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Related Experiment Videos

Oestrogen receptor expression in normal breast epithelium.

S A Khan1, M A Rogers, K K Khurana

  • 1Northwestern Memorial Hospital, 303 E. Chicago Ave, Tarry 11-703, Chicago, IL 60611, USA. skhan@nmff.org

European Journal of Cancer (Oxford, England : 1990)
|November 1, 2000
PubMed
Summary

Newer antibodies reveal higher oestrogen receptor (ER) levels in breast tissue, potentially impacting breast cancer risk assessment. Further research is needed to establish new thresholds for ER positivity in paraffin-embedded samples.

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Area of Science:

  • Oncology
  • Pathology
  • Endocrinology

Background:

  • Elevated oestrogen receptor (ER) expression in breast epithelium is linked to increased breast cancer risk, particularly with prolonged estrogen exposure.
  • Previous research utilized immunohistochemical ER assays on fresh-frozen benign breast tissue.
  • Paraffin-embedded tissue and advanced antibodies offer greater feasibility and sensitivity for future studies.

Purpose of the Study:

  • To evaluate the performance of newer, more sensitive antibodies (6F11 and TE111) for ER detection in paraffin-embedded breast epithelium.
  • To compare ER expression levels using these new antibodies with previous findings from fresh-frozen samples.
  • To determine if current thresholds for ER positivity need re-evaluation.

Main Methods:

  • Analysis of 30 paraffin-embedded breast epithelium samples from postmenopausal women.

Related Experiment Videos

  • Immunohistochemical staining using two specific antibodies: 6F11 and TE111.
  • Quantification of median labelling indices for ER expression.

    • Main Results:

    • Significantly higher median labelling indices for ER were observed using the 6F11 and TE111 antibodies compared to previous studies.
    • The increased sensitivity of the new antibodies suggests a potential underestimation of ER levels in earlier assessments.
    • These findings indicate a need to adjust the established thresholds for ER positivity.

    Conclusions:

    • Newer antibodies and paraffin-embedded tissues provide more sensitive detection of ER in breast epithelium.
    • Current thresholds for ER positivity require re-evaluation due to higher observed median labelling indices.
    • Further research is essential to resolve remaining issues and establish reliable ER assessment protocols for breast cancer risk prediction.