NTRK2 and head and neck squamous cell carcinoma: However, our fusion-positive reference RNA includes gene fusions for all 4 OncoPrism-HNSCC reported genes, including NTRK2. The NTRK2 fusion was detected across all 15 positive control samples processed as batch controls for technical assessments (Table 3), and in all fusion-positive/fusion-negative reference RNA mixes used for the sensitivity experiments (Supplementary Table 9).