Journal
VIRCHOWS ARCHIV
Volume 481, Issue 5, Pages 793-797Publisher
SPRINGER
DOI: 10.1007/s00428-022-03353-0
Keywords
ETV6; NTRK3 fusion; Tracheal adenocarcinoma; Tracheal tumor
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Funding
- Takeda Science Foundation
- [19K07469]
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This case report describes a 64-year-old female patient with low-grade tracheal adenocarcinoma and the identification of ETV6::NTRK3 fusion. The adenocarcinoma exhibited complicated tubule-papillary or cribriform patterns, and immunohistochemistry showed positivity for MUC5AC and MUC4, as well as nuclear expression of the pan-Trk antibody.
The prevalence of NTRK fusions in non-small cell carcinoma (NSCLC) is only approximately 0.2%, most of which harbor NTRK1 fusions. NSCLCs with NTRK3 fusions are extremely rare. Herein, we report a case of low-grade tracheal adenocarcinoma in a 64-year-old woman. Histologically, areas of complicated tubule-papillary or cribriform patterns constituted a major component of the tumor and comprised cuboidal to columnar epithelial tumor cells with pale eosinophilic cytoplasm and cytoplasmic mucin, similar to subsets of sinonasal low-grade non-intestinal-type adenocarcinomas. Immunohistochemically, the tumor was positive for MUC5AC and MUC4 and showed nuclear expression of the pan-Trk antibody. ETV6::NTRK3 was identified by reverse transcription-polymerase chain reaction using formalin-fixed paraffin-embedded tissues. To the best of our knowledge, this is the first case of low-grade tracheal adenocarcinoma with ETV6::NTRK3 fusion. Our case illustrates that low-grade adenocarcinomas with ETV6::NTRK3 fusion may exist throughout the respiratory tract.
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