CAR T-cell immunotherapy is designed with different targets depending on the receptors they will bind to. CARs can also contain different tools, like the concept of a Swiss army knife, with several utensils for different tasks. The goal is to make them more effective and durable. During the second session of the Spotlight on Immuno-Oncology conference, “Novel CAR designs and approaches,” Robbie Majzner, of Stanford University, described expanding the main components of CAR T cells to acquire new functions and act on different cell pathways.