The name for a group of subfields describing the type and behavior of the tumor being reported using ICD-O-1 codes.

Group names appear only in the data dictionary and Appendix E.

Subfields
Histology (73-91) ICD-O-1 [1971]
Behavior (73-91) ICD-O-1 [1972]
Grade (73-91) ICD-O-1 [1973]