NTRK3 and mesenchymal cell neoplasm: The t(12;15) translocation, producing an ETV-NTRK3 fusion that encodes a chimeric tyrosine kinase and is characteristic of SBC, has also been recorded in the pediatric mesenchymal tumors cellular mesoblastic nephroma and infantile fibrosarcoma [5, 20] where the chimeric kinase appears to be responsible [14].