For the 4th Cancer Core Europe TRYTRAC* workshop, 18 ambitious clinical and translational researchers from Europe came together for exchange and training at Gustave Roussy (Villejuif, France).   With the focus on applied immune-oncology, the participants were treated to a comprehensive program at this leadership workshop. In addition to presentations of key researchers from Gustave Roussy, the TRYTRACers had the opportunity to get to know the Gustave Roussy site via a guided tour through the hospital and research laboratories. They got an insight in its structures of patient care and research by visiting the paediatric department, the radiomics department, the chemotherapy [...]