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Hereditary gastrointestinal polyposis syndromes.

R C Haggitt, B J Reid

    The American Journal of Surgical Pathology
    |December 1, 1986
    PubMed
    Summary

    Hereditary gastrointestinal polyposis syndromes are classified into adenomatous and hamartomatous types. Familial adenomatous polyposis coli (FAPC) is a key adenomatous syndrome with high colorectal cancer risk, while hamartomatous types have lower cancer risks.

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    Area of Science:

    • Gastroenterology
    • Genetics
    • Oncology

    Background:

    • Hereditary gastrointestinal polyposis syndromes are categorized into adenomatous and hamartomatous types.
    • Familial adenomatous polyposis coli (FAPC) is the primary adenomatous syndrome, characterized by numerous colorectal adenomas and a high risk of colorectal carcinoma if untreated.
    • Other adenomatous syndromes like Gardner's and Turcot's syndromes share overlapping features with FAPC, suggesting a potential single genetic basis.

    Purpose of the Study:

    • To delineate the classification and characteristics of hereditary gastrointestinal polyposis syndromes.
    • To differentiate between adenomatous and hamartomatous polyposis types and their associated cancer risks.
    • To review the extracolonic manifestations and overlapping features of various polyposis syndromes.

    Main Methods:

    • Literature review and synthesis of existing research on hereditary gastrointestinal polyposis syndromes.
    • Classification of syndromes based on pathological type (adenomatous vs. hamartomatous).
    • Analysis of clinical features, genetic transmission, and cancer risks associated with each syndrome.

    Main Results:

    • FAPC is a prototype adenomatous syndrome with high colorectal cancer risk; extracolonic manifestations include osteomas, cysts (Gardner's), and brain tumors (Turcot's).
    • Hamartomatous polyposes include Peutz-Jeghers syndrome, familial juvenile polyposis, Cowden's disease, intestinal ganglioneuromatosis, and Ruvalcaba-Myrhe-Smith syndrome.
    • Peutz-Jeghers syndrome and familial juvenile polyposis have increased gastrointestinal cancer risk, while Cowden's disease is linked to breast and thyroid cancer. Other hamartomatous syndromes show no significant cancer risk increase.

    Conclusions:

    • Hereditary gastrointestinal polyposis syndromes present diverse clinical features and cancer risks.
    • Understanding the distinction and overlap between adenomatous and hamartomatous types is crucial for accurate diagnosis and management.
    • Further research may clarify the genetic underpinnings of these overlapping syndromes.

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