The MC identified 5 WGs:
| WG1: | Identification of reference laboratories/experts of specific solid tumors |
| Co-ordinator: F. MITELMAN | |
| WG2: | Cytogenetics of carcinomas |
| Co-ordinator: P. EDWARDS | |
| WG3: | Mesenchymal tumors |
| Co-ordinator: A. HAGEMEIJER | |
| WG4: | Genome resources for FISH analysis and advanced molecular cytogenetic technologies |
| Co-ordinators: M. ROCCHI and C. BUYS | |
| WG5: | Genetic predisposition and susceptibility to cancer |
| Co-ordinator: O. HAAS | |
Reports of WGs Meeting:
| WG1: | 1st Meeting 21 September, Intra-Verbania (Italy) |
| 2nd Meeting 15 March 2002, Sesimbra (Portugal) | |
| 3rd Meeting 7 July 2002, Barcelona (Spain) | |
| 4rd Meeting 17 July 2004, Prague (Czech Republic) | |
| 5th Meeting 8-11 June 2006, La Grande Motte (France) | |
| WG2: | 1st Meeting 21-22 September 2001, Intra-Verbania (Italy) |
| 2nd Meeting 13 September 2002, Barcelona (Spain) | |
| 3rd Meeting 4-5 July 2003, Gdansk (Poland) | |
| 4th Meeting 21-22 October 2005, Nice (France) | |
| 5th Meeting 8-11 June 2006, La Grande Motte (France) | |
| WG3: | 1st Meeting 30 March 2001, Semmering (Austria) |
| 2nd Meeting 21-22 September 2001, Intra-Verbania (Italy) | |
| 3rd Meeting 13 September 2002, Barcelona (Spain) | |
| 4th Meeting 4 July 2003, Gdansk (Poland) | |
| 5rd Meeting 16-19 September 2004, Brno (Czech Republic) | |
| 6th Meeting 17-19 February 2005, Heidelberg (Germany) | |
| 7th Meeting 21-22 October 2005, Nice (France) | |
| 8th Meeting 8-11 June 2006, La Grande Motte (France) | |
| WG4: | 1st Meeting 30 March 2001, Semmering (Austria) |
| 2nd Meeting 21-22 September 2001, Intra-Verbania (Italy) | |
| 3rd Meeting 15-16 March 2002, Sesimbra (Portugal) | |
| 4th Meeting 13 September 2002, Barcelona (Spain) | |
| 5th Meeting 4-5 July 2003, Gdansk (Poland) | |
| 6rd Meeting 30 April/1 May 2004, Hindsgavl (Denmark) | |
| 7rd Meeting 16-19 September 2004, Brno (Czech Republic) | |
| 8th Meeting 17-19 February 2005, Heidelberg (Germany) | |
| 9th Meeting 8-11 June 2006, La Grande Motte (France) |
| WG5: | 1st Meeting 21-22 September 2001, Intra-Verbania (Italy) |
| 2nd Meeting 13 September 2002, Barcelona (Spain) | |
| 3rd Meeting 6 September 2003, Bologna (Italy) | |
| 4th Meeting 16-19 September 2004, Brno (Czech Republic) | |
| 5th Meeting 17-19 February 2005, Heidelberg (Germany) | |
| 6th Meeting 8-11 June 2006, La Grande Motte (France) |