Description: This is an open-label, randomized study for people with relapsed, follicular B-cell lymphoma. Volunteers at least 18 who have histologically confirmed follicular B-cell lymphoma, have a B-cell population that is CD-20 positive, have received prior therapy for the condition, and do not have CNS lymphoma, chronic lymphocytic leukemia, or small lymphocytic lymphoma may be eligible. The research sites are located across the United States.