Study of Zevalin Versus Observation in Patients at Least 60 Yrs Old With Newly Diagnosed Diffuse Large B-cell Lymphoma in PET-negative Complete Remission After R-CHOP or R-CHOP-like Therapy

Study of Zevalin Versus Observation in Patients at Least 60 Yrs Old With Newly Diagnosed Diffuse Large B-cell Lymphoma in PET-negative Complete Remission After R-CHOP or R-CHOP-like Therapy