This is a prospective interventional study testing the hypothesis that the inhibition of MEK can restore iodine incorporation in BRAF wild type (WT) and a combined inhibition of BRAF and MEK can restore iodine incorporation in BRAFV600E mutant (MUT), radioiodine-refractory (RAIR) thyroid cancer. Patients with proven iodine negative tumor lesion(s) will be included in this study. Patients will then receive Trametinib (WT-group) or Dabrafenib and Trametinib combination-therapy (MUT-group) for approximately 3 weeks, after which a Thyrogen-stimulated 123I SPECT imaging will be performed. For patients whose tumor(s) demonstrate sufficient iodine incorporation in the post drug treatment 123I SPECT imaging, a treatment according to guidelines for iodine positive lesions will be performed. The follow up of the patients will be conducted as standard of care.
This is a prospective interventional trial that aims to restore iodine incorporation in tumoral lesions of patients with unresectable, radioiodine-refractory thyroid cancer.