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Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence in situ hybridization

  • Authors:
    • Ayana Sato
    • Yuka Maeda
    • Akiko Matsumoto
    • Tatsuhiko Ikeda
    • Hiromitsu Jinno
  • View Affiliations / Copyright

    Affiliations: Department of Surgery, Teikyo University School of Medicine, Tokyo 173‑8606, Japan
    Copyright: © Sato et al. This is an open access article distributed under the terms of Creative Commons Attribution License.
  • Article Number: 92
    |
    Published online on: December 6, 2024
       https://doi.org/10.3892/ol.2024.14838
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Abstract

Although trastuzumab deruxtecan improves the prognosis of patients with HER2‑low breast cancer, the characteristics and prognostic value of low HER2 status remains to be elucidated. A prospective database of patients with clinical stage I to III breast cancer who underwent surgery between September 2012 and October 2022 at Teikyo University Hospital (Tokyo, Japan) were analyzed. HER2 was evaluated using fluorescence in situ hybridization assay, and HER2‑low and HER2‑negative was defined as HER2/CEP17 ratio ≥1.0, and <1.0, respectively. The median age and Ki67 score of the 1,024 patients were 56.0 years (range, 23.0‑93.0 years) and 15.0% (range, 0.5‑99.0%), respectively. Overall, 908 (88.7%) patients were hormone receptor positive. Among all patients, 902 (88.1%) had HER2‑low tumors and 122 (11.9%) had HER2‑negative tumors. Positive rates for estrogen receptor (ER) and progesterone receptor (PgR) were significantly higher in HER2‑low compared with HER2‑negative patients [ER: 804 (89.1%) patients vs. 99 (81.1%) patients, P=0.021; PgR: 723 (80.1%) patients vs. 86 (70.5%) patients, P=0.023]. The median Ki67 score was significantly lower in HER2‑low compared with HER2‑negative patients (14.5 vs. 18.5%; P=0.013). With a median follow‑up time of 46.2 months, the overall survival (OS) was significantly improved in HER2‑low compared with HER2‑negative patients (97.4 vs. 96.7%; P=0.029). Multivariate logistic regression analyses revealed that HER2‑low status was not an independent factor for OS. The findings of the present study suggest that HER2‑low status may not have a significant association with prognosis, despite a significant association between Ki67 and hormone receptor expression.
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Copy and paste a formatted citation
Spandidos Publications style
Sato A, Maeda Y, Matsumoto A, Ikeda T and Jinno H: Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization. Oncol Lett 29: 92, 2025.
APA
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., & Jinno, H. (2025). Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization. Oncology Letters, 29, 92. https://doi.org/10.3892/ol.2024.14838
MLA
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., Jinno, H."Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization". Oncology Letters 29.2 (2025): 92.
Chicago
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., Jinno, H."Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization". Oncology Letters 29, no. 2 (2025): 92. https://doi.org/10.3892/ol.2024.14838
Copy and paste a formatted citation
x
Spandidos Publications style
Sato A, Maeda Y, Matsumoto A, Ikeda T and Jinno H: Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization. Oncol Lett 29: 92, 2025.
APA
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., & Jinno, H. (2025). Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization. Oncology Letters, 29, 92. https://doi.org/10.3892/ol.2024.14838
MLA
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., Jinno, H."Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization". Oncology Letters 29.2 (2025): 92.
Chicago
Sato, A., Maeda, Y., Matsumoto, A., Ikeda, T., Jinno, H."Clinicopathological features and prognosis of breast cancer with low HER2 status evaluated by fluorescence <em>in situ</em> hybridization". Oncology Letters 29, no. 2 (2025): 92. https://doi.org/10.3892/ol.2024.14838
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