Days Set Up
Monday – Thursday
Analytic Time

3 – 10 days

MiChart Code
NR4A3 (9q22-9q31) Rearrangement by FISH
Soft Order Code

Test Updated:


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Test Overview

Test Methodology

Fluorescence In Situ Hybridization (FISH)

Test Usage

NR4A3 encodes an orphan nuclear receptor. Rearrangements of NR4A3 occur in more than 80% of extraskeletal myxoid chondrosarcoma (EMC) as well as in salivary acinic cell carcinoma (AciCC), driving tumorigenesis. With EMC, NR4A3 rearrangements fuse the 3’ end of NR4A3, including its DNA binding domain, to a variety of 5’ oncogenic transcription activator fusion partners. With AciCC, NR4A3 rearrangement translocates highly active chromatin regions to the upstream region of NR4A3. The detection of NR4A3 rearrangements can be useful in diagnosing EMC and AciCC – including uncommon histologic variants – and in distinguishing these neoplasms from other myxoid neoplasms and salivary gland tumors, respectively.

Reference Range

Interpretive report provided.

*Reference ranges may change over time. Please refer to the original patient report when evaluating results.

* Reference ranges may change over time. Please refer to the original patient report when evaluating results.

Specimen Requirements

Collection Offsite

A formalin-fixed, paraffin-embedded tissue block (containing sufficient neoplastic cells) is preferred. Unstained slides (3 slides cut at 4-microns) with associated H&E-stained slide are also acceptable. Decalcified tissue or tissues with other fixatives will be accepted and the assay attempted; however, these specimens may result in failed testing due to degraded nucleic acid. Both blocks and slides should be stored at room temperature.

Normal Volume
Formalin-fixed, paraffin-embedded tissue
Minimum Volume

Billing Information

CPT Code
Pro Fee Code

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Our High Standard

Quality that sets us apart

As the reference laboratory division of Michigan Medicine's Department of Pathology, MLabs shares the institution's commitment to applying established quality principles to clinical laboratory testing. Like other large organizations in complex, consequential fields, we rely on an established approach to monitor quality throughout the testing process.