Phase Ib/II Study of the Efficacy and Safety of the R-CMC544/R-GEMOX Combination in Diffuse Lage B-cell Lymphoma at First or Second Relapse

This study is a multicenter, phase Ib/II, open-label, single arm trial evaluating the efficacy and safety of R-CMC544 alternated with R-GEMOX in patients with CD20 and CD22 positive DLBCL in relapse after/refractory to 1st or 2nd line treatment, who are no candidates for autologous transplant. The study consists of 2 phases. In part 1 (potential dose de-escalation phase) subjects will be enrolled at a fixed dose of CMC544. In case of occurrence of dose limiting toxicity (DLT), cohorts of 3 to 6 subjects will evaluate a de-escalating dose of CMC544 in combination with set doses of rituximab, gemcitabine and oxaliplatin in order to obtain the MTD or recommended dose of CMC544 in this regimen. In part 2 (dose expansion phase) further safety and preliminary efficacy data of the proposed combination will be analyzed. All patients will receive two 56 day induction cycles of alternating R-CMC544 (given on day 1) and R-GEMOX (given on day 29 and 43). Patients who obtain CR or PR, will then go on a consolidation of another two 56 day cycles of alternating R-CMC544 (given on day 1) and R-GEMOX (given on day 29 and 43).