September is blood cancer awareness month. Leukemia is the broad term for blood cancer, and just in Switzerland, there are more than 1000 new cases listed per year. It is also the most common childhood cancer (1). The diversity of leukemia and the ineffectiveness of current treatments call for new treatments tailored to each individual, using the patient's own tumor cells. Zebrafish are interesting for personalized medicine due to their similarities with human genetics and physiology. In fact, about 70% of human disease genes have an equivalence in zebrafish (2). …