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Malignant mastocytoma in mice.

D J Lewis, J M Offer

    Journal of Comparative Pathology
    |October 1, 1984
    PubMed
    Summary

    Spontaneous malignant mastocytoma is rare in mice, with only four cases identified. These tumors showed varied dissemination, with most cases exhibiting widespread disease and well-differentiated neoplastic cells.

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    Area of Science:

    • Veterinary Pathology
    • Oncology
    • Mouse Models

    Background:

    • Mastocytomas are neoplasms of mast cells.
    • Spontaneous tumors in research mice are important for understanding cancer biology.

    Purpose of the Study:

    • To report and characterize spontaneous malignant mastocytoma in mice.
    • To describe the incidence and pathological findings of these rare tumors.

    Main Methods:

    • Histopathological examination of affected tissues.
    • Gross necropsy findings.
    • Incidence calculation based on a large mouse cohort.

    Main Results:

    • Four cases of malignant mastocytoma were identified in approximately 20,000 mice.
    • Tumor dissemination varied, with three cases showing widespread involvement.
    • Peripheral blood involvement was rare, detected in only one case.
    • Neoplastic mast cells were well-differentiated with metachromatic granules.

    Conclusions:

    • Spontaneous malignant mastocytoma is an infrequent but significant finding in mice.
    • The varied presentation highlights the importance of thorough pathological assessment.
    • Further research may elucidate the specific mechanisms driving these spontaneous neoplasms.

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