Childhood cancers are rare, and today 75% of patients survive them. An estimated one out of 850 French persons has survived childhood cancer. However, the complications of chemotherapy, radiotherapy or surgery can lead to a higher risk of secondary mortality, which the literature estimates is at 14%. Regular care has a positive impact on the quality of life and health of adults who survived cancer during their childhoods. It aims to detect the potential long-lasting effects of cancer and to provide therapeutic education and psychological care. Thanks to cancer registries, several countries (USA, Canada, UK, Germany, the Netherlands) have developed long-term care structures which function with specially trained adult medicine practitioners. There are only two structures in France: the Long-Term Oncology/Hematology Follow-Up Clinic, headed by Dr François Pein, in Nantes (France), and the LEA program for the follow-up of children treated for leukemia in the PACA-Corse and Lorraine regions of France, which began in 2003 and has since been extended to other centers.