Throughout its years of scientific activity, CEEEOG has collaborated with a range of institutions and companies, including:

• Breast International Group (BIG)

• Bristol-Myers Squibb

• Celon Pharma

• Cepheid

• European Organisation for Research and Treatment of Cancer

• GlaxoSmithKline (now GSK)

• Hoosier Oncology Group (now Hoosier Cancer Research Network)

• Imperial College London, United Kingdom

• International Breast Study Group (IBCSG) 

• Istituto Toscano Tumori, Italy

• Monogram Biosciences, San Francisco, US

• NanoString

• National Cancer Institute, Bethesda, US

• Novartis

• Roche

• Sheba Medical Center, Israel

• University of Bergen, Norway

• University of Colorado Cancer Center, US