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[Chronic lymphocytic leukemia in Japan]
1Second Department of Internal Medicine, Faculty of Medicine, Mie University.
Summary
Japanese B-cell chronic lymphocytic leukemia (CLL) patients exhibit distinct phenotypic characteristics, including high expression of activated antigens. The incidence of CLL and its subtypes is significantly lower in Japan compared to Western countries.
Area of Science:
- Hematology
- Oncology
- Immunology
Context:
- Evaluation of 41 patients diagnosed with B-cell chronic lymphocytic leukemia (CLL) in Japan.
- Classification into five groups (CLL, CLL-L, CLL/PL, PLL, LSCL) based on morphological criteria.
- Comparison of CLL characteristics between Japanese and Western populations.
Purpose:
- To classify Japanese CLL patients based on morphological criteria.
- To investigate the phenotypic characteristics of CLL in Japan.
- To compare the incidence and characteristics of CLL in Japan with Western countries.
Summary:
- Seven out of 41 patients (17%) had typical CLL (>90% small lymphocytes).
- Japanese CLL cases showed high expression of activated antigens (CD22, PCA1, CD25), suggesting a higher proportion of atypical CLL.
- Molecular analysis revealed C mu gene deletion in three sIg-negative cases. The incidence of CLL subtypes in Japan is approximately 1/10 of that in Western countries.
Impact:
- Highlights unique phenotypic features of CLL in the Japanese population.
- Suggests potential differences in CLL pathogenesis or presentation between ethnic groups.
- Provides crucial epidemiological data on CLL incidence in Japan.