Finally, at both 48 h and 72 h, ATM-3507 inhibited the growth of SU-DHL-8 GCB-DLBCL cells by 50% at a concentration of ~200 nM (Figure 4D), with higher ATM-3507 concentrations causing greater growth arrest at 72 h than at 48 h (Figure 4D). This evidence concerns the gene ATM and diffuse large B-cell lymphoma.