Changes in Oestrogen Receptor Concentration During Breast Cancer Therapy
Author Information
Author(s): R.A. Hawkins, A.L. Tesdale, E.D.C. Anderson, P.A. Levack, U. Chetty, A.P.M. Forrest
Primary Institution: University Department of Surgery, Royal Infirmary of Edinburgh
Hypothesis
Does the oestrogen receptor concentration of a breast cancer change during systemic therapy?
Conclusion
The study concluded that changes in oestrogen receptor concentration are unlikely to play a major role in the early response of breast tumours to systemic therapy.
Supporting Evidence
- ER concentration fell significantly in patients treated with tamoxifen.
- No significant change in ER concentration was observed in most treatment groups.
- Patients with low ER concentrations were treated directly with chemotherapy.
Takeaway
This study looked at how treatment affects a specific protein in breast cancer. It found that most treatments don't change the protein levels much.
Methodology
Patients underwent incisional biopsy for ER determination, followed by systemic therapy for 3 to 6 months, with response assessed clinically and mammographically.
Potential Biases
Potential bias due to the exclusion of patients who achieved complete clinical response to chemotherapy.
Limitations
Some patients had inadequate tumour specimens for analysis, and the study only included patients with operable breast cancer.
Participant Demographics
The mean age of participants was 53 years, with 26 premenopausal and 36 postmenopausal patients.
Statistical Information
P-Value
p<0.05
Statistical Significance
p<0.05
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