This Trial is a Prospective Observational Study of Newly Diagnosed Diffuse Large B Cell Primary Breast Lymphomas

Inclusion Criteria: * Previously untreated patients with DLBCL of the breast. * Patients must have CD20 positive tumors. * Stage IE or IIE. * Must have at least one objective measurable or evaluable disease. Baseline measurements and evaluations must be obtained within 4 weeks of registration to the study. * Patients must have an ECOG performance status 0-2. * Patients must have adequate organ function as evidenced by the following laboratory studies ( within 2 weeks prior to registration): * Creatinine Clearance \> 50 ml/min * Total bilirubin \< 2.0 mg/dl and AST \< 2 x upper limit of normal. If documented hepatic involvement with lymphoma, total bilirubin can be \< 3 x ULN, and AST \< 5 x ULN. * Absolute neutrophil count \> 1500/mm3 and platelet count \> 100,000/mm3. If documented bone marrow involvement with lymphoma, absolute neutrophil count \> 500/mm3 and platelet count \> 50,000/mm3. * Patients must be age \> 18 years. * Patients must have a normal left ventricular ejection fraction to be eligible. Exclusion Criteria: * historical or radiographic evidence of CNS metastasis including previously treated, resected or asymptomatic brain lesions or leptomeningeal involvement. * pregnant or breast feeding patients. Women of childbearing potential and sexually active males are strongly advised to use an accepted and effective method of contraception. * active infection requiring parental antibiotics. * known HIV infection