A 67-year-old man has had increasing weakness, fatigue, and weight loss over the past 5 months. He now has decreasing vision in both eyes and has headaches and dizziness. His hands are sensitive to cold. On physical examination, he has generalized lymphadenopathy and hepatosplenomegaly. Laboratory studies indicate hyperproteinemia with a serum protein level of 15.5 g/dL and albumin concentration of 3.2 g/dL. A bone marrow biopsy is performed, and microscopic examination of the specimen shows infiltration of small plasmacytoid lymphoid cells with Russell bodies in the cytoplasm. Which of the following findings is most likely to be reported for this patient?
â–¡ (A) Monoclonal IgM spike in serum
â–¡ (B) WBC count of 255,000/mm3
â–¡ (C) Hypercalcemia
â–¡ (D) Bence Jones proteinuria
â–¡ (E) Karyotype with t(14;18) translocation