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Behavior: How a tumor acts; for example, benign, malignant (noninvasive or invasive), or metastatic.

Abstractor Notes
Behavior codes (See Behavior section in ICD-O-3, Table 18th) /0-Benign /1-Uncertain whether benign or malignant /2-Carcinoma in situ /3-Malignant, primary site /6*- Malignant, metastatic site /9*-Malignant, uncertain whether primary or metastatic site *Not used by cancer registrars