• Subjects ≥ 65 of age, or ≥ 60 and \< 65 years old who are ineligible for stem cell transplant or have refused stem cell transplantation due to reason(s) including: Have not received prior systemic therapies for MCL.

• Modified Ann Arbor stage II-IV. Patients with stage II require systemic treatment to be eligible, at the discretion of the investigator.

• Histopathological confirmed MCL, expression of Cyclin D1 and/or t (11; 14) chromosomal translocation. Either fresh tissue or FFPE for diagnosis must be sent to central lab for final confirmation after randomization.

• At least one measurable site of disease (the longest axis of the lymph node lesion is \> 1.5 cm, or the longest diameter of the extranodal lesion is \> 1.0 cm).

• ECOG PS score of 0 to 2.