Having direct responsibility in research programs directed to develop personalized and innovative treatment plans, he served as the Study Chair of phase II as well as international large randomized phase III trials focusing on the treatment of breast cancer in all the disease settings. He has authored approximately 300 publications in peer-reviewed journals.

Dr. Colleoni was Chair of Breast cancer, early stage Track at the ESMO 2016 Congress having served in other Breast cancer tracks in previous ESMO meetings.