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Update on the Treatment of Multiple Myeloma

Division of Hematology and Internal Medicine, Mayo Clinic and Mayo Foundation, Rochester, Minnesota, USA

Correspondence: Robert A. Kyle, M.D., Mayo Clinic, 200 First Street SW, Rochester, Minnesota 55905, USA. e-mail: kyle.robert{at}mayo.edu

The patient with multiple myeloma should be carefully evaluated from the standpoint of symptoms, physical findings, and laboratory data. If there are no symptoms or evidence of early or impending complications, the patient should not be treated. He or she should be followed and treatment delayed until progression of the disease occurs. If the patient is younger than 70 years, autologous peripheral blood stem cell transplantation should be considered. Hematopoietic stem cells should be collected before the patient is exposed to alkylating agents. If the patient is older than 70 years, chemotherapy is indicated. The two major shortcomings of autologous stem cell transplantation are: A) failure to eradicate myeloma, and B) contamination of autologous peripheral blood stem cells. Most physicians initially treat the patient with vincristine, doxorubicin (Adriamycin), and dexamethasone (VAD) for three to four months and then collect the peripheral blood stem cells. One can then proceed with transplant or treat the patient with alkylating agents and delay the transplant until the patient progresses. In a prospective trial comparing autologous bone marrow transplantation with conventional chemotherapy, five-year overall survival favored the transplant group (52% versus 12%). In a randomized trial of 400 patients from France, there was no difference in event-free or overall survival between double and single autologous stem cell transplant when evaluated at two years. In a subsequent evaluation, patients with a low ß₂-microglobulin value at diagnosis appeared to have better results with a double transplant. There is no evidence that combinations of chemotherapeutic agents are more effective than melphalan and prednisone. Allogeneic transplantation is associated with a high mortality. Depletion of T-cells or a mini-allogeneic transplant may be beneficial in an effort to reduce mortality. Thalidomide produces objective response in approximately 30% of refractory patients. The use of intravenous bisphosphonates is recommended for patients with skeletal lesions. Hypercalcemia and renal failure must be treated promptly.

Key Words. Multiple myeloma • Refractory • Treatment • VAD

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