Rituximab Plus Lenalidomide for Patients With Relapsed / Refractory Indolent Non-Hodgkin's Lymphoma (Follicular Lymphoma and Marginal Zone Lymphoma)

Inclusion Criteria:

• Age ≥18 years at the time of signing the informed consent document.
• Understand and voluntarily sign an informed consent document prior to any studyrelated assessments/procedures are conducted.
• Histologically confirmed marginal zone lymphoma or follicular lymphoma (grade 1, 2 or 3a; CD20+ by flow cytometry or histochemistry).
• Previously treated with at least one prior systemic chemotherapy, immunotherapy orchemoimmunotherapy and have received at least 2 previous doses of rituximab.
• Documented relapsed, refractory or progressive disease after treatment with systemictherapy and must not be rituximab-refractory.
• Investigator considers rituximab monotherapy appropriate.
• Bi-dimensionally measurable disease on cross sectional imaging by X-ray computedtomography (CT) or magnetic resonance imaging (MRI).
• Need of treatment for relapsed, progressed or refractory disease as assessed by theinvestigator.
• Eastern Cooperative Oncology Group (ECOG) performance status ≤ 2.
• Adequate bone marrow function.
• Willingness to follow study visit schedule, pregnancy precautions and other protocolrequirements.

Exclusion Criteria:

• Histology other than follicular or marginal zone lymphoma or clinical evidence oftransformation or Grade 3b follicular lymphoma.
• Subjects taking corticosteroids during the last week prior to study treatment, unlessadministered at a dose equivalent to < 20 mg/day prednisone or prednisolone.
• Systemic anti-lymphoma therapy within 28 days or use of antibody agents within 8 weeksuse of radioimmunotherapy within 6 months.
• Known seropositive for or active viral infection with hepatitis B virus (HBV) or/andhuman immunodeficiency virus (HIV).
• Known hepatitis C virus (HCV) positive with chronic HCV or active viral infection withHCV hepatitis requiring anti-viral medication (at time of randomization).
• Life expectancy < 6 months.
• Known sensitivity or allergy to murine products.
• Prior history of malignancies, other than follicular or marginal zone lymphoma, unlessthe subject has been free of the disease for ≥ 5 years.
• Prior use of lenalidomide.
• Known allergy to thalidomide.
• Neuropathy > Grade 1.
• Presence or history of central nervous system involvement by lymphoma.
• Subjects who are at a risk for a thromboembolic event and are not willing to takeprophylaxis for it.
• Uncontrolled intercurrent illness.
• Any significant medical condition, laboratory abnormality, or psychiatric illness thatwould prevent the subject from signing the informed consent document.
• Pregnant or lactating females.
• Any condition that places the subject at unacceptable risk if he/she were toparticipate in the study or that confounds the ability to interpret data from thestudy.