- Patients are required to have histologically confirmed lymphoma according to the WHO/Revised European-American Lymphoma classification, including B-cell small lymphocytic lymphoma (SLL); marginal zone lymphoma (MZL); follicular lymphoma (FL), grades 1, 2, or 3; mantle cell lymphoma (MCL); and Waldenström macroglobulinemia. Prior history of transformed lymphoma is permitted as long as recent biopsies revealed no evidence of aggressive lymphoma and it has been > 3years since prior aggressive lymphoma