Larotrectinib to Enhance RAI Avidity in Differentiated Thyroid Cancer
Trial Parameters
Brief Summary
Papillary thyroid cancer (PTC) is the most common form of differentiated thyroid cancer (DTC). The traditional first line treatment for patients with advanced DTC after surgical resection is radioactive iodine (RAI) therapy. However, less than a quarter of patients with lung metastases will achieve a complete response to RAI therapy, and this therapy carries the risk of pulmonary fibrosis and an increasingly recognized risk of secondary malignancies.
Eligibility Criteria
Inclusion Criteria: 1. Age ≥ 1 year 2. Histologic diagnosis of a differentiated thyroid cancer, s/p thyroidectomy and adequate local therapy (e.g., lymph node dissection as per standard of care) for metastatic disease in the neck in the opinion of the treating investigator 3. Anatomically evaluable disease on chest CT meeting one of the following criteria (obtained within 90 days of enrollment): A. multiple (\> 10) noncalcified solid pulmonary nodules visible on CT and/or B. enlarging, discrete pulmonary nodules visible on CT of any number consistent with metastatic disease 4. Identification of an neurotrophic tyrosine receptor kinase (NTRK) (NTRK1, NTRK2, or NTRK3) gene fusion in a CLIA/CAP accredited laboratory without known kinase domain resistance mutation 5. Lansky/Karnofsky performance status ≥ 50% 6. Adequate Organ Function A. Bone Marrow Function: * Peripheral absolute neutrophil count (ANC) ≥ 1000/mm3 * Platelet count ≥ 100,000/mm3 (transfusion independent, defined as not rece