 The United Kingdom Children's Cancer Study Group had been founded in 1977 when a number of paediatricians who had been treating children with cancer joined together to form a national group.The UK Childhood Leukaemia Working Party was formed around the same time.From small beginnings, there has been steady expansion so that CCLG now has over 600 members, working in a network of 21 Paediatric Oncology Centres throughout the United Kingdom and Ireland, and including over 70 corresponding members from other countries around the world.