Rituximab and Combination Chemotherapy With or Without Lenalidomide in Treating Patients With Newly Diagnosed Stage II-IV Diffuse Large B Cell Lymphoma

Inclusion Criteria: * PRE-REGISTRATION (STEP 0) * Histologically confirmed DLBCL expressing CD20 antigen; patients with transformed lymphoma are excluded; in this regard, patients with composite lymphoma in the diagnostic tissue (concomitant DLBCL and follicular or other low-grade lymphoma component) are excluded; however, patients with DLBCL in primary diagnostic tissue but a bone marrow that shows low grade or indeterminate lymphoma are eligible; patients with known primary mediastinal large B-cell lymphoma (PMLBCL) are excluded; similarly, patients with known c-myc translocation (by fluorescence in situ hybridization) positive DLBCL are encouraged to participate in trials specifically designed for these patients; however patients with known c-myc DLBC positive are NOT excluded from this study; c-myc testing prior to study enrollment is NOT required * Stages II bulky disease (defined as mass size of more than 10 cm), stage III, or IV (Ann Arbor staging); patients with stage I and stage II non-bulky disease are excluded from this study * A paraffin-embedded tumor tissue specimen from the initial diagnostic biopsy has been located and ready to ship to the Mayo Clinic Lymphoma Laboratory following pre-registration; Note: excisional tumor biopsy is preferred; core needle biopsies will be considered adequate if there is enough tissue for the mandatory central pathology review immunohistochemistry and Genomics Education Partnership (GEP); submission of a tumor block is preferred…