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A new case of IgE myeloma
R L Alexander1, S T Roodman, P J Petruska
1Department of Pathology, St. Louis University, MO.
Insights
This study details a rare case of IgE myeloma in an elderly woman, highlighting diagnostic challenges and unique immunological findings. The research contributes to understanding this uncommon plasma cell disorder.
Area of Science:
- Hematology
- Immunology
- Oncology
Background:
- Multiple myeloma is a plasma cell malignancy typically involving IgG, IgA, or light chains.
- IgE myeloma is an extremely rare subtype, posing diagnostic and therapeutic challenges.
- Early identification and characterization are crucial for managing rare plasma cell neoplasms.
Observation:
- A 78-year-old woman presented with bone pain, weakness, and hypercalcemia.
- Serum protein electrophoresis and immunofixation revealed an IgE kappa monoclonal protein.
- Bone marrow biopsy showed significant infiltration by abnormal plasma cells (60%).
Findings:
- Radiological imaging identified osteolytic lesions and osteopenia in the spine and sacrum.
- Flow cytometry revealed IgE binding to lymphocytes, with a subset identified as natural killer cells.
- The patient's presentation and findings are compared with existing literature on IgE myeloma.
Implications:
- This case underscores the importance of considering rare myeloma subtypes in clinical practice.
- Understanding the immunological profile, including IgE-mediated cell interactions, may offer new therapeutic avenues.
- Further research into IgE myeloma is needed to improve diagnostic accuracy and treatment strategies.
Abstract:
We report a case of IgE myeloma in a 78-year-old woman who presented with bone pain in the shoulder and hip and progressive weakness. Except for hypercalcemia, routine chemistry values were within normal limits. Hemoglobin was decreased and the leukocyte count slightly increased. Plasma cells were not observed in the peripheral blood. Serum protein electrophoresis showed a monoclonal protein in the beta-globulin fraction. Immunofixation confirmed the presence of an IgE kappa monoclonal protein. A bone marrow biopsy revealed an interstitial and nodular infiltration of abnormal plasma cells comprising 60% of nucleated cells present. Skeletal roentgenograms and bone scans of this patient showed osteolytic lesions and osteopenia of the thoracic and lumbar spine and osteolytic destruction of the right half of the sacrum. Flow-cytometric analysis of mononuclear cells isolated from peripheral blood showed that 15% of the lymphocytes bound IgE. Using cell-surface markers, we identified 45% of the IgE-positive cells as natural killer cells. Similar results have been found in other diseases marked by increased IgE. The clinical, radiological, and laboratory findings for this patient are compared with previously reported cases of IgE and other types of myeloma.