Enhancing Radioiodine Incorporation into Radioiodine-Refractory Thyroid Cancer with MAPK Inhibition (ERRITI): A Single-Center Prospective Two-Arm Study

Restoration of iodine incorporation (redifferentiation) by MAPK inhibition was achieved in previously radioiodine-refractory, unresectable thyroid carcinoma (RR-TC). However, results were unsatisfactory in BRAFV600E-mutant (BRAF-MUT) RR-TC. Here we assess safety and efficacy of redifferentiation the...

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Veröffentlicht in:Clinical cancer research 2022-10, Vol.28 (19), p.4194-4202
Hauptverfasser: Weber, Manuel, Kersting, David, Riemann, Burkhard, Brandenburg, Tim, Führer-Sakel, Dagmar, Grünwald, Frank, Kreissl, Michael C, Dralle, Henning, Weber, Frank, Schmid, Kurt Werner, Herrmann, Ken, Jentzen, Walter, Grafe, Hong, Rischpler, Christoph, Theurer, Sarah, Bockisch, Andreas, Nagarajah, James, Fendler, Wolfgang P
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container_end_page 4202
container_issue 19
container_start_page 4194
container_title Clinical cancer research
container_volume 28
creator Weber, Manuel
Kersting, David
Riemann, Burkhard
Brandenburg, Tim
Führer-Sakel, Dagmar
Grünwald, Frank
Kreissl, Michael C
Dralle, Henning
Weber, Frank
Schmid, Kurt Werner
Herrmann, Ken
Jentzen, Walter
Grafe, Hong
Rischpler, Christoph
Theurer, Sarah
Bockisch, Andreas
Nagarajah, James
Fendler, Wolfgang P
description Restoration of iodine incorporation (redifferentiation) by MAPK inhibition was achieved in previously radioiodine-refractory, unresectable thyroid carcinoma (RR-TC). However, results were unsatisfactory in BRAFV600E-mutant (BRAF-MUT) RR-TC. Here we assess safety and efficacy of redifferentiation therapy through genotype-guided MAPK-modulation in patients with BRAF-MUT or wildtype (BRAF-WT) RR-TC. In this prospective single-center, two-arm phase II study, patients received trametinib (BRAF-WT) or trametinib + dabrafenib (BRAF-MUT) for 21 ± 3 days. Redifferentiation was assessed by 123I-scintigraphy. In case of restored radioiodine uptake, 124I-guided 131I therapy was performed. Primary endpoint was the redifferentiation rate. Secondary endpoints were treatment response (thyroglobulin, RECIST 1.1) and safety. Parameters predicting successful redifferentiation were assessed using a receiver operating characteristic analysis and Youden J statistic. Redifferentiation was achieved in 7 of 20 (35%) patients, 2 of 6 (33%) in the BRAF-MUT and 5 of 14 (36%) in the BRAF-WT arm. Patients received a mean (range) activity of 300.0 (273.0-421.6) mCi for 131I therapy. Any thyroglobulin decline was seen in 57% (4/7) of the patients, RECIST 1.1 stable/partial response/progressive disease in 71% (5/7)/14% (1/7)/14% (1/7). Peak standardized uptake value (SUVpeak) < 10 on 2[18F]fluoro-2-deoxy-D-glucose (FDG)-PET was associated with successful redifferentiation (P = 0.01). Transient pyrexia (grade 3) and rash (grade 4) were noted in one patient each. Genotype-guided MAPK inhibition was safe and resulted in successful redifferentiation in about one third of patients in each arm. Subsequent 131I therapy led to a thyroglobulin (Tg) decline in more than half of the treated patients. Low tumor glycolytic rate as assessed by FDG-PET is predictive of redifferentiation success. See related commentary by Cabanillas et al., p. 4164.
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subjects Clinical Trials: Targeted Therapy
Fluorodeoxyglucose F18
Humans
Iodine Radioisotopes - therapeutic use
Prospective Studies
Protein Kinase Inhibitors - adverse effects
Proto-Oncogene Proteins B-raf - antagonists & inhibitors
Thyroglobulin - genetics
Thyroid Neoplasms - drug therapy
Thyroid Neoplasms - genetics
Thyroid Neoplasms - radiotherapy
title Enhancing Radioiodine Incorporation into Radioiodine-Refractory Thyroid Cancer with MAPK Inhibition (ERRITI): A Single-Center Prospective Two-Arm Study
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