Test presentation
It is well known that the newer treatments for multiple myeloma that use humanized monoclonal antibodies (mAbs) can interfere with the patient’s native antibodies in immunofixation tests. This can mislead the pathologist in interpreting the patient’s response to treatment. Immunofixation is one of the tests referenced in the IMWG (International Myeloma Working Group) guidelines to establish the diagnosis of complete response in a patient with multiple myeloma.