 3. Patients with histologically confirmed aggressive hematologic malignancies with chemotherapy-refractory disease. Chemotherapy refractory disease is defined as one or more of the following: Stable disease or progressive disease as best response to most recent chemotherapy containing regimen or disease progression or recurrence within 12 months of prior Autologous or allogeneic stem cell transplant. Subjects must have received adequate prior therapy including at a minimum: anti-CD20 monoclonal antibody unless tumor is CD20-negative, an anthracycline containing chemotherapy regimen. Subjects with transformed FL must have received prior chemotherapy for follicular lymphoma and subsequently have chemo-refractory disease after transformation to diffuse large B-cell lymphoma DLBCL. 