- Histologically confirmed diagnosis of classical Hodgkin's lymphoma or NHL (follicular, DLBCL, or mantle cell) and confirmed relapsed or refractory disease. 1)Subjects with a diagnosis of classical Hodgkin's lymphoma MUST have relapsed following a prior autologous, allogeneic or reduced intensity allogeneic stem cell transplant. Subjects who received an allogeneic transplant must have no evidence of graft versus host disease (GVHD), and have discontinued treatment with immunosuppressive agents ≥ 3 months prior to enrollment in this study. 2)Subjects with DLBCL must be ineligible for, or have refused, autologous stem cell transplant, or have relapsed following transplant. 3)Subjects with MCL must have relapsed after prior treatment and not be eligible for autologous stem cell transplant (ASCT) or have relapsed following ASCT. 4)Subjects with NHL who may have received a prior allogeneic stem cell transplant must have no evidence of GVHD, and have discontinued treatment with immunosuppressive agents ≥ 3 months prior to enrollment in this study.