Wim van Harten, MD, PhD from the Netherlands Cancer Institute, Amsterdam, Netherlands discusses drug price differences at the European Cancer Congress of the European Cancer Organisation (ECCO) 2017 in Amsterdam, Netherlands. Listed prices of drugs can vary greatly depending on where they are published. For example, there can be large differences between formal prices and those negotiated in practice. There is a question as to whether these pricing differences may affect the fairness of treatment across European countries.