CD7 and neoplasm: This reduction was observed in an E:T-ratio-dependent manner in various CD7-positive cell lines, but not the CD7-negative cell line U937 (Figures 2C and 2D), with a mean tumor cell lysis of 74.5% for Ramos.CD7, 69.3% for CEM, 77.8% for Hut78, and 64.0% for Molt-4 (Figure 2D).