1. Department of Pathology and
2. Leukemia Service, Memorial Sloan-Kettering Cancer Center, New York, NY;
3. Department of Medicine V, University Hospital Heidelberg, Heidelberg, Germany;
4. Department of Molecular Therapy in Hematology and Oncology, National Center for Tumor Diseases and German Cancer Research Center, Heidelberg, Germany;
5. Genome Biology Unit, European Molecular Biology Laboratory, Heidelberg, Germany;
6. Human Oncology and Pathogenesis Program and
7. Center for Molecular Oncology, Memorial Sloan-Kettering Cancer Center, New York, NY;
8. Division of Hematology and Medical Oncology, Mayo Clinic/Mayo Clinic Cancer Center, Scottsdale, AZ;
9. School of Life Sciences, Ulsan National Institute of Science and Technology, Ulsan, Republic of Korea;
10. Division of Hematology, Department of Internal Medicine, The Ohio State University Comprehensive Cancer Center, Columbus, OH;
11. MLL Munich Leukemia Laboratory, Munich, Germany; and
12. Department of Epidemiology and Biostatistics, Memorial Sloan-Kettering Cancer Center, New York, NY