NAACCR Item #3858: High Risk Histologic Features

Item # Length Source of Standard Year Implemented Version Implemented Year Retired Version Retired
3,858 1 NAACCR

NAACCR XML: Tumor.highRiskHistologicFeatures


High Risk Histologic Features are defined in AJCC 8 Chapter 15 to include the terms "poor differentiation, desmoplasia, sarcomatoid differentiation, undifferentiated." High risk histologic features are a prognostic factor for cutaneous cell carcinomas of the head and neck.


High Risk Histologic Features is a Registry Data Collection Variable in AJCC. It was previously collected as Skin, CS SSF # 12.


0No high risk histologic features
2Poor differentiation (grade 3)
3Sarcomatoid differentiation
4Undifferentiated (grade 4)
5Multiple high risk histologic features
6Histologic features, NOS (type of high risk histologic feature not specified)
8Not 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)
9Not documented in medical record High risk histologic features not assessed or unknown if assessed

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.