KIT Gene Immunohistochemistry (IHC)


**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. **Note 4:** Results from nodal or metastatic tissue may be used for KIT Gene Immunohistochemistry.




NAACCR #3865


Code Description
0 KIT negative/normal; within normal limits
1 KIT positive
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