Data Last Updated: June 9, 2025

NAACCR Item #3850: HER2 IHC Summary

Item # Length Source of Standard Section Name Year Implemented Version Implemented XML NAACCR ID Parent XML Element
3850 1 NAACCR Stage/Prognostic Factors 2018 18 her2IhcSummary Tumor
Required Status:

NPCR Collect: No recommendation
CoC Collect: No recommendation
SEER Collect: No recommendation
CCCR Collect: Historically collected and currently transmitted when available

Description
HER2 IHC Summary is the summary score for HER2 testing by IHC.
Rationale
HER2 IHC Summary is a Registry Data Collection Variable in AJCC. It is a new data item for cases diagnosed 1/1/2018+.
Allowable Values
0-4, 7-9
Codes
Code Description
0 Negative (Score 0)
1 Negative (Score 1+)
2 Equivocal (Score 2+) Stated as equivocal
3 Positive (Score 3+) Stated as positive
4 Stated as negative, but score not stated
7 Test ordered, results not in chart
8 Not applicable: Information not collected for this case (If this item is required by your standard setter, use of code 8 will result in an edit error.)
9 Not documented in medical record Cannot be determined (indeterminate) HER2 IHC Summary not assessed or unknown if assessed
Code Notes
Each Site-Specific Data Item (SSDI) applies only to selected primary sites, histologies, and years of diagnosis. Depending on applicability and standard-setter requirements, SSDIs may be left blank.