NTRK3 and salivary duct carcinoma: However, carcinomas may frequently display a diffuse oncocytic phenotype, being classified by their characteristic features (e.g., AR-positive salivary duct carcinoma, MEC with MAML2 rearrangements, secretory carcinoma with ETV6 NTRK3 gene fusion, and DOG1- and SOX10-positive acinic cell carcinoma).