RELEVANCE: Phase III randomized study of lenalidomide plus rituximab (R2) versus chemotherapy plus rituximab, followed by rituximab maintenance, in patients with previously untreated follicular lymphoma.

7500Background: Immunochemotherapy induction followed by rituximab maintenance is the standard of care in previously untreated symptomatic FL. Phase II studies of chemo-free combination immunotherapy with lenalidomide and rituximab (R2) show promising activity. Methods: RELEVANCE is a global, randomized, phase III trial (NCT01650701) of R2 vs R-chemo followed by rituximab in previously untreated grade 1-3a FL patients requiring therapy according to GELF criteria. Lenalidomide dose was 20 mg/d, d2-22/28 for 6-12 cycles (c), continued in responders at 10 mg/d for a total of 18 c. Rituximab dose was 375 mg/m2 weekly c1 and d1 c2-6 and continued in responders for 12 additional c (q8wk). R-chemo was given per investigator’s choice of standard R-CHOP, R-bendamustine (R-B), or R-CVP, followed by 12 c of rituximab (q8wk). Co-primary endpoints of CR/CRu at 120 wk and PFS (50% interim analysis by 1999 IWG) are reported here. Results: As of 31May2017, 1030 patients with high tumor burden were randomized to R2 (n = 5...