Po/99/02.2 The recording of "WHO grade (malignancy scale)"

Po/99/02 ENCR recommendations for the registration of tumours of the Brain and Nervous System Site: CNS
Implementation date: 01/01/2000
Implement from diagnosis date: 01/01/2000

Agreed by: UKACR EC

Date agreed by: 08/02/2000The ENCR recommendations are available as Appendix Po/99/02. At the C&CG meeting these were discussed. Po/99/02.1 Which tumours to register
This has been archived.
Po/99/02.2 The recording of "WHO grade (malignancy scale)" The
C&CG foresaw problems with the implementation of this
recommendation. In the first place, the use of the term "grade" to
describe the behaviour of a tumour is potentially confusing, given that
"grade" traditionally is defined as referring to the morphological
differentiation of a tumour. The Group recommends that the ENCR be
asked to use a different term.
Secondly, while some
registries have a field for "grade" from which information is submitted
to ONS, it is important to realise that ONS expects information on
morphological differentiation and not on tumour behaviour in that
field. The C&CG therefore recommends that registries should be
careful not to do that. Registries are also advised not to use the
sixth digit of the ICD-O morphology code for describing the behaviour
of CNS tumours.

It was agreed that the grade table in ICD-O3, which has been expanded
to include other morphology codes should be implemented by all
registries. For some of the tumours, in WHO-4, there is a new proposed
code. It was agreed that this code should not be used until ICD-04 is
published. The table has been added without the WHO-4 codes.
Agreed by UKACR EC: 31/10/2008 Implement from: Refer to table
Po/99/02.3 Coding of obsolete terms and new terms
This has been archived.