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Published on: September 19, 2014
Evaluation of EphB4 as Target for Image-Guided Surgery of Breast Cancer
Cansu de Muijnck1, Yoren van Gorkom1, Maurice van Duijvenvoorde1
1Department of Surgery, Leiden University Medical Center, 2300 RC Leiden, The Netherlands.
Background:
Targeted image-guided surgery is based on the detection of tumor cells after administration of a radio-active or fluorescent tracer. Hence, enhanced binding of a tracer to tumor tissue compared to healthy tissue is crucial. Various tumor antigens have been evaluated as possible targets for image-guided surgery of breast cancer, with mixed results.
Methods:
In this study we have evaluated tyrosine kinase receptor EphB4, a member from the Eph tyrosine kinase receptor family, as a possible target for image-guided surgery of breast cancers. Two independent tissue micro arrays, consisting of matched sets of tumor and normal breast tissue, were stained for EphB4 by immunohistochemistry. The intensity of staining and the percentage of stained cells were scored by two independent investigators.
Results:
Immunohistochemical staining for EphB4 shows that breast cancer cells display enhanced membranous expression compared to adjacent normal breast tissue. The enhanced tumor staining is not associated with clinical variables like age of the patient or stage or subtype of the tumor, including Her2-status.
Conclusion:
These data suggest that EphB4 is a promising candidate for targeted image-guided surgery of breast cancer, especially for Her2 negative cases.
Insights
Tyrosine kinase receptor EphB4 shows enhanced expression in breast cancer cells, making it a promising target for image-guided surgery. This finding is particularly relevant for Her2-negative breast cancer cases.
Area of Science:
- Oncology
- Surgical Oncology
- Molecular Biology
Background:
- Targeted image-guided surgery relies on tracers that bind preferentially to tumor cells.
- Identifying specific tumor antigens is crucial for effective tracer localization in breast cancer.
- Previous antigen targets for breast cancer image-guided surgery have yielded variable outcomes.
Purpose of the Study:
- To evaluate tyrosine kinase receptor EphB4 as a potential target for image-guided surgery in breast cancer.
- To determine if EphB4 expression is enhanced in breast cancer tissue compared to normal breast tissue.
Main Methods:
- Immunohistochemistry was used to stain two independent tissue microarrays of matched tumor and normal breast tissue for EphB4.
- Staining intensity and the percentage of stained cells were scored by two independent investigators.
Main Results:
- Breast cancer cells demonstrated significantly enhanced membranous expression of EphB4 compared to adjacent normal breast tissue.
- The elevated EphB4 expression in tumors was independent of patient age, tumor stage, or subtype, including Her2-status.
Conclusions:
- EphB4 represents a promising molecular target for image-guided surgery in breast cancer.
- The enhanced expression suggests potential utility, particularly in Her2-negative breast cancer patients.
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