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Test ID RASFP RAS/RAF Targeted Gene Panel by Next-Generation Sequencing, Tumor

Useful For

Identifying tumors that may respond to targeted therapies by assessing multiple gene targets simultaneously

 

Identifying mutations that may help determine prognosis for patients with solid tumors

 

Identifying specific mutations within genes known to be associated with response or resistance to specific cancer therapies

Genetics Test Information

This extended RAS/RAF panel test uses targeted next-generation sequencing to evaluate for somatic mutations within the BRAF (exons 11 and 15), HRAS (exons 2 and 3), NRAS (exons 2, 3, 4), and KRAS (exons 2, 3, 4) genes. This includes, but is not limited to, the testing of somatic mutations in KRAS codons 12, 13, 59, 61, 117, 146; NRAS codons 12, 13, 59, 61,146; HRAS codons 12, 13, 61; and BRAF codons 594, 596, 600. See Targeted Gene Regions Interrogated by RAS/RAF Gene Panel in Special Instructions for details regarding the targeted gene regions identified by this test.

 

Of note, this test is performed to evaluate for somatic mutations within tumor samples. This test does not assess for germline alterations within the genes listed.

Highlights

This test provides evaluation of BRAF (including V600), HRAS, NRAS (includes codons 12, 13, 59, 61, and 146), and KRAS (includes codons 12, 13, 59, 61, 117, and 146) genes for somatic mutations.

Additional Tests

Test ID Reporting Name Available Separately Always Performed
SLIRV Slide Review in MG No Yes

Testing Algorithm

When this test is ordered, slide review will always be performed at an additional charge.

Method Name

Polymerase Chain Reaction (PCR)-Based Next Generation Sequencing

Reporting Name

RAS/RAF Panel, Tumor

Specimen Type

Varies


Advisory Information


 



Necessary Information


Pathology report (final or preliminary) at minimum containing the following information must accompany specimen in order for testing to be performed:

1. Patient name

2. Block number-must be on all blocks, slides and paperwork (can be handwritten on the paperwork)

3. Tissue collection date

4. Source of the tissue



Specimen Required


This assay requires at least 20% tumor nuclei.

-Preferred amount of tumor area with sufficient percent tumor nuclei: tissue144 mm(2)

-Minimum amount of tumor area: tissue 36 mm(2).

-These amounts are cumulative over up to 10 unstained slides and must have adequate percent tumor nuclei.

-Tissue fixation: 10% neutral buffered formalin, not decalcified

-For specimen preparation guidance, see Tissue Requirement for Solid Tumor Next-Generation Sequencing in Special Instructions. In this document, the sizes are given as 4mm x 4mm x 10 slides as preferred: approximate/equivalent to 144 mm(2) and the minimum as 3mm x 1mm x 10 slides: approximate/equivalent to 36mm(2).

 

Preferred:

Specimen Type: Tissue block

Collection Instructions: Submit a formalin-fixed, paraffin-embedded tissue block with acceptable amount of tumor tissue.

 

Acceptable:

Specimen Type: Tissue slide

Slides: 1 stained and 10 unstained

Collection Instructions: Submit 1 slide stained with hematoxylin and eosin and 10 unstained, nonbaked slides with 5-micron thick sections of the tumor tissue.

Note: The total amount of required tumor nuclei can be obtained by scraping up to 10 slides from the same block.

Specimen Type: Cytology slide (direct smears or ThinPrep)

Slides: 1 to 3 slides

Collection Instructions: Submit 1 to 3 slides stained and cover slipped with a preferred total of 5000 nucleated cells or a minimum of at least 3000 nucleated cells.

Note: Glass coverslips are preferred; plastic coverslips are acceptable but will result in longer turnaround times.

Additional Information: Cytology slides will not be returned.


Specimen Minimum Volume

See Specimen Required

Specimen Stability Information

Specimen Type Temperature Time Special Container
Varies Ambient (preferred)
  Frozen 
  Refrigerated 

Reference Values

An interpretive report will be provided.

Day(s) and Time(s) Performed

Monday through Friday; Varies

Performing Laboratory

Mayo Clinic Laboratories in Rochester

Test Classification

This test was developed and its performance characteristics determined by Mayo Clinic in a manner consistent with CLIA requirements. This test has not been cleared or approved by the U.S. Food and Drug Administration.

CPT Code Information

RAS/RAF Targeted Gene Panel by Next Generation Sequencing, Tumor

81210-BRAF (v-raf murine sarcoma viarl oncogene humolog B1) (eg, colon cancer), gene analysis, V600E variant

81275-KRAS (v-Ki-ras2 Kirsten rat sarcoma viral oncogene) (eg, carcinoma) gene analysis, variants in codons 12 and 13

81403-HRAS (v-Ha-ras Harvey rat sarcoma viral oncogene homolog) (eg, Costello syndrome), exon 2 sequence

81311-NRAS (neuroblastoma RAS viral [v-ras] oncogene homolog) (eg, colorectal carcinoma), gene analysis, variants in exon 2 (eg, codons 12 and 13) and exon 3 (eg, codon 61)

Slide Review

88381-Microdissection, manual

LOINC Code Information

Test ID Test Order Name Order LOINC Value
RASFP RAS/RAF Panel, Tumor In Process

 

Result ID Test Result Name Result LOINC Value
36725 Result Summary 50397-9
36726 Result 82939-0
36727 Interpretation 69047-9
36728 Additional Information 48767-8
36729 Specimen 31208-2
36730 Source 33725-3
36731 Tissue ID 80398-1
36732 Released By 18771-6

NY State Approved

Yes

Forms

If not ordering electronically, complete, print, and send an Oncology Test Request (T729) with the specimen.