Zinaida Good, PhD, Stanford University, Stanford, CA, talks on the use of single-cell technologies to decipher the mechanisms of resistance to chimeric antigen receptor (CAR) T-cell therapy. Dr Good explains that measuring a large number of markers provides a better understanding of these mechanisms. For instance, a marker of T-cell senescence, CD57, was included in a recent study investigating which intrinsic features of CAR T-cells correlated with durable response, and unexpectedly emerged as the strongest association with treatment response. This interview took place during the 36th Society for Immunotherapy of Cancer (SITC) Annual Meeting in Washington, D.C.