Interplay between alemtuzumab, IL7, host immune system and UCART19 kinetics. Individual host T profiles up to day 60, highlighted by expansion status (A), relationship between alemtuzumab total exposure and host T early AUC (AUC0-28; B), higher host T early exposures are correlated with the absence of observable UCART19 expansion (C), IL7 exposure AUC28 and host T early exposure AUC0-28 are strongly correlated (D). Individual host NK profiles up to day 60, highlighted by expansion status (E), relationship between alemtuzumab total exposure and host NK early AUC (AUC0-28; F), absence of correlation between host NK early exposures and UCART19 expansion (G), absence of correlation between IL7 exposure AUC28 and host NK early exposure AUC0-28 (H). Statistical comparison was performed using a Wilcoxon test for C and G and a Spearman correlation for B, D, F, and H.