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Updated: Jun 22, 2026

Generation and Expansion of Primary, Malignant Pleural Mesothelioma Tumor Lines
Published on: April 21, 2022
Pathology of mesothelioma
1Department of Pathology, Graduate School of Biomedical Sciences, Hiroshima University, 1-2-3 Kasumi, Minami-ku, Hiroshima, Japan. koinai@hiroshima-u.ac.jp
Abstract:
The incidence of mesothelioma has been gradually increasing in Japan, and the underlying factor for this is considered to be the increase in the amount of asbestos imported into Japan between 1960 and 1975. Mesothelioma can be roughly divided into localized and diffuse types, but the former is extremely rare. In making a diagnosis of mesothelioma, it is important to confirm the location of tumor and the specific gross findings before histological examination. Mesothelioma can be categorized histologically as epithelioid type, sarcomatoid type, biphasic type, desmoplastic type, among others. It can take many forms; consequently, there are many diseases to be differentiated when the diagnosis of mesothelioma is based on histological analyses. Immunohistochemical stains are useful for making a diagnosis, but the correct combination of antibodies as positive or negative markers should be selected and a comprehensive assessment of the staining results is necessary. The accuracy of the pathological diagnosis is very important to the patients because they can be receive official compensation or relief when the diagnosis of mesothelioma is confirmed. Under present conditions, both clinicians and pathologists must make a concerted effort to improve the accuracy of the diagnosis of mesothelioma.
Insights
Mesothelioma incidence is rising in Japan due to past asbestos exposure. Accurate diagnosis requires careful gross examination and immunohistochemistry to ensure patient compensation and relief.
Area of Science:
- Oncology
- Pathology
- Environmental Health
Background:
- The incidence of mesothelioma, a rare cancer, is increasing in Japan.
- This rise is linked to significant asbestos importation between 1960 and 1975.
- Accurate diagnosis is crucial for patient compensation and relief.
Purpose of the Study:
- To highlight the diagnostic challenges of mesothelioma.
- To emphasize the importance of gross findings and histological examination.
- To underscore the role of immunohistochemistry in accurate mesothelioma diagnosis.
Main Methods:
- Review of mesothelioma classification and diagnostic criteria.
- Discussion of histological subtypes including epithelioid, sarcomatoid, biphasic, and desmoplastic types.
- Emphasis on the utility and selection of immunohistochemical markers.
Main Results:
- Mesothelioma diagnosis is complex due to diverse presentations and differential diagnoses.
- Histological examination must be preceded by confirmation of tumor location and gross findings.
- Careful selection and comprehensive assessment of immunohistochemical stains are vital.
Conclusions:
- Accurate pathological diagnosis of mesothelioma is critical for patient welfare and access to benefits.
- Clinicians and pathologists must collaborate to enhance diagnostic accuracy.
- Improved diagnostic strategies are needed to address the increasing mesothelioma burden.
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