Faculty, Staff and Student Publications
Publication Date
1-1-2025
Journal
JCO Precision Oncology
Abstract
Purpose: Neurotrophic tropomyosin receptor kinase (NTRK) fusions may act as an oncogenic driver in thyroid carcinomas. Given their low frequency, clinical, pathological, and molecular data on these patients and their responses to targeted therapies are limited.
Methods: This is an observational retrospective study conducted at a single high-volume cancer center in the United States. Data were retrospectively collected from medical records.
Results: We included 65 patients (37 adult, 28 pediatric) with an NTRK fusion-positive thyroid carcinoma (24 NTRK1, 41 NTRK3), of which 54 were papillary thyroid carcinomas (PTC), four poorly differentiated thyroid carcinomas (PDTC), and seven anaplastic thyroid carcinomas (ATC). In PTC, an extensive follicular growth pattern was seen in 22 (41%) patients. In adults, NTRK3 fusions were 3 times more frequent (nine NTRK1, 28 NTRK3), whereas in pediatric patients their frequencies were similar (15 NTRK1, 13 NTRK3; P = .021). In patients with PDTC/ATC treated with larotrectinib, we detected four emergent solvent front mutations (three NTRK3 G623R, one NTRK1 G595R) causing resistance to drug and disease progression. Three of them (two ATC, one PDTC) received second-line selitrectinib on a clinical trial. Partial responses were seen in all three patients, but both patients with ATC progressed within a year.
Conclusion: NTRK1/3 fusions are seen in PTC, PDTC, and ATC, and a follicular growth pattern was observed in a high proportion of cases. In patients treated with larotrectinib, NTRK solvent front mutations are the main resistance mechanism, frequently occurring in PDTC/ATC. Responses to single-agent TRK inhibitor are short-lived in patients with ATC; thus, these drugs should be used with caution in this population.
Keywords
Humans, Retrospective Studies, Male, Female, Thyroid Neoplasms, Adult, Middle Aged, Child, Receptor, trkA, Receptor, trkC, Aged, Adolescent, Young Adult, Molecular Targeted Therapy, Oncogene Proteins, Fusion, Pyrazoles, Pyrimidines
DOI
10.1200/PO.24.00321
PMID
39983078
PMCID
PMC11867807
PubMedCentral® Posted Date
2-21-2025
PubMedCentral® Full Text Version
Post-print
Published Open-Access
yes
Included in
Bioinformatics Commons, Biomedical Informatics Commons, Genetic Phenomena Commons, Medical Genetics Commons, Oncology Commons