VELCADE (Bortezomib) for Injection - Phase II Study of Bortezomib and Rituximab in Relapsed or Refractory Non-Hodgkin's Lymphoma

RATIONALE: Bortezomib may stop the growth of cancer cells by blocking some of the enzymes needed for cell growth. Monoclonal antibodies, such as rituximab, can block cancer growth in different ways. Some block the ability of cancer cells to grow and spread. Others find cancer cells and help kill them or carry cancer-killing substances to them. Giving bortezomib together with rituximab may be an effective treatment for non-Hodgkin's lymphoma.

PURPOSE: This phase II trial is studying how well giving bortezomib together with rituximab works in treating patients with relapsed or refractory B-cell non-Hodgkin's lymphoma, including Waldenstrom's macroglobulinemia.