X Paoletti1, S Postel-Vinay2. 1. Biostatistics and Epidemiology Unit, Gustave Roussy; INSERM CESP OncoStat, Paris Saclay University, Villejuif. Electronic address: xavier.paoletti@gustaveroussy.fr. 2. Drug Development Unit (DITEP), Gustave Roussy; INSERM UMR981, Paris Saclay University, Villejuif, France.