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Desmoplastic diffuse mesothelioma

R Cantin, M Al-Jabi, W T McCaughey

    The American Journal of Surgical Pathology
    |April 1, 1982
    PubMed
    Summary

    Desmoplastic malignant mesothelioma, often sarcomatous, presents aggressively with rapid progression and frequent metastases. Tumor cell type, not desmoplasia extent, dictates prognosis in these challenging pleural and peritoneal cancers.

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    Area of Science:

    • Oncology
    • Pathology

    Background:

    • Malignant mesothelioma is a rare but aggressive cancer.
    • Desmoplastic mesothelioma, characterized by dense fibrous stroma, presents diagnostic challenges.
    • Distinguishing neoplastic desmoplasia from reactive fibrosis is crucial for accurate diagnosis and prognosis.

    Purpose of the Study:

    • To analyze the clinicopathological features of desmoplastic diffuse malignant mesothelioma.
    • To investigate the relationship between tumor cell type, desmoplasia, and clinical behavior.
    • To clarify the nature of desmoplasia in malignant mesothelioma.

    Main Methods:

    • Retrospective analysis of 27 cases of desmoplastic diffuse malignant mesothelioma (26 pleural, 1 peritoneal).
    • Histopathological review to determine tumor cell type (sarcomatous, biphasic, epithelial) and assess desmoplasia.
    • Correlation of clinico-pathological findings with survival and metastasis patterns.

    Main Results:

    • The majority of cases were sarcomatous (19/27) or biphasic (6/27), with only two purely epithelial cases.
    • Purely sarcomatous mesotheliomas showed a rapid clinical course, with a mean survival of 6.18 months.
    • Metastases were more frequent in desmoplastic (60.1%) compared to non-desmoplastic mesothelioma (42.5%).
    • Tumor cell type, rather than the extent of desmoplasia, was the determinant of behavior.
    • Desmoplasia was often a manifestation of tumor cells with fibroblast-like function, mimicking reactive fibrosis.

    Conclusions:

    • Desmoplastic diffuse malignant mesothelioma, particularly the sarcomatous subtype, exhibits aggressive behavior and poor prognosis.
    • The presence of epithelial or mesenchymal elements significantly influences the clinical course.
    • Accurate differentiation of neoplastic desmoplasia from reactive fibrosis is essential for appropriate patient management.

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