Marie Cecile Le Deley^1*, Angelo Rosolen^2*, Alfred Reiter, MD³, Denise Williams, MD^4*, Keizo Horibe, MD⁵, Grazyna Wrobel^6*, Georg Mann^7*, Jozsef Zsiros^8*, Anne Uyttebroeck^9*, Ildiko Marky^10*, Wolfgang Klapper^11* and Laurence Brugieres^12*

¹Biostatistics and Epidemiology, Institute Gustave Roussy, Villejuif, France
²Pediatric Hematology-Oncology, University of Padova, Padova, Italy
³Dept. of Pediatric Hematology and Oncology, Children's University Hospital, Giessen, Germany
⁴Pediatrics, Addenbrookes Hospital, Cambridge, United Kingdom
⁵Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan
⁶Pediatric Hematology-Oncology, Wroclaw Medical University, Wroclaw, Poland
⁷St. Anna Children's Hospital, Vienna, Austria
⁸Pediatric Hematology-Oncology, AMC, Amsterdam, Netherlands
⁹University Hospital, Leuven, Belgium
¹⁰Pediatrics, Göteborg University, Göteborg, Sweden
¹¹Pathology, Hematopathology Section and Lymph Node Registry, University Hospital Schleswig-Holstein, Kiel, Germany
¹²Pediatrics and Adolescents, Institute Gustave Roussy, Villejuif, France

Michal Sieniawski, MD¹, Nithia Angamuthu^1*, Kathryn Boyd^2*, Richard Chasty^3*, John Davies^4*, Paul Revell^5*, Stephen J Proctor^1* and Anne L Lennard^6*

¹Haematological Sciences, Newcastle University, Newcastle, United Kingdom
²Department of Haematology, Craigavon Area Hospital, Portadown, United Kingdom
³Department of Haematology, University Hospital of North Saffordshire, Stoke on Trent, United Kingdom
⁴Department of Haematology, Western General Hospital, Edinburgh, United Kingdom
⁵Staffordshire General Hospital, Stafford, United Kingdom
⁶Department of Haematology, Royal Victoria Infirmary, Newcastle, United Kingdom

Arnaud Jaccard^1*, Nathalie Gachard^2*, Paul Coppo^3*, Franck Morschhauser^4*, Lionel Galicier^5*, Loic Ysebaert^6*, Philippe Lenain^7*, Bernadette Corront^8*, Felipe Suarez^9*, Jean Feuillard^2*, Philippe Gaulard^10*, Dominique Bordessoule¹ and Olivier Hermine^9*

¹Hematologie clinique, CHU, Limoges, France
²Laboratoire d'hématologie, CHU, Limoges, France
³Hematologie clinique, Hôpital Saint-Antoine, Paris, France
⁴Hematologie clinique, CHU, Lille, France
⁵Immunologie clinique, Hôpital Saint-Louis, Paris, France
⁶CHU Purpan, Service d'Hematologie et Inserm U563, Toulouse, France
⁷Service d'Hématologie, Centre Henri Becquerel, Rouen, France
⁸Centre hospitalier, Annecy, France
⁹Hématologie clinique, Hôpital Necker, Paris, France
¹⁰Département de Pathologie, Hôpital Henri Mondor, Creteil, France

Andres JM Ferreri, MD¹, Michele Reni, M.D.^2*, Marco Foppoli, M.D.^1*, Maurizio Martelli, M.D.^3*, Marina Siakantaris, M.D.^4*, Maurizio Frezzato, M.D.^5*, Maria Giuseppina Cabras, M.D.^6*, Alberto Fabbri, M.D.^7*, Gaetano Corazzelli, M.D.^8*, Fiorella Ilariucci, M.D.^9*, Giuseppe Rossi, M.D.^10*, Riccardo Soffietti, M.D.^11*, Caterina Stelitano, M.D.^12*, Daniele Vallisa, M.D.^13*, Francesco Zaja, M.D.^14*, Marta Gelemur, M.D.^15*, Gian Marco Aondio, M.D.^16*, Giuseppe Avvisati, M.D.¹⁷, Monica Balzarotti, MD^18*, Alba Brandes, M.D.^19*, Maria Joao Costa, MD²⁰, Henry Gomez, M.D.^21*, Attilio Guarini, M.D.^22*, Graziella Pinotti, M.D.^23*, Luigi Rigacci, M.D.^24*, Catrina Uhlmann, M.D.^25*, Maria Angelopoulou, M.D.^26*, Maria Tirindelli, M.D.^27*, Virginia Naso, M.D.^28*, Alberto Franzin, M.D.^29*, Nicoletta Anzalone, M.D.^30*, Maurilio Ponzoni, M.D.^1*, Emanuele Zucca, M.D.^31*, Federico Caligaris-Cappio, M.D.^1* and Franco Cavalli, M.D.^32*

¹Unit of Lymphoid Malignancies, Department of Oncology, Istituto Scientifico San Raffaele, Milano, Italy
²Department of Oncology, San Raffaele Scientific Institute, Milan, Italy
³Hematology, University La Sapienza, Roma, Italy
⁴Laikon General Hospital, Athens, Greece
⁵San Bortolo Hospital, Vicenza, Italy
⁶Hematology, Hospital Businco, Cagliari, Italy
⁷Policlinico Le Scotte, Siena, Italy
⁸Istituto Pascale, Napoli, Italy
⁹Hematology, AO, Reggio Emilia, Italy
¹⁰Department of Hematology, Spedali Civili, Brescia, Italy
¹¹A.O. San Giovanni Battista, Torino, Italy
¹²Intergruppo Italiano Linfomi, Italy
¹³Ospedale Civile, Piacenza, Italy
¹⁴Clinic of Haematology, Chair of Haematology, University of Udine, Udine, Italy
¹⁵GATLA, Grupo Argentino Trataminento de Leucemia Aguda., Buenos Aires, Argentina
¹⁶Gravedona, Como, Italy
¹⁷Università Campus Bio-Medico di Roma
¹⁸Oncology - Hematology, Istituto Clinico Humanitas, Rozzano, Italy
¹⁹Busonera Hospital, Padova, Italy
²⁰Lisbon Hospital, Lisbon, Portugal
²¹Lima Hospital, Lima, Peru
²²On the behalf of Intergruppo Italiano Linfomi (IIL), Hematology,, Bari, Italy
²³UO Oncologia Medica, Ospedale di Circolo Fondazione Macchi, Varese
²⁴Hematology, Azienda Ospedaliero Universitaria Careggi, Florence, Italy
²⁵Kantonospital, Aarau, Switzerland
²⁶Hematology, Athens, Greece
²⁷Campus Biomedico, Roma, Italy
²⁸Università La Sapienza, Roma, Italy
²⁹Division of Neurosurgery, Istituto Scientifico San Raffaele, Milano, Italy
³⁰Neuroradiology, Istituto Scientifico San Raffaele, Milano, Italy
³¹Laboratory of Experimental Oncology and Lymphoma Unit, Oncology Institute of Southern Switzerland (IOSI), Bellinzona, Switzerland
³²Laboratory of Experimental Oncology and Lymphoma Unit, Oncology Institute of Southern Switzerland (IOSI), on behalf of the International Extranodal Lymphoma Study Group, Bellinzona, Switzerland

Richard Delarue^1*, Corinne Haioun^2*, Vincent Ribrag^3*, Pauline Brice^4*, Alain Delmer^5*, Herve Tilly⁶, Gilles Salles⁷, Achiel Van Hoof⁸, Olivier Casasnovas^9*, Nicole Brousse^1*, Francois Lefrere^1* and Olivier Hermine^1*

¹Hopital Necker, Paris, France
²Hopital Henri Mondor, Creteil, France
³Institut Gustave Roussy, Villejuif, France
⁴Hopital Saint Louis, Paris, France
⁵Hopital Robert Debre, Reims, France
⁶Centre Henri Becquerel, Rouen, France
⁷Centre Hospitalier Lyon-Sud, Pierre-Benite, France
⁸A. Z. Sint Jan AV, Brugge, Belgium
⁹CHU, Dijon, France

Christiane Pott^1*, Eva Hoster^2*, Sebastian Böttcher^1*, Reiner Siebert^3*, Wolfram Klapper^4*, Marie Helene Delfau^5*, Michael Unterhalt^2*, Wolfgang Hiddemann², Michael Kneba¹ and Martin Dreyling²

¹2nd Department of Medicine, University Medical Center Schleswig-Holstein, Kiel, Germany
²Department of Internal Medicine III, University of Munich-Hospital Großhadern, Munich, Germany
³Department of Human Genetics, University Medical Center Schleswig-Holstein, Kiel, Germany
⁴Department of Hematopathology, University Medical Center Schleswig-Holstein, Kiel, Germany
⁵Service d'Immunologie Biologique, Hospital Henri Mondor, Creteil, France

Grzegorz S. Nowakowski¹, Matthew J. Maurer^1*, Thomas M. Habermann², Stephen M. Ansell¹, William R. Macon^1*, Kay M. Ristow^1*, Cristine Allmer^1*, Susan L. Slager^1*, Thomas E. Witzig^1* and James R Cerhan²

¹Mayo Clinic, Rochester, MN
²College of Medicine, Mayo Clinic, Rochester, MN

Michael Pfreundschuh, MD, Marita Ziepert^*, Marcel Reiser^*, Viola Poeschel^*, Sibylla Wilhelm^*, Tobias Gaska^*, Michael Heike^*, Norbert Schmitz^*, Christian Ruebe^*, Markus Loeffler^* and Joerg Schubert^*

DSHNHL, Homburg, Germany