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Cancer-associated proteins in effusion fluids

S N Booth, G Lakin, P W Dykes

    Journal of Clinical Pathology
    |June 1, 1977
    PubMed
    Summary

    Measuring carcinoembryonic antigen (CEA) in effusion fluid is more effective than serum tests for distinguishing cancerous effusions. Fluid CEA estimation shows promise as a clinical tool for cancer diagnosis.

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    Area of Science:

    • Oncology
    • Biochemistry
    • Clinical Diagnostics

    Background:

    • Ascites and pleural effusions are complex fluid accumulations often associated with various medical conditions, including cancer.
    • Accurate differentiation between malignant, congestive, and inflammatory effusions is crucial for effective patient management.
    • Biomarkers in bodily fluids are continuously explored for improved diagnostic accuracy.

    Purpose of the Study:

    • To evaluate the diagnostic utility of two cancer-associated proteins, carcinoembryonic antigen (CEA) and pregnancy-associated alpha2 glycoprotein (PAG), in serum and effusion fluids.
    • To compare the effectiveness of these protein measurements against traditional cytological examination.
    • To assess the value of normal serum proteins in effusion fluids for diagnostic purposes.

    Main Methods:

    • Serum and effusion fluid samples were collected from patients with ascites and pleural effusions.
    • Levels of carcinoembryonic antigen (CEA) and pregnancy-associated alpha2 glycoprotein (PAG) were measured.
    • Thirteen normal serum proteins were also quantified in the samples.
    • Results were compared between cancerous and non-cancerous (congestive, inflammatory) effusions and with cytological findings.

    Main Results:

    • CEA measurement in effusion fluid demonstrated higher efficacy than serum CEA in differentiating cancerous effusions from congestive or inflammatory ones.
    • Fluid CEA estimation showed potential as a valuable clinical tool when compared to cytological examination.
    • Serum PAG levels were elevated in cancer patients, but PAG measurement in effusion fluid did not aid in disease group separation.
    • Quantification of individual normal serum proteins in effusion fluids provided no significant diagnostic advantage.

    Conclusions:

    • Effusion fluid carcinoembryonic antigen (CEA) is a more effective biomarker than serum CEA for distinguishing malignant effusions.
    • CEA measurement in effusion fluid represents a potentially valuable adjunct to current diagnostic methods like cytology.
    • Pregnancy-associated alpha2 glycoprotein (PAG) and normal serum proteins in effusion fluid have limited diagnostic utility for differentiating effusion types.

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