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Related Experiment Videos

Immunomorphologic lymph node changes in rats bearing experimental breast tumors

D R Ciocca

    The American Journal of Pathology
    |April 1, 1980
    PubMed
    Summary

    In rats with long-term breast cancer, both regional and nonregional lymph nodes showed similar changes, indicating systemic lymphatic system involvement. These changes included reduced paracortical areas and altered plasma cells.

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    Area of Science:

    • Oncology
    • Immunology
    • Pathology

    Background:

    • The lymphatic system's role in cancer progression is complex.
    • Understanding lymph node morphology during tumor growth is crucial for assessing systemic effects.

    Purpose of the Study:

    • To investigate morphologic changes in regional and nonregional lymph nodes in rats with long-evolving breast cancer.
    • To compare these changes with a control group and evaluate immunologically competent cell populations.

    Main Methods:

    • Light and electron microscopy were used to examine lymph nodes from tumor-bearing rats and controls.
    • Morphometric quantitative analysis assessed immunologically competent cell populations.

    Main Results:

    • No significant differences were observed between regional and distal lymph nodes in tumor-bearing rats.
    • Compared to controls, tumor-bearing rats showed diminished paracortical areas and stimulated plasma cells in medullary cords.
    • Ultrastructural analysis revealed lymphoblasts and active lymphopoiesis in lymph nodes of tumor-bearing rats, with some plasma cells showing signs of involution.

    Conclusions:

    • Long-term tumor growth leads to similar morphologic alterations in both regional and distal lymph nodes.
    • These findings highlight the systemic implications of the lymphatic system in cancer.
    • The observed changes suggest an active but potentially altered immune response within the lymph nodes.

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