The introduction of radioimmunotherapy (RIT) has exploited the tumor cell targeting ability of mAbs to deliver doses of radiation to the tumor and limited surrounding tissue. This is especially useful in the treatment of NHL because lymphomas are highly sensitive to radiotherapy. 90Yttrium-ibritumomab tiuxetan (Zevalin) is a unique compound composed of the murine IgG1 anti-CD20 antibody ibritumomab, the linker chelator tiuxetan, and the radioisotope 90Y chelated via the linker. 90Y-ibritumomab tiuxetan can be described as providing a double hit therapeutic approach by having the CD20+ antibody properties of rituximab combined with radiation therapy.