The Development of IgE Multiple Myeloma Following Treatment for Locally Advanced Prostate Cancer.

This case report documents the diagnosis of multiple myeloma (MM) in a 74-year-old man following treatment for locally advanced prostate cancer. It is important to include MM in the differential diagnosis when the patient presents with nonspecific symptoms such as back pain, anemia, and renal impairment in the absence of a prominent increase in prostate-specific antigen (PSA). The present case was diagnosed as IgE MM with a poor prognosis. Prompt diagnosis and intervention of MM is necessary to avoid complications, including renal impairment.