Stefan Sleijfer, MD, PhD, is medical oncologist and Head of the Department of Medical Oncology of the Erasmus MC. He is an active member of several scientific Societies, among which: chair of the Center for Personalised Cancer Treatment (CPCT), and Chair of the “route Personalized Medicine” of the Dutch Science Agenda advising the Dutch government for research funding. Prof. Sleijfer has been involved in the scientific organisation of numerous conferences and workshops and is section editor “Sarcoma, Endocrine and other Rare Tumors” for the European Journal of Cancer. His research topics focus on: Translational Oncology – Establishment of prognostic and predictive markers in solid malignancies in particular circulating tumour cells, cell-free DNA and circulating endothelial cells. He has authored and co-authored over 300 publications and has given over a 150 presentations.