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Related Experiment Videos

Extrahepatic biliary carcinomas in Asiatic bears

R J Montali, P J Hoopes, M Bush

    Journal of the National Cancer Institute
    |March 1, 1981
    PubMed
    Summary

    Extrahepatic biliary carcinomas were diagnosed in two Asiatic bears. These aggressive tumors, linked to ascites and metastasis, suggest potential genetic and dietary factors in bear cancer development.

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    Area of Science:

    • Veterinary Pathology
    • Comparative Oncology
    • Zoological Medicine

    Background:

    • Extrahepatic biliary carcinomas are rare neoplasms affecting the bile ducts outside the liver.
    • Neoplasms in zoological park animals can offer insights into disease processes and environmental influences.

    Purpose of the Study:

    • To report and characterize extrahepatic biliary carcinomas in two Asiatic bears.
    • To explore potential contributing factors for neoplasm development in these animals.

    Main Methods:

    • Necropsy and histopathological examination of affected bears.
    • Gross and microscopic evaluation of tumor tissues, including assessment for mucin production.
    • Clinical data review, including presence of ascites and jaundice.

    Main Results:

    • Two Asiatic bears presented with infiltrative, scirrhous adenocarcinomas of the extrahepatic bile ducts.
    • Tumors were associated with ascites and widespread metastasis; jaundice was noted in one case.
    • No gallstones were identified in either bear. Tumors produced variable amounts of mucin.

    Conclusions:

    • Extrahepatic biliary carcinomas in Asiatic bears are aggressive, infiltrative neoplasms.
    • Potential contributing factors may include genetic predisposition and dietary changes from natural diets.
    • Further research is warranted to understand the etiology and pathogenesis of these tumors in ursine species.

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