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Neurotrophic tyrosine receptor kinase (NTRK1/2/3) fusions are oncogenic drivers in approximately 0.3% of solid tumors. High-quality testing to identify patients with NTRK fusion-positive tumors who could benefit from tropomyosin receptor kinase inhibitors is recommended, but the current NTRK testing landscape, including next-generation sequencing (NGS), is fragmented and availability of assays varies widely. The analytical and clinical performance of four commonly available RNA-based NGS assays, Archer's FusionPlex Lung panel (AFL), Illumina's TruSight Oncology 500 (TSO500), Thermo Fisher's Oncomine Precision Assay and Oncomine Focus Assay (OFA), were evaluated. Experiments were conducted using contrived samples [formalin-fixed, paraffin-embedded cell lines and SeraSeq formalin-fixed, paraffin-embedded reference material], NTRK fusion-negative clinical samples, and NTRK fusion-positive …