CD276 and neoplasm: We noticed that enriched CD123-B7H3 T cells also showed in vitro cytotoxicity at the highest T cell to tumor ratio of 20:1, suggesting a low level of leaky expression of B7H3 CAR (Supplementary Fig. 9a); however, this did not translate to an in vivo impact and did not result in T-cell trafficking at disease sites (Fig. 5g and Supplementary Fig. 9b).