All interpretable cases harbored an ETV6-NTRK3 gene fusion by reverse transcription polymerase chain reaction and/or an ETV6 rearrangement by fluorescence in situ hybridization, with duplication of the oncogenic derivative in 2 cases.     ///    "Histologic and immunohistochemical analyses, fluorescence in situ hybridization using break-apart probes specific to ETV6 on 12p13, reverse transcription polymerase chain reaction with in-house probes specific to the ETV6-NTRK3 gene fusion, and DNA copy number variation by array comparative genomic hybridization analyses were performed on all cases. "    ///    Secretory Breast Carcinoma: A Histopathologic and Genomic Spectrum Characterized by a Joint Specific ETV6-NTRK3 Gene Fusion..     ///    "The 2 cases with ETV6-NTRK3 duplication included a gain of 12p starting from the ETV6 locus to the telomere, associated with a gain of the 15q from the centromere to NTRK3 in 1 case, and in the other a normal profile up to NTRK3 on 15q, and then a loss up to the telomere, suggesting loss of corresponding normal chromosome 15. "