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BRAF mutations in thyroid cancer.

Rafael Selbach Scheffel1,2, Jose Miguel Dora1, Ana Luiza Maia1

  • 1Thyroid Unit, Hospital de Clínicas de Porto Alegre, Medical School.

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BRAF mutations impact thyroid cancer progression and treatment. While their prognostic role in papillary thyroid cancer is debated, they identify anaplastic thyroid cancer patients eligible for targeted therapies like dabrafenib and trametinib.

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Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Activating mutations in the mitogen-activated protein kinase (MAPK) pathway are crucial in papillary (PTC) and anaplastic (ATC) thyroid cancer.
  • BRAF mutations, particularly V600E, are frequently observed in these thyroid cancers.

Purpose of the Study:

  • To review the impact of BRAF mutations on the clinical features of thyroid cancer.
  • To discuss the implications of BRAF mutations for patient treatment strategies.

Main Methods:

  • Literature review focusing on studies investigating BRAF mutations in thyroid cancer.
  • Analysis of clinical data and treatment outcomes related to BRAF mutation status.

Main Results:

  • BRAF V600E mutations are associated with aggressive PTC, though their prognostic significance is debated.
  • These mutations lead to increased cell proliferation and reduced radioiodine responsiveness in thyroid cancer.
  • Other pathways like Notch signaling may contribute to BRAF-mutant tumor aggressiveness.
  • Combination therapy with BRAF and MEK inhibitors shows promise for BRAF-mutated ATCs.

Conclusions:

  • BRAF mutations influence thyroid cancer aggressiveness and treatment response.
  • In ATC, BRAF mutations predict eligibility for targeted therapies, used in neoadjuvant and metastatic settings.
  • Further research is needed to clarify the prognostic role of BRAF mutations in PTC and elucidate co-operating pathways.