Study Groups

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This page contains information on various current and historical study groups. Definitions of acronyms are also available at the glossary. Additional links and resources are here, courtesy of ESMO. We have a separate page for professional organizations.
=Main table=
This table contains a listing of study groups that we are aware of, organized by their focus and their region. The table can be sorted by any of the columns. If you find a group to be missing from the table, please let us know about it! Links and information about years of operation will be added over time.
Focus 	Acronym 	Expanded name 	Country/Region 	Years of operation
Breast cancer and Colorectal cancer	ABCSG 	Austrian Breast and Colorectal Cancer Study Group 	Austria 	1984
Neuro-oncology 	ABTC 	Adult Brain Tumor Consortium 	United States 	2009-
General cancer 	ACCOG 	Anglo-Celtic Cooperative Oncology Group 	United Kingdom 	
General cancer 	ACOSOG 	American College of Surgeons Oncology Group 	United States 	Unknown-2014
General cancer 	AERO 	Association Européenne de Recherche en Oncologie 	Europe 	
Gastrointestinal oncology 	AGITG 	Australasian Gastro-Intestinal Cancer Trials Group 	Australia 	
General cancer 	AGMT 	Arbeitsgemeinschaft Medikamentöse Tumortherapie 	Austria 	
Gynecologic oncology 	AGO-OVAR 	Arbeitsgemeinschaft Gynäkologische Onkologie Studiengruppe Ovarialkarzinom 	Germany 	
Breast cancer 	AGO-B Study Group 	Arbeitsgemeinschaft Gynäkologische Onkologie-Breast Study Group 	Germany 	Unknown-2010
General cancer 	AIO 	Arbeitsgemeinschaft Internistische Onkologie 	Germany 	1976
Thoracic oncology 	AIOT 	Associazione Italiana Oncologia Toracica 	Italy 	
Hematology 	ALLG 	Australasian Leukaemia and Lymphoma Group 	Australia 	1973
General cancer 	Alliance 	Alliance for Clinical Trials in Oncology 	United States 	2014
Gastrointestinal oncology 	ALM-CAO 	Arbeitsgruppe Lebermetastasen und-tumoren in der Chirurgischen Arbeitsgemeinschaft Onkologie 	Germany 	
HIV-associated malignancy 	AMC 	AIDS Malignancy Consortium 	United States 	1995
Acute myeloid leukemia 	AMLSG 	German-Austrian AML Study Group 	Germany & Austria 	
Breast cancer 	ANZ BCTG 	Australian-New Zealand Breast Cancer Trials Group 	Australia & New Zealand	1978
Gynecologic oncology 	ANZGOG 	Australia and New Zealand Gynecological Oncology Group 	Australia & New Zealand	
Genitourinary oncology 	AUO 	German Association of Urological Oncology 	Germany 	
Breast cancer 	BCIRG 	Breast cancer International Research Group 	International 	
Thoracic oncology 	BCTG 	Bronchial Carcinoma Therapy Group 	 	
Breast cancer 	BIG 	Breast International Group 	International 	
Multiple myeloma 	BMMSG 	Brazilian Multiple Myeloma Study Group 	Brazil 	
Transplant 	BMT CTN 	Blood and Marrow Transplant Clinical Trials Network 	United States 	
Lymphoma 	BNLI 	British National Lymphoma Investigation 	United Kingdom 	
Breast cancer 	BOOG 	Dutch Breast Cancer Research Group 	Netherlands 	
Thoracic oncology 	BTOG 	British Thoracic Oncology Group 	United Kingdom 	
General cancer 	CALGB 	Cancer and Leukemia Group B - now merged into The Alliance for Clinical Trials in Oncology. 	United States 	1956-2014
Pediatrics 	CCG 	Children's Cancer Group 	United States 	1955-2000
General cancer 	CECOG 	Central European Cooperative Oncology Group 	Europe 	
Lymphoma 	CLG 	Central Lymphoma Group UK 	United Kingdom 	
Pediatrics 	COG 	Children's Oncology Group 	United States 	2000-
Hematology 	COSAH 	Cooperative Study Group A for Hematology 	 	
General cancer 	CRUK 	Cancer Research UK 	United Kingdom 	2002
Genitourinary oncology 	CUETO 	Club Urológico Español De Tratamiento Oncológico 	Spain 	
Breast cancer 	DBCG 	Danish Breast Cancer Cooperative Group 	Denmark 	1975
Colorectal cancer 	DCCG 	Dutch Colorectal Cancer Group 	Netherlands 	
Leukemia 	DCLSG 	Dutch Childhood Leukemia Study Group 	Netherlands 	1972-2001
Pediatrics 	DCOG 	Dutch Childhood Oncology Group 	Netherlands 	2001-
Dermatologic oncology 	DeCOG 	Dermatologic Cooperative Oncology Group 	Germany 	1991
Lymphoma 	DSHNHL 	German High-Grade Non-Hodgkin Lymphoma Study Group 	Germany 	
General cancer 	ECOG 	Eastern Cooperative Oncology Group 	United States 	1955-2015
General cancer 	ECOG-ACRIN 	Eastern Cooperative Oncology Group-American College of Radiology Imaging Network 	United States 	2012
Thoracic oncology 	ELCWP 	European Lung Cancer Working Party 	Europe 	
Gynecologic oncology 	ENGOT 	European Network for Gynaecological Oncological Trial groups 	Europe 	2007
General cancer 	EORTC 	European Organisation for Research and Treatment of Cancer 	Europe 	1962
Gynecologic oncology 	EORTC-GCG 	European Organization for Research and Treatment of Cancer – Gynecologic Cancer Group 	Europe 	
Pancreatic cancer 	ESPAC 	European Study Group for Pancreatic Cancer 	Europe 	
Gastrointestinal oncology 	FFCD 	Fédération Francophone de Cancérologie Digestive 	France 	
Chronic myeloid leukemia 	Fi-LMC 	France Intergroupe des Leucémies Myéloïdes Chroniques (French Chronic Myeloid Leukemia Study Group) 	France 	
Lymphoma 	FIL 	Fondazione Italiana Linfomi 	Italy 	
General cancer 	FNCLCC 	Federation Nationale des Centres de Lutte Contre le Cancer 	France 	1964
Chronic lymphocytic leukemia 	FRE-CLL 	French Cooperative Group on Chronic Lymphocytic Leukaemia 	France 	
Leukemia 	GATLA 	Grupo Argentino de Tratamiento de Leucemia Aguda 	Argentina 	1967
Breast cancer 	GBG 	German Breast Group 	Germany 	2003
Gynecologic oncology 	GCIG 	Gynecologic Cancer Intergroup 	International 	
Chronic lymphocytic leukemia 	GCLLSG 	German CLL Study Group 	Germany 	
Breast cancer 	GEICAM 	Grupo Español de Investigación en Cáncer de Mama (Spanish Research Group on Breast Cancer) 	Spain 	
Ovarian cancer 	GEICO 	Grupo Espanol de Investigacion en Cancer de Ovario 	Spain 	1999
Lymphoma/Transplant 	GEL/TAMO 	Grupo Español de Linfomas/Trasplante Autólogo de Médula Osea 	Spain 	
Lymphoma 	GELA 	Groupe d'Etude des Lymphomes de l'Adulte 	France 	
Lymphoma 	GELCAB 	Grup d’Estudi dels Limfomes de Catalunya i Balears 	Spain 	
Myeloma 	GEM 	Grupo Español de Mieloma 	Spain 	
General cancer 	GERCOR 	Group Coopérateur Multidisciplinaire en Oncologie (Multidisciplinary Group in Oncology) 	France 	1997
Genitourinary oncology 	GETUG 	Urogenital Tumor Study Group 	France 	1994
Leukemia 	GFM 	Groupe Francophone des Myelodysplasies 	France 	
Thoracic oncology 	GFPC 	Groupe Français de Pneumo-Cancérologie 	France 	
Classical Hodgkin lymphoma 	GHSG 	German Hodgkin's Lymphoma Study Group 	Germany 	
Breast cancer 	GIM 	Gruppo Italiano Mammella 	Italy 	
Hematology 	GIMEMA 	Gruppo Italiano Malattie Ematologiche Maligne dell'Adulto 	Italy 	1982
Ovarian cancer 	GINECO 	Group d'Investigateurs Nationaux pour l'Etude des Cancers Ovariens 	France 	
Gastrointestinal oncology 	GISCAD 	Italian Group for the Study of Digestive Tract Cancer 	Italy 	
General cancer 	GIVIO 	Gruppo Interdisciplinare Valutazione Interventi in Oncologia 	Italy 	
Hematology 	GLATHEM 	Grupo Latinoamericano de Tratamiento de Hemopatias Malignas 	Argentina 	1973
Thoracic oncology 	GLOT 	Groupe Lyon-Saint-Etienne d'Oncologie Thoracique 	France 	
Lymphoma 	GLSG 	German Low-Grade Lymphoma Study Group 	Germany 	
General cancer 	GOCCHI 	Grupo Oncologico Cooperativo Chileno De Investigacion 	Chile 	1998
General cancer 	GOCS 	Grupo Oncologico Cooperativo del Sur 	Argentina 	1978
Lymphoma 	GOELAMS 	Groupe Ouest-Est d'études des Leucémies Aigües et autres Maladies du Sang 	France 	
Gynecologic oncology 	GOG 	Gynecologic Oncology Group 	United States 	1970
General cancer 	GOIM 	Gruppo Oncologico Dell’Italia Meridionale 	Italy 	
General cancer 	GOIRC 	Gruppo Oncologico Italiano di Ricerca Clinica (Italian Oncology Group for Clinical Research) 	Italy 	2015
General cancer 	GONO 	Gruppo Oncologico Nord-Ouest (North-West Oncology Group) 	Italy 	
General cancer 	GOSCI 	Gruppo Oncologico Centro-Sud-Isole 	Italy 	
Acute lymphoblastic leukemia 	GRAALL 	Group of Research on Adult ALL 	 	
Breast cancer 	GROCTA 	Gruppo di Ricerca per la Chemio-Ormonoterapia Adiuvante (Breast Cancer Adjuvant Chemo-Hormone Therapy Cooperative Group)	Italy 	1982
Sarcoma 	GSF-GETO 	Groupe Sarcome Français 	France 	
General cancer 	HeCOG 	Hellenic Cooperative Oncology Group 	Greece 	1990
General cancer 	HOG 	Hoosier Oncology Group 	United States 	1984
General cancer 	HORG 	Hellenic Oncology Research Group 	Greece 	1986
General cancer 	HOVON 	Dutch Haemato-Oncology Cooperative Study Group 	The Netherlands 	1985
Breast cancer 	IBCSG (formerly LCBS) 	International Breast Cancer Study Group (formerly known as the Ludwig Breast Cancer Study Group) 	International 	1978-
General cancer 	ICCG 	The International Collaborative Cancer Group 	International 	
Ovarian cancer 	ICON 	International Collaborative Ovarian Neoplasm Group 	International 	
General cancer 	ICORG 	The All-Ireland Clinical Oncology Research Group 	Ireland 	
Lymphoma 	IELSG 	International Extranodal Lymphoma Study Group 	International 	
Thoracic oncology 	IFCT 	Intergroupe Francophone de Cancérologie Thoracique (French Thoracic Cooperative Group) 	France 	
Multiple myeloma 	IFM 	Intergroupe Francophone du Myélome 	France 	
Leukemia 	JALSG 	Japan Adult Leukemia Study Group 	Japan 	1987
General cancer 	JCOG 	Japan Clinical Oncology Group 	Japan 	1978
General cancer 	JFMC 	Japanese Foundation for Multidisciplinary Treatment of Cancer 	Japan 	
Gynecologic oncology 	JGOG 	Japanese Gynecologic Oncology Group 	Japan 	1982
Pancreatic cancer 	JSAP 	Japanese Study Group of Adjuvant Therapy for Pancreatic Cancer 	Japan 	
General cancer 	KCSG 	Korean Cancer Study Group 	Korea 	1946
Acute lymphoblastic leukemia 	LALA 	French Group of Therapy of Adult Acute Lymphoblastic Leukemia 	France 	
Leukemia 	LCG 	Leukaemia Cooperative Group 	 	
Thoracic oncology 	LLCG 	Leuven Lung Cancer Group or London Lung Cancer Group 	Belgium 	
Lymphoma 	LYSA 	Lymphoma Study Association 	Europe 	2012
Lymphoma 	LYSARC 	Lymphoma Academic Research Organization 	Europe 	2000
General cancer 	MCSGO 	Multi-center Clinical Study Group of Osaka 	Japan 	
Breast cancer 	MIG 	Mammella Inter Gruppo 	Italy 	
Gynecologic oncology 	MITO 	Multicentre Italian Trials in Ovarian Cancer and Gynecologic Malignancies Group 	Italy 	
Neuro-oncology 	NABTT 	New Approaches to Brain Tumor Therapy CNS Consortium 	United States 	1994-2009
General cancer 	NCCTG 	North Central Cancer Treatment Group 	United States 	1977
General cancer 	NCIC-CTG 	National Cancer Institute of Canada Clinical Trials Group 	Canada 	1980
General cancer 	NEJ 	North-East Japan Study Group 	Japan 	
Thoracic oncology 	NLCSG 	Norwegian Lung Cancer Study Group 	Norway 	
Lymphoma 	NLG 	Nordic Lymphoma Group 	Nordic region 	
Multiple myeloma 	NMSG 	Nordic Myeloma Study Group 	Nordic region 	
Gynecologic oncology 	NOGGO 	Nord-Ostdeutsche Gesellschaft Für Gynäkologische Onnologie (North-East German Society of Gynecological Oncology) 	Germany 	1998
General cancer 	NRG Oncology 	Not an acronym per se; represents the incorporation of NSABP, RTOG, and GOG 	United States 	2014
Breast cancer and Colorectal cancer	NSABP 	National Surgical Adjuvant Breast and Bowel Project 	United States 	1957
Gynecologic oncology 	NSGO 	Nordic Society of Gynecologic Oncology 	Nordic region 	1986
General cancer 	OSHO 	Ostdeutsche Studiengruppe Hamato-Onkologie (East German Study Group of Hematology and Oncology) 	Germany 	
Leukemia 	PALG 	Polish Adult Leukemia Group 	Poland 	1974
Hematology 	PETHEMA 	Programa para el Estudio de la Terapéutica en Hemopatía Maligna 	Spain 	1973
Pediatrics 	POG 	Pediatric Oncology Group 	United States 	
Radiation oncology 	RTOG 	Radiation Therapy Oncology Group 	United States 	1968
General cancer 	SAKK 	Swiss Group for Clinical Cancer Research 	Switzerland 	1965
Breast cancer 	SBG 	Scandinavian Breast Group 	Nordic region 	
General cancer 	SECSG 	Southeastern Cancer Study Group 	United States 	
Pediatrics 	SFCE (formerly known as SFOP)	Société Française des Cancers de l'Enfant et l'adolescent (French Society of Pediatric Oncology) 	France 	2003-
Transplant 	SFGM 	Société Française de Greffe de Moelle 	France 	
Radiation Oncology 	SFRO 	Société Francophone de Radiothérapie Oncologique 	France 	1990
Genitourinary oncology 	SFUO 	Swedish Association for Urological Oncology 	Sweden 	
Gynecologic oncology 	SGCTG 	Scottish Gynaecological Cancer Trials Group 	United Kingdom 	
General cancer 	SICOG 	Southern Italy Cooperative Oncology Group 	Italy 	
Thoracic oncology 	SLCG 	Spanish Lung Cancer Group 	Spain 	
Thoracic oncology 	SLCSG 	Swedish Lung Cancer Study Group 	Sweden 	
Genitourinary oncology 	SOGUG 	Spanish Oncology Genitourinary Group 	Spain 	
Genitourinary oncology 	SPCG 	Scandinavian Prostatic Cancer Group 	Nordic region 	
Lymphoma 	StiL 	Study Group indolent Lymphomas 	Europe 	
Breast cancer 	SweBCG 	Swedish Breast Cancer Group 	Sweden 	
General cancer 	SWOG 	Southwest Oncology Group 	United States 	1956
General cancer 	TCOG 	Tokyo Cooperative Oncology Group 	Japan 	
Multiple myeloma 	TMSG 	Turkish Myeloma Study Group 	Turkiye 	
General cancer 	TOG 	Turkish Oncology Group 	Turkiye 	
Radiation Oncology 	TROG 	Trans-Tasman Radiation Oncology Group 	Australia & New Zealand	1989
Gastrointestinal oncology 	TTD 	Spanish Cooperative Group for Gastrointestinal Tumor Therapy 	Spain 	
General cancer 	UK MRC 	United Kingdom Medical Research Council 	United Kingdom 	1913
General cancer 	UK NCRI 	United Kingdom National Cancer Research Institute 	United Kingdom 	
General cancer 	UNICANCER 	National Federation of French Cancer Centres 	France 	1945
General cancer 	WJOG 	West Japan Oncology Group 	Japan 	2004
Thoracic oncology 	WJTOG 	West Japan Thoracic Oncology Group 	Japan 	
Waldenström macroglobulinemia 	WMCTG 	Waldenström's Macroglobulinemia Clinical Trials Group 	United States 	
General cancer 	WSG 	West German Study Group 	Germany 	
=Cooperative groups=
To be reorganized and integrated with the above table.
*ACCOG: Anglo-Celtic Cooperative Oncology Group
*ACOSOG: American College of Surgeons Oncology Group
*ACTION: Alliance for Clinical Trials in Oncology
*AERO: Association Européenne de Recherche en Oncologie
*AGMT: Arbeitsgemeinschaft Medikamentöse Tumortherapie
*AIO: Arbeitsgemeinschaft Internistische Onkologie
*CALGB: Cancer and Leukemia Group B
*CECOG: Central European Cooperative Oncology Group
*CRUK: Cancer Research UK
*ECOG: Eastern Cooperative Oncology Group
*ECOG-ACRIN: Eastern Cooperative Oncology Group-American College of Radiology Imaging Network
*EORTC: European Organisation for Research and Treatment of Cancer
*FNCLCC: Federation Nationale des Centres de Lutte Contre le Cancer
*GERCOR: Group Coopérateur Multidisciplinaire en Oncologie (Multidisciplinary Group in Oncology)
*GIVIO: Gruppo Interdisciplinare Valutazione Interventi in Oncologia
*GOIM: Gruppo Oncologico Dell’Italia Meridionale
*GOIRC: Gruppo Oncologico Italiano di Ricerca Clinica (Italian Oncology Group for Clinical Research)
*GONO: Gruppo Oncologico Nord-Ouest (North-West Oncology Group)
*GOSCI: Gruppo Oncologico Centro-Sud-Isole
*HeCOG: Hellenic Cooperative Oncology Group
*HOG: Hoosier Oncology Group
*HORG: Hellenic Oncology Research Group
*HOVON: Hemato-Oncologie voor Volwassenen Nederland (Dutch Haemato-Oncology Cooperative Study Group)
*ICCG: The International Collaborative Cancer Group
*JACCRO: Japan Clinical Cancer Research Organization
*JCOG: Japan Clinical Oncology Group
*JFMC: Japanese Foundation for Multidisciplinary Treatment of Cancer 
*KCSG: Korean Cancer Study Group
*MCSGO: Multi-center Clinical Study Group of Osaka
*NCCTG: North Central Cancer Treatment Group
*NCIC-CTG: National Cancer Institute of Canada Clinical Trials Group
*NEJ: North-East Japan Study Group
*OSHO: Ostdeutsche Studiengruppe Hamato-Onkologie (East German Study Group of Hematology and Oncology)
*SAKK: Swiss Group for Clinical Cancer Research
*SECSG: Southeastern Cancer Study Group
*SICOG: Southern Italy Cooperative Oncology Group
*SWOG: Southwest Oncology Group
*TCOG: Tokyo Cooperative Oncology Group
*TOG: Turkish Oncology Group
*UK MRC: United Kingdom Medical Research Council
*UK NCRI: United Kingdom National Cancer Research Institute
*UNICANCER: National Federation of French Cancer Centres
*WJOG: West Japan Oncology Group
*WSG: West German Study Group
==Hematology-focused==
*ALLG: Australasian Leukaemia and Lymphoma Group
*COSAH: Cooperative Study Group A for Hematology
*GIMEMA: Gruppo Italiano Malattie Ematologiche Maligne dell'Adulto
*PETHEMA: Programa para el Estudio de la Terapéutica en Hemopatía Maligna
==Pediatrics-focused==
*AIEOP: Associazione Italiana di Ematologia ed Oncologia Pediatrica
*CCG: Children's Cancer Group
*CCCG: Chinese Children’s Cancer Group
*COG: Children's Oncology Group
*DCOG: Dutch Childhood Oncology Group
*GPOH: German Society of Pediatric Oncology and Hematology
*POG: Pediatric Oncology Group
*SFCE: Société Française des Cancers de l'Enfant et l'adolescent (French Society of Pediatric Oncology)
*SFOP: Société Française d'Oncologie Ped́iatrique
*UKCCSG: United Kingdom Children's Cancer Study Group
==Radiation oncology-focused==
*RTOG: Radiation Therapy Oncology Group
*SFRO: Société Francophone de Radiothérapie Oncologique
*TROG: Trans-Tasman Radiation Oncology Group
==Other==
*ESHO: European Society for Hyperthermic Oncology
=Domain-specific study groups=
==Breast oncology==
*ABCSG: Austrian Breast and Colorectal Cancer Study Group
*AGO-B Study Group: Arbeitsgemeinschaft Gynäkologische Onkologie-Breast Study Group
*ANZ BCTG: Australian-New Zealand Breast Cancer Trials Group
*BCIRG: Breast Cancer International Research Group
*BIG: Breast International Group
*BOOG: Dutch Breast Cancer Research Group
*DBCG: Danish Breast Cancer Cooperative Group
*IBCSG: International Breast Cancer Study Group
*GABG: German Adjuvant Breast Cancer Group
*GBG: German Breast Group
*GEICAM: Grupo Español de Investigación en Cáncer de Mama (Spanish Research Group on Breast Cancer)
*GIM: Gruppo Italiano Mammella
*GROCTA: Gruppo di Ricerca per la Chemio-Ormonoterapia Adiuvante (Breast Cancer Adjuvant Chemo-Hormone Therapy Cooperative Group)
*LCBS: Ludwig Breast Cancer Study Group
*MIG: Mammella Inter Gruppo
*NSABP: National Surgical Adjuvant Breast and Bowel Project
*SBG: Scandinavian Breast Group
*SweBCG: Swedish Breast Cancer Group
==Dermatologic oncology==
*DeCOG: Dermatologic Cooperative Oncology Group
==Gastrointestinal oncology==
*AGITG: Australasian Gastro-Intestinal Cancer Trials Group
*ALM-CAO: Arbeitsgruppe Lebermetastasen und-tumoren in der Chirurgischen Arbeitsgemeinschaft Onkologie
*CLIP: Cancer of the Liver Italian Programme
*FFCD: Fédération Francophone de Cancérologie Digestive
*GISCAD: Gruppo Italiano per lo Studio dei Carcinomi dell'Apparato Digerente (Italian Group for the Study of Digestive Tract Cancer)
*TTD: Spanish Cooperative Group for Gastrointestinal Tumor Therapy
===Colorectal cancer===
*ABCSG: Austrian Breast and Colorectal Cancer Study Group
*DCCG: Dutch Colorectal Cancer Group
*NSABP: National Surgical Adjuvant Breast and Bowel Project
===Hepatocellular carcinoma===
*GRETCH: Groupe d'Etude et de Traitement du Carcinome Hépatocellulaire
*SASL: Swiss Association for the Study of the Liver
===Pancreatic cancer===
*ESPAC: European Study Group for Pancreatic Cancer
*JSAP: Japanese Study Group of Adjuvant Therapy for Pancreatic Cancer
==Genitourinary oncology==
*ANZUP: Australian and New Zealand Urogenital and Prostate Cancer Trials Group
*AUO: German Association of Urological Oncology
*CUETO: Club Urológico Español De Tratamiento Oncológico
*GETUG: Genitourinary Group
*SFUO: Swedish Association for Urological Oncology
*SOGUG: Spanish Oncology Genitourinary Group
===Prostate cancer===
*SPCG: Scandinavian Prostatic Cancer Group
===Testicular cancer===
*GTCSG: German Testicular Cancer Study Group
*SGCCCG: Spanish Germ Cell Cancer Cooperative Group
==Gynecologic oncology==
*AGO: Arbeitsgemeinschaft Gynäkologische Onkologie
*ENGOT: European Network for Gynaecological Oncological Trial groups
*GCIG: Gynecologic Cancer Intergroup
*GINECO: 
*GOG: Gynecologic Oncology Group
*JGOG: Japanese Gynecologic Oncology Group
*MITO: Multicentre Italian Trials in Ovarian Cancer and Gynecologic Malignancies Group
*NOGGO: Nord-Ostdeutsche Gesellschaft Für Gynäkologische Onnologie (North-East German Society of Gynecological Oncology)
===Ovarian cancer===
*ICON: International Collaborative Ovarian Neoplasm Group
==Head & neck cancer==
*GORTEC: Groupe d'Oncologie Radiothérapie Tête Et Cou (French Head and Neck Oncology and Radiotherapy Group)
*GSTTC: Gruppo di Studio Tumori della Testa e del Collo
*TTCC: El Grupo Español de Tratamiento de Tumores de Cabeza y Cuello (Spanish Head and Neck Cancer Cooperative Group)
==HIV-associated malignancy==
*AMC: AIDS Malignancy Consortium
==Leukemia==
*ALCCSGA: Acute Leukemia Chemotherapy Cooperative Study Group A
*ALGB: Acute Leukemia Group B
*ALLG: Australasian Leukaemia and Lymphoma Group
*DCLSG: Dutch Childhood Leukemia Study Group
*FILO: French Innovative Leukemia Organization
*GFM: Groupe Francophone des Myelodysplasies
*JALSG: Japan Adult Leukemia Study Group
*LCG: Leukaemia Cooperative Group or Lederle Cooperative Group
*PALG: Polish Adult Leukemia Group
===Acute lymphoblastic leukemia===
*GMALL: German Multicenter Study Group for Adult Acute Lymphoblastic Leukemia
*GRAALL: Group of Research on Adult ALL
*LALA: French Group of Therapy of Adult Acute Lymphoblastic Leukemia
===Acute myeloid leukemia===
*AMLSG: German-Austrian AML Study Group
*GOELAM: Groupe Ouest Est Leucémies Aiguës Myéloblastiques
===Acute promyelocytic leukemia===
*EAPLG: European APL Group
===Chronic myeloid leukemia===
*Fi-LMC: France Intergroupe des Leucémies Myéloïdes Chroniques (French Chronic Myeloid Leukemia Study Group)
==Lymphoma==
*BNLI: British National Lymphoma Investigation
*CLG: Central Lymphoma Group UK
*DSHNHL: German High-Grade Non-Hodgkin Lymphoma Study Group
*GELA: Groupe d'Etude des Lymphomes de l'Adulte
*GELCAB: Grup d’Estudi dels Limfomes de Catalunya i Balears
*GEL/TAMO: Grupo Español de Linfomas/Trasplante Autólogo de Médula Osea
*GITIL: Gruppo Italiano per lo Studio dei Linfomi
*GLSG: German Low-Grade Lymphoma Study Group
*GOELAMS: Groupe Ouest-Est d'études des Leucémies Aigües et autres Maladies du Sang
*GOTEL: Spanish Lymphoma Oncology Group
*IELSG: International Extranodal Lymphoma Study Group
*IIL: Intergruppo Italiano Linfomi
*LYSA: Lymphoma Study Association
*LYSARC: Lymphoma Academic Research Organization
*NLG: Nordic Lymphoma Group
*StiL: Study Group indolent Lymphomas
*UKLG: United Kingdom Lymphoma Group
===Chronic lymphocytic leukemia===
*FRE-CLL: French Cooperative Group on Chronic Lymphocytic Leukaemia
*GFLLC: Groupe Français d'étude de la Leucémie Lymphoïde Chronique
*GCLLSG: German CLL Study Group
===Classical Hodgkin lymphoma===
*GHSG: German Hodgkin's Lymphoma Study Group
===Waldenström macroglobulinemia===
*WMCTG: Waldenström's Macroglobulinemia Clinical Trials Group
==Multiple myeloma==
*BMMSG: Brazilian Multiple Myeloma Study Group
*GEM: Grupo Español de Mieloma
*IFM: Intergroupe Francophone du Myélome
*NMSG: Nordic Myeloma Study Group
*TMSG: Turkish Myeloma Study Group
==Neuro-oncology==
*BTCG: Brain Tumor Cooperative Group
*LWNO: Dutch Neuro-Oncology Group
*NABTT: New Approaches to Brain Tumor Therapy CNS Consortium
*NCBTSG: Nordic Clinical Brain Tumour Study Group
*NOA: Neurooncology Working Group of the German Cancer Society
==Sarcoma==
*EORTC-STBSG: European Organisation for Research and Treatment of Cancer Soft Tissue and Bone Sarcoma Group
*GSF-GETO: Groupe Sarcome Français
==Thoracic oncology==
*AIOT: Associazione Italiana Oncologia Toracica
*BCTG: Bronchial Carcinoma Therapy Group
*BTOG: British Thoracic Oncology Group
*ELCWP: European Lung Cancer Working Party
*GFPC: Groupe Français de Pneumo-Cancérologie
*GLOT: Groupe Lyon-Saint-Etienne d'Oncologie Thoracique
*IFCT: Intergroupe Francophone de Cancérologie Thoracique (French Thoracic Cooperative Group)
*ILCP: Italian Lung Cancer Project
*LLCG: Leuven Lung Cancer Group or London Lung Cancer Group
*NLCSG: Norwegian Lung Cancer Study Group
*SLCG: Spanish Lung Cancer Group
*SLCSG: Swedish Lung Cancer Study Group
*WJTOG: West Japan Thoracic Oncology Group
==Transplant and cellular therapy==
*BMT CTN: Blood and Marrow Transplant Clinical Trials Network
*CGTSG: Cooperative German Transplant Study Group
*EBMT: European Society for Blood and Marrow Transplantation
*GITMO: Gruppo Italiano Trapianto di Midollo Osseo
*MAG: Group Myelome-Autogreffe
*SFGM: Société Française de Greffe de Moelle
*SFGM-TC: Société Française de Greffe de Moelle et de Thérapie Cellulaire