KIT Gene Immunohistochemistry (IHC)
Notes**Note 1:** Physician statement of KIT IHC can be used to code this data item when no other information is available. **Note 2:** KIT Gene Immunohistochemistry (IHC) is the expression of the KIT gene in tumor tissue specimens based on immunohistochemical (IHC) stains. A positive test is a diagnostic and predictive marker for GIST tumors. Do not record secondary or acquired mutations that may have developed because of long-term imatinib treatment. **Note 3:** Other names for KIT are CD117 or c-kit.
NAACCR ItemNAACCR #3865
|0||KIT negative/normal; within normal limits|
|7||Test ordered, results not in chart|
|8||Not applicable: Information not collected for this case (If this information is required by your standard setter, use of code 8 may result in an edit error.)|
|9||Not documented in medical record Cannot be determined by pathologist KIT not assessed or unknown if assessed|