Targeted Therapy in a Rare Spindle Cell Tumor with ETV6-NTRK3 Gene Fusion Rearrangement: A Case Report - Jessé Lopes da Silva; Andréa Rodrigues Cordovil Pires; Priscilla de Almeida Romeiro; Felipe de Carvalho Caetano; Carolina de Bustamante Fernandes; Sumara Abdo Lacerda Matedi; Andréia Cristina de Melo (Brazilian Journal of Oncology)