With two regularly approved CD19 CAR T-cell treatments, Yi Lin, MD, PhD, Mayo Clinic, Rochester, MN, speaks on the importance of real-world data. So far, there are comparable side effects in terms of cytokine release syndrome, neurotoxicity, as well as, clinical response. This interview took place at the 24th Congress of the European Hematology Association (EHA) 2019, held in Amsterdam, Netherlands.