| Greece | Nationwide Registry for Childhood Hematological Malignancies (NARECHEM) | Incidence | 25/11/2021 | 2,393 | 1996-2014 | Cancer registry | |
| Hungary | National Pediatric Cancer Registry of Hungary | Incidence | 25/11/2021 | 9,110 | 1971-2013 | Cancer registry | |
| Italy | Cancer Registry of Basilicata | Incidence | 25/11/2021 | 124 | 2006-2010 | Cancer registry | |
| Italy | Cancer Registry of Bergamo | Incidence | 25/11/2021 | 253 | 2007-2012 | Cancer registry | |
| Italy | Cancer Registry of Cremona | Incidence | 25/11/2021 | 60 | 2005-2010 | Cancer registry | |
| Italy | Cancer Registry of Piacenza | Incidence | 25/11/2021 | 108 | 2006-2014 | Cancer registry | |
| Italy | Cancer Registry of South Tyrol | Incidence | 25/11/2021 | 261 | 1995-2010 | Cancer registry | |
| Italy | Cancer registry of Puglia - Province of Barletta-Andria-Trani | Incidence | 25/11/2021 | 157 | 2006-2012 | Cancer registry | |
| Italy | Cancer Registry of Brescia | Incidence | 25/11/2021 | 488 | 1999-2010 | Cancer registry | |
| Italy | Integrated Cancer Registry of Catania-Messina-Siracusa-Enna | Incidence | 25/11/2021 | 891 | 2003-2013 | Cancer registry | |
| Italy | Cancer Registry of Catanzaro | Incidence | 25/11/2021 | 105 | 2003-2010 | Cancer registry | |
| Italy | Cancer Registry of Como province | Incidence | 25/11/2021 | 229 | 2003-2011 | Cancer registry | |
| Italy | Cancer Registry of Reggio Emilia | Incidence | 25/11/2021 | 359 | 1996-2014 | Cancer registry | |
| Italy | Cancer Registry of Ferrara Province | Incidence | 25/11/2021 | 240 | 1991-2011 | Cancer registry | |
| Italy | Cancer Registry of Friuli Venezia Giulia | Incidence | 25/11/2021 | 621 | 1995-2010 | Cancer registry | |
| Italy | Cancer Registry of Liguria Region | Incidence | 25/11/2021 | 679 | 1986-2010 | Cancer registry | |
| Italy | Cancer Registry of Latina Province | Incidence | 25/11/2021 | 542 | 1990-2012 | Cancer registry | |
| Italy | Cancer Registry of Puglia - Province of Lecce | Incidence | 25/11/2021 | 211 | 2003-2008 | Cancer registry | |
| Italy | Cancer Registry of Macerata Province | Incidence | 25/11/2021 | 113 | 1991-2001 | Cancer registry | |
| Italy | Cancer Registry of Mantova | Incidence | 25/11/2021 | 149 | 1999-2010 | Cancer registry | |
| Italy | Cancer Registry of Monza and Brianza | Incidence | 25/11/2021 | 188 | 2007-2012 | Cancer registry | |
| Italy | Cancer Registry of Milan | Incidence | 25/11/2021 | 593 | 2008-2012 | Cancer registry | |
| Italy | Cancer Registry of Modena | Incidence | 25/11/2021 | 584 | 1988-2013 | Cancer registry | |
| Italy | Cancer Registry of the Campania region | Incidence | 25/11/2021 | 730 | 1996-2013 | Cancer registry | |
| Italy | Cancer Registry of Nuoro | Incidence | 25/11/2021 | 99 | 2003-2012 | Cancer registry | |
| Italy | Cancer Registry of Palermo and province | Incidence | 25/11/2021 | 611 | 2003-2013 | Cancer registry | |
| Italy | Cancer Registry of Parma | Incidence | 25/11/2021 | 518 | 1978-2014 | Cancer registry | |
| Italy | Childhood Cancer Registry of Piedmont | Incidence | 25/11/2021 | 4,943 | 1967-2011 | Cancer registry | |
| Italy | Cancer Registry of Ragusa | Incidence | 25/11/2021 | 507 | 1981-2012 | Cancer registry | |
| Italy | Cancer Registry of Romagna | Incidence | 25/11/2021 | 1,026 | 1986-2014 | Cancer registry | |
| Italy | Cancer Registry of Salerno province | Incidence | 25/11/2021 | 872 | 1996-2010 | Cancer registry | |
| Italy | Cancer Registry of Sassari province | Incidence | 25/11/2021 | 384 | 1992-2011 | Cancer registry | |
| Italy | Cancer Registry of Sondrio province | Incidence | 25/11/2021 | 104 | 1998-2013 | Cancer registry | |
| Italy | Cancer Registry of the Province of Syracuse | Incidence | 25/11/2021 | 212 | 1999-2012 | Cancer registry | |
| Italy | Cancer registry of Puglia - Province of Taranto | Incidence | 25/11/2021 | 225 | 2006-2012 | Cancer registry | |
| Italy | Cancer Registry of Trento | Incidence | 25/11/2021 | 281 | 1995-2010 | Cancer registry | |
| Italy | Cancer Registry of Trapani | Incidence | 25/11/2021 | 159 | 2002-2010 | Cancer registry | |
| Italy | Cancer Registry of Tuscany region | Incidence | 25/11/2021 | 1,212 | 1985-2010 | Cancer registry | |
| Italy | Cancer Registry of Umbria | Incidence | 25/11/2021 | 645 | 1994-2013 | Cancer registry | |
| Italy | Cancer Registry of Varese | Incidence | 25/11/2021 | 1,247 | 1976-2012 | Cancer registry | |
| Italy | Cancer Registry of Veneto | Incidence | 25/11/2021 | 1,723 | 1987-2010 | Cancer registry | |
| Italy | Cancer Registry of Viterbo | Incidence | 25/11/2021 | 56 | 2006-2010 | Cancer registry | |
| Spain | Childhood Cancer Registry of Castilla y León | Incidence | 25/11/2021 | 311 | 2010-2015 | Cancer registry | |
| Spain | Childhood Cancer Registry of Comunitat Valenciana | Incidence | 25/11/2021 | 2,497 | 1990-2010 | Cancer registry | |
| Switzerland | Swiss Childhood Cancer Registry (SCCR) | Incidence | 25/11/2021 | 4,485 | 1990-2013 | Cancer registry | |
