The incidence of cancer rises sharply since 30 years among young Europeans. The growth rate of 1% per year for children and 1,5% for teenagers. The study of the International Research on Cancer (Lyon) has just published "The Lancet" has used data records in pediatric 63 19 1970 European countries to 2001. Either 113.000 cases of tumors in children and in adolescents 18.243. During this period, the cure rate has increased sharply: in 70 years, less than one in two children were alive after five years; the proportion is now three out of four children. Environmental factors may be involved, but other explanations are sometimes complementary advances. The authors of the study are careful to settle the question of the causes of this development. The Chernobyl disaster could explain much of the increase in cancers in the countries of the East, but it is not enough in itself to understand this evolution. To read the study on the website of "Lancet" (in English, free registration required) cliquer ici.