 Treatment: Patients in this study will receive bortezomib and rituximab. Both drugs will be administered through intravenous infusions. There are two treatment periods in this study. The first is considered induction therapy where patients will receive bortezomib and rituximab intermittently over an eighteen week period. Lower dosages of rituximab will be given to patients at the beginning of the study to ensure no severe toxicity occurs. Those patients without disease growth after the eighteen weeks of treatments will continue with maintenance therapy. During this time period, patients will be given bortezomib and rituximab for up to one year and a half. Several tests and exams will be conducted throughout the study to closely monitor patients. Treatments will be discontinued due to disease growth or unacceptable side effects. 