The following academic groups, which conduct research into the treatment and prevention of cancer, are participating in the ALTTO trial.

ABCSG	Austrian Breast & Colorectal Cancer Study Group
ACCOG	Anglo Celtic Cooperative Oncology Group
AGO	Arbeitsgemeinschaft Gynäkologische Onkologie
ANZ BCTG	Australian New Zealand Breast Cancer Trials Group
BIG	Breast International Group
BOOG	Borstkanker Onderzoek Groep Dutch Breast Cancer Trialists' Group
BREAST	Breast European Adjuvant Study Team
CALGB	Cancer and Leukemia Group B
DBCG	Danish Breast Cancer Cooperative Group
ECOG	Eastern Cooperative Oncology Group
EORTC BCG	European Organization for Research and Treatment of Cancer Breast Cancer Group
FNCLCC	Fédération Nationale des Centres de Lutte Contre le Cancer Federation of French Cancer Centers
GBG	German Breast Group
GBECAM	Grupo Brasileiro de Estudos do Câncer de Mama Brazilian Breast Cancer Study Group
GECO PERU	Grupo de Estudios Clinicos Oncológicos Peruano
GOCCHI	Grupo Oncológico Cooperativo Chileno de Investigación Chilean Cooperative Group for Oncologic Research
GOIRC	Gruppo Oncologico Italiano di Ricerca Clinica Italian Oncology Group for Clinical Research
IBCSG	International Breast Cancer Study Group
ICORG	All Ireland Cooperative Oncology Research Group
ICR-CTSU	Institute of Cancer Research-Clinical Trials and Statistics Unit
IBCG	Israeli Breast Cancer Group
JBCRG	Japan Breast Cancer Research Group
KCSG	Korean Cancer Study Group
NBCG	Norsk Bryst Cancer Gruppe Norwegian Breast Cancer Group
NCCTG	North Central Cancer Treatment Group
NCIC CTG	National Cancer Institute of Canada, Clinical Trials Group
NCRI	National Cancer Research Institute
NOGGO	Nord-Ostdeutsche Gesellschaft für Gynäkologische Onkologie Northeast German Society for Gynecologic Oncology
SOLTI	Grupo Español de Estudio, Tratamiento y Otras Estrategias Experimentales en Tumores Sólidos SOLid Tumor Intensification Group
SUCCESS	SUCCESS-Studie
SWOG	Southwest Oncology Group
TCOG	Taiwan Cooperative Oncology Group
WSG	Westdeutsche Studien Gruppe West German Study Group
YBCRG	Yorkshire Breast Cancer Research Group