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A novel TMTC2-NTRK3 fusion in undifferentiated high-grade pleomorphic sarcoma

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Abstract

Undifferentiated high-grade pleomorphic sarcoma (UHPS) is a rare soft tissue sarcoma (STS) originated from mesenchyme. UHPS is mostly advanced, aggressive and has poor prognosis. Patients with UHPS tend to have a lower 5-year survival rate than patients with other types of STS. NTRK fusions are commonly found in rare histological tumor types. Among sarcomas, 90% of infantile fibrosarcomas have NTRK fusions. Many other types of sarcomas have also been studied for NTRK fusions. Targeted therapy with NTRK inhibitors, such as Larotrectinib and Entrectinib, leads to response in most patients with NTRK1/2/3 gene fusion-positive tumors. Herein, we present a 68-years old man with UHPS by pathological diagnosis. Next-generation sequencing (NGS) revealed a novel TMTC2-NTRK3 fusion, which was also detected by immunohistochemistry (IHC) and fluorescence in situ hybridization (FISH). This report broadens the spectrum of NTRK fusions in UHPS and highlights a new target for treatment.

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Abbreviations

UHPS:

Undifferentiated high-grade pleomorphic sarcoma

PET/CT:

Positron emission tomography-computed tomography

VMAT:

Volumetric-modulated arc therapy

HE:

Hematoxylin and eosin

FISH:

Fluorescence in situ hybridization

IHC:

Immunohistochemistry

SMA:

Smooth muscle actin

NTRK:

Neurotrophic tyrosine receptor kinase

STS:

Soft tissue sarcoma

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Acknowledgements

We thank all our colleagues for the intensive studies of this case.

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Contributions

CB and LZ conceived the idea, and is the patient’s primary oncologist; Drafted the initial draft alongside comprehensive literature review by XY, YJ, and TS; Additional details provided by YW, assisted with material and data collection; ZF revised the draft before an additional round of revisions by all authors.

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Correspondence to Zhengfu Fan.

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The authors declare no competing financial interests.

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Bai, C., Zhang, L., Wang, Y. et al. A novel TMTC2-NTRK3 fusion in undifferentiated high-grade pleomorphic sarcoma. J Cancer Res Clin Oncol 148, 2933–2937 (2022). https://doi.org/10.1007/s00432-022-04249-x

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  • DOI: https://doi.org/10.1007/s00432-022-04249-x

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