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The physico-chemical properties of PQR620 result in good oral bioavailability and excellent brain penetration^[1]. The activity of PQR620 as single agent undergoes in vivo evaluation in two DLBCL models, the germinal center B cell type DLBCL (GCB-DLBCL) SU-DHL-6 and the acivated B cell-like DLBCL (ABC-DLBCL) RIVA. Treatments with PQR620 (100 mg/kg dose per day, Qd×7/w) start with 100-150 mm³ tumors and are carried for 14 (SU-DHL-6) or 21 days (RIVA). In both models, PQR620 determines a 2-fold decrease of the tumor volumes in comparison with control, with significant differences in both SU-DHL-6 (D7, D9, D11, D14; P<0.005) and RIVA (D14, D16, D19, D21; P<0.005)^[2].