Why don't cancer doctors prescribe zevalin (ibritumomab tiuxetan)?

Used. Doctors do prescribe zevalin (ibritumomab tiuxetan) (ibritumomab). It is a useful medication, but the dosing involved a complex test dosing which was doable, but not available at all centers. That is better now. Also there is not "head-to-head" data vs the "naked" cd20 monoclonal antibody Rituximab vs. Zevalin, (ibritumomab tiuxetan) so some data are hard to interpret. It if more often used as consolidation or relapse therapy.
WE DO. Zevalin (ibritumomab tiuxetan) is used with certain lymphomas. It is not a first line therapy so it is given after other treatments have been given. Plus, there are other treatments which an oncologists may find more appropriate.
Zevalin (ibritumomab tiuxetan) Zevalin (ibritumomab tiuxetan) ( ibritumomab) is a radioimmuntherapy used to treat certain cases of lymphoma. Cancer docs do use/prescribe zevalin (ibritumomab tiuxetan) in the right setting. Not as a first line treatment. It is mainly used in relapse or refractory disease.

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Why don't doctors prescribe bexxar (tositumomab) and zevalin for cancer?

Wrong assumption. Bexxar (tositumomab) and Zevalin are indeed commonly prescribed for some cases of lymphoma. Those drugs have no beneficial activity (but do have harm) when used to treat most other cancers, such as lung, breast, and colon cancer. Read more...