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Macroglobulinemia and chronic B-cell type lymphocytic leukemia in japan--study of autopsy cases
Insights
This study examined Waldenström's macroglobulinemia (WM) and chronic lymphocytic leukemia (B-CLL) in Japan. Both diseases primarily affect males aged 50-60 and share similar bone marrow involvement patterns.
Area of Science:
- Hematology
- Oncology
- Pathology
Background:
- Waldenström's macroglobulinemia (WM) and chronic lymphocytic leukemia of B-cell type (B-CLL) are lymphoproliferative disorders.
- Understanding their geographical distribution and histological features in Japan is crucial for diagnosis and treatment.
Purpose of the Study:
- To determine the geographical distribution of WM and B-CLL in Japan.
- To analyze the histological characteristics of WM and B-CLL, including bone marrow involvement and cellular differentiation.
Main Methods:
- Autopsy cases of WM and B-CLL in Japan were reviewed.
- Histological examination and immunophenotyping were performed to classify the diseases and assess cellular characteristics.
Main Results:
- Both WM and B-CLL predominantly affected males aged 50-60 and were distributed throughout Japan.
- Histologically, both diseases showed small cell type morphology with plasmacytic differentiation and similar bone marrow involvement patterns (follicular, mixed, or diffuse).
- Monoclonal cytoplasmic immunoglobulins (IgM for WM, various types for B-CLL) were detected.
Conclusions:
- WM and B-CLL exhibit similar epidemiological and histological features in Japan.
- Both conditions can be classified as bone marrow-based lymphomas based on tumor cell growth patterns.
Abstract:
Autopsy cases of Waldenström's macroglobulinemia (WM) and chronic lymphocytic leukemia of B-cell type (B-CLL) were examined to determine the geographical distribution and histological characteristics of these diseases in Japan. Both diseases occurred primarily at 50 to 60 years of age with a predominance of males and were distributed throughout Japan with a population slightly lower than that of T-CLL in southwestern Japan. Histologically WM (31 cases) consisted mainly of small cell type malignant lymphoma with plasmacytic differentiation (27 cases) according to the Japanese Classification (LSG) and cytoplasmic immunoglobulins with a monoclonal pattern of immunoglobulin M (IgM) (lambda 12; kappa seven). The bone marrow involvement (27 cases) was follicular, mixed (follicular and diffuse) or diffuse. B-CLL (58 cases) also showed principally a small cell type histology (48 cases) and 16 of the cases showed plasmacytic differentiation as in WM. Cytoplasmic immunoglobulins with a monoclonal pattern were found in 10 (six of IgG, two of IgM, one of IgG and M, and one of IgA). Bone marrow involvement (56 cases) revealed the same histological pattern as WM. According to the growth pattern of the tumor cells in the bone marrow and lymph nodes, both diseases may be categorized as bone marrow-based lymphoma.