This is a Phase 1, open-label, multicenter study evaluating the safety, pharmacokinetic profile, and preliminary efficacy of ABT-199 in combination with Bendamustine/Rituximab in approximately 60 subjects with relapsed or refractory non-Hodgkin's lymphoma. This study will evaluate the safety and pharmacokinetic profile of ABT-199 in approximately 60 subjects when administered in combination with Bendamustine/Rituximab following a dose escalation scheme, with the objective of defining the dose limiting toxicity and the maximum tolerated dose.

Inclusion Criteria:

• Subject must have histologically documented diagnosis of non-Hodgkin's lymphoma as defined by a B-cell neoplasm in the World Health Organization classification scheme except as noted in exclusion criteria.
• Subject (non-diffuse large B-cell lymphoma) must have relapsed or refractory non-Hodgkin's lymphoma, and require treatment in the opinion of the investigator.
• Subject with diffuse large B-cell lymphoma must have relapsed diffuse large B-cell lymphoma or must have progressed after salvage therapy (with or without standard chemotherapy) for diffuse large B-cell lymphoma. The subject must have received first line therapy with Rituximab-Cyclophosphamide, Hydroxydaunomycin, Vincristine (Oncovin), Prednisone (R-CHOP) [or a similar standard rituximab-containing front-line chemoimmunotherapy regimen including, but not limited to Etoposide, Prednisone, Vincristine (Oncovin), Cyclophosphamide, Doxorubicin (Hydrochloride) + Rituximab (EPOCH + R); Rituximab, Cyclophosphamide, Etoposide, Procarbazine, Prednisone (RCEPP); Rituximab, Cyclophosphamide, Mitoxantrone (Novantrone), Vincristine (Oncovin), Prednisone (RCNOP); Dose-adjusted-Etoposide, Prednisone, Vincristine(Oncovin), Cyclophosphamide, Doxorubicin (Hydrocloride) (DA-EPOCH); and Rituximab, Cyclophosphamide, Etoposide, Vincristine (Oncovin), Prednisone (RCEOP)].
• Subject must have adequate coagulation, renal, and hepatic function, per laboratory reference range at Screening.

Exclusion Criteria:

• Subject has been diagnosed with Post-Transplant Lymphoproliferative Disease, Burkitt's lymphoma, Burkitt-like lymphoma, lymphoblastic lymphoma/leukemia, chronic lymphocytic leukemia, small lymphocytic lymphoma or mantle cell lymphoma (MCL).

• Subject has refractory diffuse large B-cell lymphoma, defined as meeting any of the following criteria:

  • Subject progressed during or within 3 months of completion of a planned course of first-line therapy with Rituximab-Cyclophosphamide, Hydroxydaunomycin, Vincristine (Oncovin), Prednisone (R-CHOP) or an equivalent regimen;
  • Subject had no response (i.e., stable disease only) to first-line therapy with R-Cyclophosphamide, Hydroxydaunomycin, Vincristine (Oncovin), Prednisone (R-CHOP) or an equivalent regimen;
  • Subject progressed during or within 2 months of completion of their last planned course of salvage therapy with chemotherapy (with or without rituximab, may include autologous stem cell transplant).

• Subject has tested positive for human immunodeficiency virus (HIV).

• Subject has a cardiovascular disability status of New York Heart Association Class greater or equal to 2. Class 2 is defined as cardiac disease in which patients are comfortable at rest but ordinary physical activity, results in fatigue, palpitations, dyspnea or anginal pain.

• Subject has a significant history of renal, neurologic, psychiatric, endocrinologic, metabolic, immunologic, or hepatic disease that in the opinion of the Investigator would adversely affect his/her participating in this study.