Inclusion Criteria:

- Mantle cell lymphoma (MCL) confirmed with histology, immunophenotype, and cyclin D1
analysis

- Received 2 to 7 prior therapies which may include hematopoietic stem cell transplant
(i.e. induction + consolidation + maintenance)

- Prior treatment with an alkylating agent and an anthracycline, rituximab,
individually or in combination, and status that is at least one of the following:

- Primary disease refractory to at least 2 regimens;

- Refractory to at least 1 regimen after first relapse;

- Refractory or untreated after second or greater relapse;

- Refractory to first line and relapsed after second line. Chemotherapy combinations
may include, but are not limited to: CHOP (Cyclophosphamide, doxorubicin,
vincristine, prednisone), R-CHOP (Rituximab, Cyclophosphamide, doxorubicin,
vincristine, prednisone), FCM (Fludarabine, cyclophosphamide, mitoxantrone), R-FCM
(Rituximab,Fludarabine, cyclophosphamide, mitoxantrone), ICE(Ifosfamide, carboplatin,
etoposide), DHAP (Dexamethasone, cisplatin, cytarabine) and hyper-CVAD
(Cyclophosphamide, doxorubicin, vincristine, dexamethasone).

Exclusion Criteria:

- Subjects who are less than or equal to six month from allogeneic hematopoietic stem
cell transplant and who are on immunosuppressive therapy or have evidence of graft
versus host disease

- Prior investigational therapy within 3 weeks of first dose. Investigational therapy
is defined as treatment that is not approved for any indication.

- Active central nervous system (CNS) metastases, as indicated by clinical symptoms,
cerebral edema, requirement for corticosteroids and/or progressive growth. (Treated
CNS metastases must be stable for > 2 weeks prior to Day 1.)