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Related Concept Videos

The Availability Heuristic01:08

The Availability Heuristic

A heuristic is a general problem-solving framework (Tversky & Kahneman, 1974). You can think of these as mental shortcuts that are used to solve problems. Different types of heuristics are used in different types of situations, and the impulse to use a heuristic occurs when one of five conditions is met (Pratkanis, 1989):

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Related Experiment Video

Updated: May 20, 2026

High-throughput Fluorometric Measurement of Potential Soil Extracellular Enzyme Activities
12:33

High-throughput Fluorometric Measurement of Potential Soil Extracellular Enzyme Activities

Published on: November 15, 2013

[Not Available].

J-F Emile

    Journal De Chirurgie
    |July 17, 2012
    PubMed
    Summary
    This summary is machine-generated.

    Gastrointestinal stromal tumors (GIST) are common digestive tract cancers often found incidentally. Targeted therapies like Imatinib show significant progress against these tumors, which resist conventional chemotherapy.

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    Area of Science:

    • Gastrointestinal Oncology
    • Surgical Pathology
    • Molecular Diagnostics

    Context:

    • Gastrointestinal stromal tumors (GIST) are the most common mesenchymal neoplasms of the digestive tract.
    • They can occur anywhere from the esophagus to the anus, and rarely in the peritoneal cavity or mesentery.
    • GIST often remain asymptomatic, leading to incidental discovery during endoscopy or surgery, with metastases detected in 15-50% of cases at diagnosis.

    Purpose:

    • To characterize the epidemiology, histology, diagnosis, prognosis, and treatment of GIST.
    • To highlight the diagnostic confirmation methods including immunohistochemistry and molecular biology.
    • To discuss the prognostic factors and the efficacy of targeted therapies.

    Summary:

    • Histologically, GIST are characterized by spindle or epithelioid cell proliferation.
    • Diagnosis is confirmed by KIT positivity (95%) via immunohistochemistry or KIT/PDGFRA mutations (85%) via molecular biology.
    • Primary site, mitotic rate, and tumor size are key prognostic indicators, with 30-50% of patients developing metastases.

    Impact:

    • GIST demonstrate high resistance to conventional chemotherapy.
    • Targeted therapies, such as Imatinib, represent a major advancement in GIST treatment and oncology.
    • Understanding GIST biology and treatment is crucial for improving patient outcomes in gastrointestinal cancer.