Ian T. Magrath DSc (Med), FRCP, FRCPathPresident, International Network for Cancer Treatment and Research, Adjunct Professor of Pediatrics, Uniformed Services University of the Health Sciences, International Network for Cancer Treatment and Research, Brussels, BelgiumSection editors:Kishor Bhatia PhD, FRCPathDirector, AIDS Malignancy ProgramOHAM, NCI, NIHBethesda, MDUSA Paolo Boffetta MD, MPHHead of Environment Section, IARC Lifestyle and Cancer GroupInternational Agency for Research on CancerLyonFranceClaire Dearden BSc, MD, FRCP, FRCPathConsultant HaematologistDepartment of Haemato-OncologyRoyal Marsden NHS Foundation Trust and Institute of Cancer ResearchLondonUKVolker Diehl MD, PhDProfessor of Internal Medicine, Hematology and OncologyHonorary Chairman of German Hodgkin Study Group (GHSG)Former Head of Department I of Internal MedicineUniversity Hospital CologneCologneGermanyRandy D. Gascoyne MD, FRCPCClinical Professor of PathologyDepartment of Pathology and Laboratory MedicineBritish Columbia Cancer Agency and The University of British ColumbiaResearch Director, Centre for Lymphoid CancersSenior Scientist, BC Cancer Research CentreVancouver, BCCanadaHans Konrad Müller-Hermelink Prof. Dr. Dr. h. c.Professor and ChairmanInstitute of PathologyUniversity of WürzburgWürzburgGermanyMichael Potter MDScientist, EmeritusLaboratory of Cell Biology and GeneticsNational Cancer Institute, NIHBethesda, MDUSAAma Z. S. Rohatiner MD, FRCPProfessor of Haemato-OncologyDepartment of Medical Oncology,St. Bartholomew's HospitalLondonUK