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Correlation between apparent diffusion coefficients and HER2 status in gastric cancers: pilot study.

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Apparent diffusion coefficient (ADC) values from diffusion-weighted imaging (DWI) show a correlation with HER2 status in gastric cancer. This suggests DWI may help predict HER2 status and personalize treatment for patients.

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Area of Science:

  • Oncology
  • Radiology
  • Molecular Diagnostics

Background:

  • Gastric cancer diagnosis and treatment rely on accurate staging and molecular profiling.
  • HER2 (Human Epidermal growth factor Receptor 2) status is a critical biomarker for guiding targeted therapy in gastric cancer.
  • Diffusion-weighted imaging (DWI) offers a non-invasive method to assess tissue microstructural properties.

Purpose of the Study:

  • To investigate the correlation between apparent diffusion coefficient (ADC) values derived from DWI and HER2 protein expression and gene amplification in gastric cancer.
  • To determine if ADC values can serve as a predictive biomarker for HER2 status in gastric cancer patients.

Main Methods:

  • Forty-five patients with biopsy-confirmed gastric cancer underwent DWI prior to surgical resection.
  • ADC values were calculated from DWI scans (b values: 0 and 1,000 s/mm²).
  • HER2 status was assessed postoperatively using immunohistochemistry and fluorescence in situ hybridization (FISH); ADC values were compared between HER2-positive and HER2-negative tumors using statistical tests.

Main Results:

  • A significant correlation was found between mean ADC values and HER2 status (r=0.312, P=0.037) and scores (r=0.419, P=0.004).
  • HER2-positive gastric cancers exhibited significantly higher mean ADC values (1.211 mm²/s) compared to HER2-negative tumors (0.984 mm²/s, P=0.020).
  • Minimal ADC values were also significantly higher in HER2-positive tumors (1.105 × 10⁻³ mm²/s) versus HER2-negative tumors (0.905 × 10⁻³ mm²/s, P=0.036).

Conclusions:

  • ADC values derived from DWI show a significant correlation with HER2 status in gastric cancer.
  • This pilot study suggests that DWI may have the potential to non-invasively predict HER2 status.
  • Further research is warranted to validate DWI's role in predicting HER2 status and guiding personalized gastric cancer therapy.