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Abstract #1979

The value of APT weighted imaging in differentiating breast cancer patients with HER2 zero-, low- and over-expressing

Ting Zhan1, Jian-kun Dai2, Qing-qing Wen2, and Chun-hua Lu1
1Department of Radiology, The Second Affiliated Hospital of Nanchang University, Nanchang, China, 2MR Research, GE Healthcare, Beijing, China

Synopsis

Keywords: Breast, Breast

Motivation: Breast cancer (BC) with low HER2 expression (HER2-low) may benefit from newly developed antibody-drug couplings, but identification of HER2-low by non-invasive imaging methods remains challenge.

Goal(s): To assess whether DWI and amide proton transfer weighted imaging (APTWI) can help distinguish HER2-low from HER2 zero- (HER2-zero) and over-expressions (HER2-oe) in BC.

Approach: 56 HER2-oe, 78 HER2-low, and 39 HER2-zero BC patients were enrolled. ADC and MTRasym(3.5ppm) were compared between the three groups. The identification ability was assessed by ROC analysis.

Results: MTRasym (3.5ppm) and ADC are effective predictors for diagnosing HER2 expression levels, exhibiting superior predictive performance when utilized in combination.

Impact: APTWI could be used as non-invasive biomarker for identifying HER2-zero,HER2-low, and HER2-oe. The application of APTWI would be beneficial for guiding treatment selection and dynamically monitoring HER2 expressing level throughout the course of treatment for BC patients.

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