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Ref Type Journal Article
PMID (25549723)
Authors Rothenberg SM, McFadden DG, Palmer EL, Daniels GH, Wirth LJ
Title Redifferentiation of iodine-refractory BRAF V600E-mutant metastatic papillary thyroid cancer with dabrafenib.
Journal Vol Issue Date Pages Journal Short Title
Clinical cancer research : an official journal of the American Association for Cancer Research 21 5 2015 Mar 01 1028-35 Clin Cancer Res
URL
Abstract Text To determine whether the selective BRAF inhibitor, dabrafenib, can stimulate radioiodine uptake in BRAF V600E-mutated unresectable or metastatic iodine-refractory papillary thyroid cancer (PTC).Ten patients with BRAF V600E-mutant iodine-refractory PTC were enrolled. Absence of radioiodine uptake on iodine-131 whole body scan obtained within 14 months of study entry was required. Each patient received dabrafenib (150 mg twice daily) for 25 days before thyrotropin α-stimulated iodine-131 whole body scan (4 mCi/148 MBq). Patients whose scan showed new sites of radioiodine uptake remained on dabrafenib for 17 more days, and then were treated with 150 mCi (5.5 GBq) iodine-131. The primary endpoint of the study was the percentage of patients with new radioiodine uptake after treatment with dabrafenib.Six of 10 patients (60%) demonstrated new radioiodine uptake on whole body scan after treatment with dabrafenib. All 6 were treated with 5.5 GBq iodine-131. Two patients had partial responses and 4 patients had stable disease on standard radiographic restaging at 3 months. Thyroglobulin decreased in 4 of 6 treated patients. One patient developed squamous cell carcinoma of the skin. There were no other significant adverse events attributed to dabrafenib.Dabrafenib can stimulate radioiodine uptake in patients with metastatic BRAF V600E-mutant iodine-refractory PTC, representing a potential new therapeutic approach for these patients.

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Molecular Profile Treatment Approach
Gene Name Source Synonyms Protein Domains Gene Description Gene Role
Therapy Name Drugs Efficacy Evidence Clinical Trials
Drug Name Trade Name Synonyms Drug Classes Drug Description
Gene Variant Impact Protein Effect Variant Description Associated with drug Resistance
Molecular Profile Indication/Tumor Type Response Type Therapy Name Approval Status Evidence Type Efficacy Evidence References
BRAF V600E papillary thyroid carcinoma sensitive Dabrafenib Clinical Study - Cohort Actionable In a clinical study, Tafinlar (dabrafenib) treatment stimulated radioiodine uptake in 60% (6/10) of patients with metastatic iodine-refractory papillary thyroid cancer harboring BRAF V600E (PMID: 25549723; NCT01534897). 25549723