Rituximab, Lenalidomide, and Ibrutinib in Treating Patients With Previously Untreated Stage II-IV Follicular Lymphoma

PRIMARY OBJECTIVE: I. To determine the recommended phase II doses of ibrutinib and lenalidomide for combination with rituximab in previously untreated follicular lymphoma. SECONDARY OBJECTIVES: I. To determine pharmacokinetics of ibrutinib and its major metabolite (PCI-45227) when combined with lenalidomide and rituximab. II. To determine the pharmacodynamics of basophil activation and Bruton tyrosine kinase (BTK) occupancy in peripheral blood mononuclear cells (PBMCs) over a 24-hour period of ibrutinib when given in combination with lenalidomide and rituximab. OUTLINE: This is a dose-escalation study of lenalidomide and ibrutinib. Patients receive lenalidomide orally (PO) once daily (QD) on days 1-21 and ibrutinib PO QD on days 1-28. Treatment repeats every 28 days for up to 18 cycles in the absence of disease progression or unacceptable toxicity. Patients also receive rituximab intravenously (IV) on days 1, 8, 15, and 22 of cycle 1 and once weekly at weeks 13, 21, 29, and 37. After completion of study treatment, patients are followed up every 4 months for 2 years and then every 6 months for 8 years or every 6 months or annually for 10 years.