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Updated: Jul 13, 2025

Oncogenic Gene Fusion Detection Using Anchored Multiplex Polymerase Chain Reaction Followed by Next Generation Sequencing
Published on: July 5, 2019
[Receptor tyrosine kinase- fusions in paediatric spindle cell tumors]
Christiane Brenner1, Christine Sanders2, Christian Vokuhl3
1Sektion Kinderpathologie, Institut für Pathologie, Universitätsklinikum Bonn, Venusberg-Campus 1, 53127, Bonn, Deutschland. christiane.brenner@ukbonn.de.
Abstract:
Pediatric spindle cell tumors are rare and often difficult to diagnose due to a similar morphology and a non-specific immunohistochemical profile. Genetic characterization of these lesions has been constantly improving, which has led to the identification of new subgroups that were partly included in the WHO classification. Receptor tyrosine kinase fusions play a special role in these tumors and their verification has diagnostic relevance and can be an option for target-oriented therapies. In the case of pediatric spindle cell tumors, genetic fusions form especially with NTRK1‑3, ALK, RET, and ROS1. Overall, pediatric tumors with receptor tyrosine kinase fusions are predominantly low-grade tumors, which are often subdivided into the group of intermediate-malign tumors.
Insights
Pediatric spindle cell tumors are challenging to diagnose. Identifying receptor tyrosine kinase fusions, such as NTRK, ALK, RET, and ROS1, aids in classifying these rare tumors and offers potential targeted therapies.
Area of Science:
- Oncology
- Genetics
- Pathology
Context:
- Pediatric spindle cell tumors represent a rare and diagnostically challenging group of neoplasms.
- Their similar morphology and non-specific immunohistochemical profiles complicate accurate diagnosis.
- Advances in genetic characterization have led to the identification of novel subgroups, influencing WHO classifications.
Purpose:
- To highlight the diagnostic and therapeutic significance of receptor tyrosine kinase (RTK) fusions in pediatric spindle cell tumors.
- To underscore the role of genetic profiling in refining tumor classification and guiding treatment strategies.
Summary:
- Receptor tyrosine kinase fusions, particularly involving NTRK1-3, ALK, RET, and ROS1, are crucial in specific pediatric spindle cell tumors.
- Verification of these genetic alterations is diagnostically relevant and supports the development of targeted therapies.
- These RTK-fusion-positive tumors are often low-grade and fall into the intermediate-malignancy category.
Impact:
- Improved diagnostic accuracy for rare pediatric spindle cell tumors.
- Identification of actionable targets for personalized, therapy-oriented treatments.
- Enhanced understanding of the molecular landscape of pediatric spindle cell neoplasms.
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