Reagent-saving immunohistochemistry for HER2 using non-contact alternating current electric field mixing
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Updated: Feb 5, 2026
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Published on: October 10, 2025
Iku Hoshino1, Kazuhiro Imai2, Hiroshi Nanjo3
1Department of Thoracic Surgery, Akita University Graduate School of Medicine, Akita, Japan.
Aims:
Human epidermal growth factor receptor 2 (HER2)-targeted agents are an effective approach to treating patients with HER2-positive breast cancer. However, the lack of survival benefit in HER2-negative patients, as well as the toxic effects and high cost of the drugs, highlight the need for accurate and prompt assessment of HER2 status. Our aim was to evaluate the clinical utility of a novel reagent-saving immunohistochemistry method (AC-IHC) that saves HER2 antibody by taking advantage of the non-contact mixing effect in microdroplets subjected to an alternating current electric field.
Methods:
Ninety-five specimens were used from patients diagnosed with primary breast cancers identified immunohistochemically as HER2 0/1+, 2+ or 3+ using ASCO/CAP guideline-certified standard IHC. The specimens were all tested using the conventional IHC method (1:50 antibody dilution) as well as AC-IHC (1:50 dilution) and reagent-saving AC-IHC (1:100 dilution).
Results:
The reagent-saving AC-IHC produced stable results with less non-specific staining using smaller amounts of labelled antibody. Moreover, the staining and accuracy of HER2 status evaluated with the reagent-saving AC-IHC method was equal to that achieved with standard IHC.
Conclusions:
These results suggest reagent-saving AC-IHC could be used as a clinical tool for accurate and stable HER2 IHC, even when reagent concentrations vary.
Insights
A new reagent-saving immunohistochemistry (AC-IHC) method accurately assesses Human Epidermal growth factor Receptor 2 (HER2) status in breast cancer. This technique uses less antibody while maintaining diagnostic accuracy, offering a cost-effective solution.
Area of Science:
- Oncology
- Biotechnology
- Immunohistochemistry
Background:
- Human Epidermal growth factor Receptor 2 (HER2)-targeted therapies are crucial for HER2-positive breast cancer.
- Accurate HER2 status assessment is vital for effective treatment selection and avoiding unnecessary toxicity in HER2-negative cases.
- Current methods face challenges with toxic effects, high costs, and the need for precise HER2 evaluation.
Purpose of the Study:
- To evaluate the clinical utility of a novel reagent-saving immunohistochemistry (AC-IHC) method for HER2 status assessment.
- To leverage the non-contact mixing effect in microdroplets using alternating current electric fields for antibody-based assays.
- To determine if AC-IHC can reduce reagent consumption while maintaining diagnostic accuracy.
Main Methods:
- Ninety-five primary breast cancer specimens were analyzed.
- HER2 status was initially classified using standard immunohistochemistry (IHC) based on ASCO/CAP guidelines.
- Specimens were tested with conventional IHC (1:50 dilution), AC-IHC (1:50 dilution), and reagent-saving AC-IHC (1:100 dilution).
Main Results:
- The reagent-saving AC-IHC method demonstrated stable results with reduced non-specific staining.
- This method effectively utilized smaller quantities of labelled antibody.
- HER2 status evaluation using reagent-saving AC-IHC showed staining and accuracy comparable to standard IHC.
Conclusions:
- Reagent-saving AC-IHC is a viable clinical tool for precise and stable HER2 IHC.
- The method ensures accurate HER2 assessment even with variations in reagent concentrations.
- This approach offers potential for cost savings and improved efficiency in HER2 testing.
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