This is a multi-center prospective, observational real-world study, targeting patients with B-cell non-Hodgkin's lymphomas. This study is designed to evaluate the efficacy and safety of lenalidomide single drug or lenalidomide combined with rituximab (with or without other drugs) in the real-world setting.~This study will mainly focus on the following three cohorts:~Cohort 1: patients diagnosed with CD20-positive diffuse large B-cell lymphoma; Cohort 2: patients diagnosed with CD20-positive follicle lymphoma; Cohort 3: patients on maintenance treatment who have achieved complete remission or partial remission after induction therapy.
Describe the treatment of B-cell non-Hodgkin lymphoma patients who receive lenalidomide single drug or lenalidomide combined with rituximab (with or without other drugs), and evaluate the efficacy and safety of lenalidomide single drug or lenalidomide combined with rituximab (with or without other drugs) in the real-world setting.