The HT score stratifies patients with severe neutropenia after CART. (A) Aggregate ANC over time (day −6 until 120) per neutrophil recovery phenotype: quick recovery (n = 134 [55%]), intermittent recovery (n = 56 [23%]), and aplastic (n = 55 [22%]). (B) Relative incidences of neutrophil recovery phenotypes (quick recovery, intermittent recovery, and aplastic), split for HT^low and HT^high patients. (C) Percentages of patients receiving G-CSF after CAR T-cell infusion, split for HT^low and HT^high patients. (D) Relative incidences of early and late ICAHT severity, split for HT^low and HT^high patients. (E) Aggregate ANC over time (day −6 until 120), split for HT^low and HT^high patients. (F) Total duration of neutropenia between days 0 and 60 divided by a low vs high HT score. (G) ROC curve of the continuous HT score for the end point clinically significant neutropenia (ANC of ≤500/uL for ≥14 days). ROC, receiver operating characteristic.