ras Mutations are associated with aggressive tumor phenotypes and poor prognosis in thyroid cancer

Ginesa Garcia-Rostan, Hongyu Zhao, Robert L. Camp, Marina Pollan, Agustin Herrero, Javier Pardo, Ran Wu, Maria Luisa Carcangiu, Jose Costa, Giovanni Tallini

Research output: Contribution to journalArticlepeer-review

Abstract

Purpose: ras oncogenic activation has long been demonstrated in thyroid carcinomas of follicular cell derivation, but no consistent relationship has been shown between mutations and clinicopathologic features. Materials and Methods: We analyzed H-, K-, and N-ras mutations by polymerase chain reaction-single-strand conformational polymorphism followed by DNA sequencing in 125 thyroid carcinoma specimens from 107 patients, to include tumors covering the entire spectrum of thyroid tumor differentiation. Results: Mutations were identified in four (8.2%) of 49 well-differentiated carcinomas (WDCs; two [6.7%] of 30 of the tumors were papillary carcinomas, two [10.5%] of 19 of them were follicular carcinomas), in 16 (55.2%) of 29 poorly differentiated carcinomas (PDCs), and in 15(51.7%) of 29 undifferentiated carcinomas, with a significant association between ras mutation and poorly or undifferentiated tumors (P <.001). Twenty-six (74.3%) of 35 patients with ras-mutated tumors died as a result of disease as opposed to 23 (31.9%) of 72 patients with tumors lacking the mutations. Among patients with differentiated thyroid carcinomas (WDC and PDC), 11 (55.0%) of 20 patients with mutated tumors died as a result of disease as opposed to nine (15.5%) of 58 patients with wild-type ras tumors, and the correlation was independent of tumor differentiation and stage (P = .016). K-ras codon 13 mutations (all with G-A nucleotide transitions resulting in Gly>Asp substitution) and single activating mutations in any of the ras genes were also independent predictors of poor survival in differentiated thyroid carcinomas (P = .027 and P = .007, respectively). Conclusion: These findings demonstrate that ras mutations are a marker for aggressive cancer behavior and indicate a possible role of ras genotyping to identify thyroid carcinoma subsets associated with poor prognosis.

Original languageEnglish
Pages (from-to)3226-3235
Number of pages10
JournalJournal of Clinical Oncology
Volume21
Issue number17
DOIs
Publication statusPublished - Sep 1 2003

ASJC Scopus subject areas

  • Cancer Research
  • Oncology

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