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KIT Mutations, Melanoma
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Ordering Recommendation
Detect activating mutations in KIT and PDGFRA. Predict response to tyrosine kinase inhibitor (TKI) therapy.
Mnemonic
Methodology
Massively Parallel Sequencing
Performed
Varies
Reported
10-12 days
New York DOH Approval Status
Specimen Required
Tumor tissue.
Formalin fix (10 percent neutral buffered formalin) and paraffin embed tissue. Diff-Quik and Papanicolaou stained cytology smears are also acceptable. Number of slides needed is dependent on the tumor cellularity of the smear. Slide(s) will be destroyed during testing process and will not be returned to client. Protect from excessive heat. Transport block and/or slides in a tissue transport kit (ARUP supply #47808) available online through eSupply using ARUP Connect™ or contact ARUP Client Services at (800) 522-2787.
Resections: Transport 8 unstained 5-micron slides. (Min: 5 slides)
Small Biopsies: Transport 15 unstained 5-micron slides. (Min: 10 slides)
Room temperature. Also acceptable: Refrigerated. Ship in cooled container during summer months.
Less than 10 percent tumor. Specimens fixed/processed in heavy metal fixatives. Decalcified specimens. FNA smears with less than 50 tumor cells.
Include surgical pathology report.
If multiple specimens (blocks or slides) are sent to ARUP, they must be accompanied by one of the following: an order comment indicating that the ARUP pathologist should choose the specimen most appropriate for testing (e.g., "Choose best block"), or individual orders for each sample submitted. A Pathologist Block Selection Fee (ARUP test code 3002076) will be added to orders that utilize the first option. If multiple specimens are sent to ARUP without a request for pathologist block/slide selection or individual orders, they will be held until clarification is provided.
Ambient: Indefinitely; Refrigerated: Indefinitely; Frozen: Unacceptable
Reference Interval
By report
Interpretive Data
Refer to report.
This test was developed and its performance characteristics determined by ARUP Laboratories. It has not been cleared or approved by the US Food and Drug Administration. This test was performed in a CLIA certified laboratory and is intended for clinical purposes.
Laboratory Developed Test (LDT)
Note
A full list of the targeted genes and regions is listed in the Additional Technical Information.
Hotline History
CPT Codes
81272; 88381; 81314
Components
| Component Test Code* | Component Chart Name | LOINC |
|---|---|---|
| 2002148 | Block ID | 57723-9 |
| 2002694 | KIT Mutation, Melanoma Interpretation | 55201-8 |
Aliases
- c-KIT
- CD117 KIT
- cKIT
- KIT exons 9, 11,13, 14, 17, and 18
- TKI resistance
- TKI sensitivity
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