164 Participating Centers in 39 Countries (1000 Researchers and Associates) are cooperating in the European Leukemia Net, funded by the 6th Framework Program of the European Community. It aims to strengthen and develop scientific and technological excellence in research and therapy of leukemia (CML, AML, ALL, CLL, MDS, CMPD) by integration of the leading national leukemia networks and their interdisciplinary partner groups in Europe.