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[Clinical epidemiology]
1First Department of Internal Medicine, Tokyo Medical University.
Abstract:
Although the exact incidence of chronic myeloid leukemia(CML) in Japan is obscure, the occurrence rate of CML is approximately 15% of all leukemia patients in Japan, and thus about 5/100,000 cases appeared per year. This incidence of CML seems to be lower that that of Caucasian, but the incidence of CML patients in Japan may increase gradually. Molecular investigation in CML disclosed the exact mechanism of t(9; 22) anomaly, thus providing appropriate classification for chronic myeloid leukemia. From the etiological aspect, it is well documented that exposure to atomic bomb at Nagasaki and Hiroshima actually induced CML, however, factors other than irradiation are still obscure. Recent spread of annual examination pick up some CML patients at the early phase and the disease severity might be thus different from those of previous CML patients. For example, currently diagnosed CML patients usually lack palpable splenomegaly and some of them had normal karyotypes in addition to Ph-cells in the bone marrow at the time of CML diagnosis. These findings indicate that epidemiological aspect in CML patients might be changing.
Insights
The incidence of chronic myeloid leukemia (CML) in Japan is approximately 5/100,000 annually, potentially increasing. Early detection through annual exams reveals changing CML patient demographics and disease characteristics.
Area of Science:
- Hematology
- Oncology
- Epidemiology
Context:
- Chronic myeloid leukemia (CML) incidence in Japan is estimated at 5/100,000 per year, representing about 15% of all leukemia cases.
- While CML rates in Japan appear lower than in Caucasian populations, a gradual increase may occur.
- Historical etiological factors include atomic bomb radiation exposure, but other causes remain unclear.
Purpose:
- To investigate the epidemiological trends and changing characteristics of chronic myeloid leukemia (CML) in Japan.
- To understand the molecular basis of CML, specifically the t(9;22) translocation.
- To analyze how increased early detection through annual examinations impacts CML patient profiles.
Summary:
- CML occurs at an estimated rate of 5/100,000 annually in Japan, with potential for increase.
- Molecular studies have elucidated the t(9;22) anomaly as central to CML pathogenesis and classification.
- Modern diagnostic practices identify CML earlier, often presenting with less severe symptoms like absent splenomegaly and varied karyotypes alongside Philadelphia chromosome presence.
Impact:
- Findings suggest evolving epidemiological patterns in CML within the Japanese population.
- Early diagnosis may lead to altered disease presentation and severity compared to historical cohorts.
- This research highlights the need for ongoing surveillance and updated understanding of CML in Japan.