A case of leukemic B cell lymphoma with marked polyclonal hyperimmunoglobulinemia is reported.
A 80-year-old man was admitted to our hospital with complaints of fever and increased bowel movements. Physical examination showed generalized lymphadenopathy. Barium enema and endoscopic biopsy revealed multiple nodular lymphoid hyperplasia of the colon. Laboratory findings were as follows: total serum protein 9.35 g/d
l (γ-globulin 52.7%; IgG 3,700mg/d
l, IgA 1,100mg/d
l, IgM 201mg/d
l, IgD<2mg/d
l, IgE 1,140 IU/m
l, κ/λ ratio 1.64), GOT 59.1 U, GPT 33.2 U, Ch-E 0.2 ΔPH, RBC 268×10
4/mm
3, Hb 8.8g/d
l, Th 12.8×10
4/mm
3, WBC 9,200/mm
3 with 67% lymphocyte (small 7%, cleaved 10%, non-cleaved 42%, plasmacytoid 8%), Coombs' test and ANF positive, ASLO×640, anti-EBV-VCA-IgG×2,560, VCA-IgM×40. Bone marrow aspiration showed NCC 18.8×10
4/mm
3 with 41.2% lymphocytes (cleaved 19.4%) and 6.8% plasma cells.
Pathological diagnosis of a resected cervical lymph node was non-Hodgkin's lymphoma of diffuse and medium-sized cell type based on L.S.G classification.
Malignant cells in both peripheral blood and lymph node possessed surface and cytoplasmic immunoglobulins of each class (IgM, G, A) keeping monoclonality (kappa chain type). Analysis of T cell subsets by OKT series and OKIa
1 revealed an increase of activated helper T cells and decrease of suppressor T cells.
Laparoscopy disclosed early liver cirrhosis.
Therefore, it seems that polyclonal hyperimmunoglobulinemia in this case was induced not only by polyclonal normal B cell activation due to liver cirrhosis, EB virus reactivation and aging, but was also a result of secretion from malignant cells with intraclonal class switch and plasmacytoid differentiation.
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