Table 1.

Cancer characteristic categories and code description.

Category	Code	Number of Classes
Basis of Diagnosis	06 – Cytology or Haematology	4
	07 – Histology of metastasis
	08 – Histology of primary
	09 – Autopsy and histology
Histological Type	ICD-O morphology code – M-xxxxx	1036
Histological Grade	1 – Grade 1 – well differentiated	9
	2 – Grade II – moderately differentiated
	3 – Grade III – poorly differentiated
	4 – Grade IV –undifferentiated or anaplastic
	5 – T-cell
	6 – B-cell, Pre-B, B-precursor
	7 – Null cell, Non T, Non-B (For leukaemias only)
	8 – NK Cell
	9 – Grade or differentiation not determined, not stated or not applicable.
Primary Site	ICD-O topography code – Cxx.x	330
Laterality	1 – Right	5
	2 – Left
	3 – Bilateral
	8 – Not applicable
	9 – Unknown
Metastatic Site	Equivalent ICD-O topology code – Cxx.x	See primary site
Metastatic Status	Not applicable or 2 (metastasis)	2