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NRAS Mutation Assay

Reference Number: AA-00431




NRAS Mutation Detection

 

Clinical Significance:

The American Society of Clinical Oncologists (ASCO), ASCP, CAP, AMP, and National Comprehensive Cancer Network (NCCN) recommend routine testing for RAS mutation at diagnosis of stage IV disease and all colorectal carcinomas considered for therapy with cetuximab or panitumumab, either alone or in combination with other anti-cancer agents.

https://www.nccn.org/professionals/physician_gls/pdf/colon.pdf

 

Specimen Requirements and Collection:

Formalin fixed tissue containing a sufficient amount of tumor (generally at least several mm of tumor tissue submitted in the tissue block).  The NRAS test utilized by our laboratory will detect mutations as long as they constitute at least 10% of the DNA sample population.

 

Methodology:

DNA isolation and extraction, library prep, and next-generation sequencing (NGS) for hotspot mutations NRAS exon 2, 3, and 4

 

Forms:

Molecular Pathology requisition form

 

Transport:

Send formalin-fixed, paraffin-embedded (FFPE) tissue and cell block containing tumor at room temperature.  Also acceptable 10-unstained, 4-5 micron slides with 1 post H&E.  Please include a surgical pathology report

 

Unacceptable specimen:

Specimens fixed in alternative fixatives or metal fixatives (ex. B-plus).  Decalcified specimens.

 

Reference Range:

NRAS mutation not detected = negative result

NRAS mutation detected = positive result

 

CPT codes:

88381, 81311, 81403, G0452

 

Test reported:

Results are reported within 7-10 days