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Measurement of occupied and non-occupied epidermal growth factor receptor sites in 216 human breast cancer biopsies.

Abstract：

:The epidermal growth factor (EGF) is one of several growth factors involved in normal breast epithelial development and tumor proliferation. EGF and EGF-like peptide TGF alpha bind and activate the same membrane receptor protein. This receptor (EGF-R) has been recently studied in breast tumor biopsies and its detectability reported as a prognostic indicator. However, normal and tumor tissue themselves produce EGF and related peptides in variable amount. This suggests that the standard measurement of EGF-R by binding assay should reflect only the number of non-occupied receptor sites. Based on this observation, the presence of occupied sites (EGF-R2) has been assessed in 216 human mammary tumor biopsies simultaneously with the direct measurement of non occupied EGF receptor sites (EGF-R1) and the results compared to estrogen and progesterone receptor status (ER, PGR). EGF-R1 and EGF-R2 were evaluated by 2 separate (125I) EGF binding assays performed on 2 aliquots of tumor crude membrane fraction, the first one directly, the other after dissociation of the endogenously bound ligand. The validity of the method has been assessed on membrane fractions prepared from human placenta. It is shown that the dissociation does not modify the binding dissociation constant. ER and PGR were measured by the dextran coated charcoal method. Results greater than 10 fmol/mg of membrane or cytosol protein were considered as positive. It is found that EGF-R1 and EGF-R2 are detectable in 54 and 90% of the cases, indicating that EGF-R is masked by endogenous ligand in 36% of the tumors.(ABSTRACT TRUNCATED AT 250 WORDS)

journal_name

Breast Cancer Res Treat

journal_title

Breast cancer research and treatment

authors

Falette N,Lefebvre MF,Meggouh F,Eynard M,Garin E,Saez S

doi

10.1007/BF01834623

subject

Has Abstract

pub_date

1992-03-01 00:00:00

pages

177-83

issue

3

eissn

0167-6806

issn

1573-7217

journal_volume

20

pub_type

杂志文章

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