Marked differences in practice exist between cancer registries, for example, with respect to data sources, definitions and processing methods.To make cancer registry data comparable, which is one of the main aims of the Network, it is important that common rules and definitions are used. Working Groups have been established to examine specific topics, identified as potentially problematic. These expert working groups are constituted of 3-4 people, selected by the ENCR Steering Committee. Their task is to study the problem and make recommendations for the cancer registries.The following topics have already been discussed:

Working Groups

Topics	Authors	PDF link	Date
Standard dataset		English	10 February 2005
Incidence Date	Dr Derek Pheby, UK Dr Carmen Martínez, Spain Dr Martine Roumagnac, France Dr Leo Schouten, The Netherlands	English French German Spanish	Distributed in 1995 Revised in 1997
Multiple Primaries	from ENCR: Dr Paule-Marie Carli, France Dr Isabel Izarzugaza, Spain Dr Beata Koscianska, Poland	English	Distributed in 1995 Revised in 2000 Revised in 2004
Bladder Tumours	Dr Derek Pheby, UK Dr Martine Sauvage, France Dr Carmen Martínez, Spain Dr Leo Schouten, The Netherlands	English French German Spanish	Distributed in 1995
Tumours of the Brain and Central Nervous System	Dr Derek Pheby, UK Dr M. Sant, Italy Dr J. Ironside, UK Prof. W.M. Molenaar, The Netherlands	English	Distributed in 1998
Leukaemias and Lymphomas	Dr R. Otter, The Netherlands Dr A. Astudillo, Spain Professor P.M. Carli, France Dr A. Jack, UK Dr H. van Krieken, The Netherlands	English
Basis of Diagnosis	Dr J. Smith, UK Dr R. Frost, UK Dr L. Teppo, Finland Dr O. Visser, The Netherlands	English	Distributed in 1999
Non-Melanoma Skin Cancers	Dr T. Davies, UK Mrs M. Page, UK Dr J.W. Coebergh, The Netherlands	English	Distributed in 2000
Method of Detection in Relation to Screening	Dr Leo Schouten, The Netherlands Dr Hannes Botha, UK Dr Eugenio Paci, Italy	English	Distributed in 2001
Confidentiality in Cancer registration	Dr Hans Storm, Denmark Dr Eva Buiatti, Italy Dr Timo Hakulinen, Finland Dr Hartwig Ziegler, Germany	English French	Distributed in 2002
Condensed TNM for Coding the Extent of Disease	Dr F. Berrino, Italy Dr C. Brown, UK Dr T. Möller, Sweden Dr L. Sobin, USA With: Dr J. Faivre, France	English French	Distributed in 2002