EWSR1 Rearrangement Testing
EWSR1 is a gene that can form rearrangements with several partner genes in a range of bone and soft-tissue tumours. Testing may support a diagnosis when interpreted with the tumour’s microscopic appearance, immunohistochemistry, imaging, and clinical findings.
Why Testing Is Requested
- To investigate a suspected Ewing sarcoma or another tumour in which an EWSR1 rearrangement may occur.
- To help distinguish between tumours with overlapping microscopic features.
- To identify a specific fusion partner when a broader RNA or DNA assay is clinically useful.
Testing Methods
FISH can detect an EWSR1 rearrangement but may not identify the fusion partner. RT-PCR or sequencing-based assays can detect selected or broader fusion events, depending on the panel design and specimen quality.
Interpretation and Limitations
An EWSR1 rearrangement is not specific to a single tumour type. A positive or negative result must be interpreted by a pathologist in the full diagnostic context. Assay coverage, tumour content, and RNA or DNA quality can affect results.
Testing at Jaipur Molecular Lab
Contact our team to confirm the available method, accepted specimen type, tissue requirements, and reporting timeline.
This information is for general education and does not replace medical advice. Test selection and interpretation should be discussed with the treating clinician and pathologist.