect point mutations in codons 12/13 and 61 of the H-RAS, K-RAS, and N-RAS genes. Forty-nine percent of conventional follicular carcinomas had RAS mutations, 36% had PAX8-PPARgamma rearrangement, and only one (3%) had both. In follicular adenomas, 48% had RAS mutations, 4% had PAX8-PPARgamma rearrangement, and 48% had neither. Follicular carcinomas with PAX8-PPARgamma typically showed immunoreactivity for galectin-3 but not for HBME-1, tended to present at a younger patient age and be smaller size, and were almost always overtly invasive. In contrast, follicular carcinomas with RAS mutations most often displayed an HBME-1-positive/galectin-3-negative immunophenotype and were either minimally or overtly invasive. Hurthle cell tumors infrequently had PAX8-PPARgamma rearrangement or RAS mutations. These results suggest that conventional follicular thyroid carcinomas develop through at least two distinct and virtually nonoverlapping molecular pathways initiated by either RAS point mutation or PAX8-PPARgamma rearrangement.
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