Quantitation of estrogen receptor in seventy-five specimens of breast cancer: comparison between an immunoassay (Abbott ER-EIA monoclonal) and a (3H)estradiol binding assay based on isoelectric focusing in polyacrylamide gel

Journal Article · Fri Aug 01 00:00:00 EDT 1986 · Cancer Res.; (United States)

OSTI ID:5023304

Pousette, A; Gustafsson, S A; Thoernblad, A M.N.; Nordgren, A; Saellstroem, J Li; Lindgren, A; Sundelin, P; Gustafsson, J A

Quantitation of estrogen receptor has been performed in cytosol prepared from 75 specimens of breast cancer tissue from patients who had not received hormonal therapy. The study was performed in order to compare an immunoassay (Abbott Laboratories, North Chicago, IL) with our currently used method for estrogen receptor analysis based on isoelectric focusing of (/sup 3/H)estradiol-receptor complex in polyacrylamide gels. Using linear regression analysis, a regression coefficient (slope) of 1.30 and a correlation coefficient of 0.75 were calculated. The differences in results between the two methods are probably partly explained by the fact that the ligand-based method only measures unoccupied receptor, whereas the immunoassay detects the total amount of receptor, resulting in generally slightly higher concentrations with the latter method. However, in five of 75 specimens the ligand-based method gave a considerably higher concentration of estrogen receptor. This was most probably explained by partial proteolysis resulting in the formation of receptor fragment(s), which was undetectable with the immunoassay but detectable with the ligand-based method. These observations underline the importance of careful handling of specimens during the whole immunoassay procedure.

• Research Organization: Huddinge Univ. Hospital, Sweden
• OSTI ID: 5023304
• Journal Information: Cancer Res.; (United States), Journal Name: Cancer Res.; (United States)
• Country of Publication: United States
• Language: English

Related Subjects

59 BASIC BIOLOGICAL SCIENCES
ESTROGENS
RECEPTORS
QUANTITATIVE CHEMICAL ANALYSIS
CARCINOMAS
COMPARATIVE EVALUATIONS
ENZYME IMMUNOASSAY
ESTRADIOL
MAMMARY GLANDS
MEASURING METHODS
PATIENTS
TRITIUM COMPOUNDS
TUMOR CELLS
ANIMAL CELLS
BODY
CHEMICAL ANALYSIS
DISEASES
ESTRANES
GLANDS
HORMONES
HYDROXY COMPOUNDS
IMMUNOASSAY
LABELLED COMPOUNDS
MEMBRANE PROTEINS
NEOPLASMS
ORGANIC COMPOUNDS
ORGANS
PROTEINS
STEROID HORMONES
STEROIDS
550201* - Biochemistry- Tracer Techniques