BIG Breast International Group
We will find a cure for breast cancer through global research and collaboration.



BIG network = 56 member groups covering over 55 countries


With breast cancer being the most common cancer in women worldwide, global collaboration and a shared vision are necessary to fight this devastating disease efficiently.

1. BIG members 
2. Membership benefits  
3. The role of BIG members 
4. How to become a member?


1. BIG members

BIG encompasses 56 member groups worldwide, which are breast cancer focused collaborative research groups or data centres. Some BIG groups are regional, some are national and several are international. Each is associated with several to several hundred member hospitals and investigators. This represents several thousand institutions worldwide.

ABCSG Austrian Breast & Colorectal Cancer Study Group
AGO-B  Arbeitsgemeinschaft Gynäkologische Onkologie Breast Study Group
ANZBCTG Australia & New Zealand Breast Cancer Trials Group
ARCAGY-GINECO Association de Recherche dans les Cancers dont Gynécologiques – Groupe d’Investigateurs Nationaaux pour l’Etude des Cancers Ovariens et du sein
BIEI Breast Intergroup of Eastern India
BGICS Breast Gynecological International Cancer Society
BOOG Borstkanker Onderzoek Groep
CCTG Canadian Cancer Trials Group
CEEOG Central and East European Oncology Group
Cancer Trials Ireland Cancer Trials Ireland
CTRG Cancer Therapeutics Research Group
DBCG Danish Breast Cancer Cooperative Group
EORTC BCG European Organisation for Research and Treatment of Cancer Breast Cancer Group
FBCG Finnish Breast Cancer Group
FBI Francilian Breast Intergroup
GAICO Grupo Argentino de Investigación Clínica en Oncología
GBECAM Grupo Brasileiro de Estudos do Câncer de Mama
GBG   German Breast Group
GECO PERU Grupo de Estudios Clinicos Oncologicos Peruano
GEICAM Grupo Español de Investigación en Cáncer de Mama
GOCCHI Chilean Cooperative Group for Oncologic Research
GOCUR Grupo Oncológico Cooperativo Uruguayo
GOIRC Gruppo Oncologico Italiano di Ricerca Clinica
GONO Gruppo Oncologico del Nord Ovest

Hellenic Breast Surgeons Society

HeCOG Hellenic Cooperative Oncology Group
HKBOG Hong Kong Breast Oncology Group
HORG Hellenic Oncology Research Group
IBCG Icelandic Breast Cancer Group
IBCSG International Breast Cancer Study Group
IBG Israeli Breast Group
IBIS  International Breast Cancer Intervention Studies
ICCG International Collaborative Cancer Group
ICON ARO Indian Co-operative Oncology Network
ICRC Iranian Cancer Research Center
ICR-CTSU Institute of Cancer Research - Clinical Trials & Statistics Unit
IJB / CTSU Institut Jules Bordet Clinical Trials Support Unit (formerly BrEAST)
IOSG Indian Oncology Study Group
ITMO   Italian Trials in Medical Oncology
JBCRG Japan Breast Cancer Research Group
LACOG   Latin American Cooperative Oncology Group
MICHELANGELO Fondazione Michelangelo
NBCG Norwegian Breast Cancer Group
NCRI-BCSG National Cancer Research Institute - Breast Cancer Clinical Studies Group
SABO Swedish Association of Breast Oncologists
SAKK Swiss Group for Clinical Cancer Research
SBCG Sheba Breast Collaborative Group
SweBCG Swedish Breast Cancer Group
SKMCH & RC Shaukat Khanum Memorial Cancer Hospital & Research Centre
SLO Société Luxembourgeoise d’Oncologie
TCOG Taiwan Cooperative Oncology Group
TROG Trans-Tasman Radiation Oncology Group
UCBG Unicancer Breast Group
WSG Westdeutsche Studiengruppe


2. Membership benefits

Individual research groups can benefit from BIG in the following ways:

  • Discuss research issues with breast cancer opinion leaders from 56 research groups from around the world

  • Access promising new drugs through BIG clinical trials

  • Contribute to faster accrual, especially in niche patient populations and, thus to faster answers to study questions

  • Help change medical practice by working together with, but independentle from, industry partners that can deliver new drugs to the market

  • Participate in cutting-edge translational research related to BIG trials, including access to biological specimens on a competitive, peer-reviewed basis

  • Access to BIG know-how for the conduct of large global registration trials

  • Linking to other important stakeholders in the research process, such as patient advocates and cancer societies

Members can also access BIG Headquarters services such as the following:

  • Support for the planning and organisation of meetings and arrangements for presenting at BIG scientific meetings

  • Support for taskforces and committees

  • Access to a communications infrastructure supporting BIG research activities

  • Support for contracts and general trial budgets

 3. The role of BIG members

Each member group is represented within the BIG network by one voting and several non-voting delegates.

The final decision-making body of BIG is its General Assembly, consisting of the member groups embodied by their voting representatives.

The General Assembly meets once per year, usually during the ASCO Annual Meeting in June.

Find here BIG's Guidelines for Voting Representatives.


4. How to become a member?

Membership to BIG is open to breast cancer focused collaborative research groups or data centres from around the world. It allows its members to interact regularly and to collaborate in clinical trials and translational research. 

Groups interested in joining BIG should review BIG's Mission & Principles of Research Conduct, BIG's Legal Statutes, and submit a Membership Application Form. You can request the form in WORD version from

According to BIG's procedures, membership applications are only discussed once a year during our General Assembly that is held in June during ASCO. Membership applications for 2016 are open. Applications will be discussed during our General Assembly at ASCO (June 2016). Kindly send us your application latest by 15 March 2016.



If you have any questions about the application process contact:

Ms Carla Saravia


Breast International Group (BIG)-aisbl
Blvd de Waterloo 121
B-1000 Brussels, Belgium
+32 2 486 16 02

Scroll to top

Contact us

Breast International Group (BIG)-aisbl Blvd de Waterloo 121 B-1000 Brussels | Belgium VAT BE 0468 176 240