Clinical Research and Prognosis of HER2-Positive Breast Cancer

A special issue of Cancers (ISSN 2072-6694). This special issue belongs to the section "Clinical Research of Cancer".

Deadline for manuscript submissions: 28 February 2026 | Viewed by 530

Special Issue Editor


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Guest Editor
Department of Surgical, Oncological and Gastroenterological Sciences, University of Padua, Via Giustiniani, 2, 35124 Padua, Italy
Interests: clinical oncology; clinical immunology; haematology; breast cancer; ovarian cancer

Special Issue Information

Dear Colleagues, 

HER2-positive breast cancer, characterized by aggressive tumor behavior, has seen transformative advances with anti-HER2 therapies, significantly improving patient outcomes. This review highlights the long-term impacts of targeted treatments, including trastuzumab, pertuzumab, and antibody–drug conjugates like T-DM1. While these therapies markedly enhance survival rates and reduce recurrence, long-term follow-up reveals challenges such as cardiotoxicity, resistance mechanisms, and late-onset side-effects. Emerging strategies, including dual HER2 blockade and novel agents like trastuzumab deruxtecan, show promise in overcoming resistance. Prognostic biomarkers and personalized approaches are critical to optimizing long-term efficacy. Overall, anti-HER2 therapies have revolutionized care, but ongoing research is essential to address persistent limitations and improve lifelong outcomes for patients. 

All submissions will undergo a rigorous peer-review process to ensure scientific rigor and relevance to the field. We invite contributions from researchers, clinicians, and experts in the domain of breast cancer research and treatment.

Should you have any inquiries, require additional information, or need assistance, please do not hesitate to contact us. We are dedicated to supporting your involvement in this Special Issue.

Thank you for your attention, and we eagerly anticipate receiving your insightful submissions.

Prof. Dr. Pierfranco Conte
Guest Editor

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Keywords

  • HER2-positive breast cancer
  • targeted therapy
  • anti-HER2 therapy
  • long-term impacts
  • prognostic

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Published Papers (1 paper)

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Research

11 pages, 703 KiB  
Article
High HER2 Intratumoral Heterogeneity Is Resistant to Anti-HER2 Neoadjuvant Chemotherapy in Early Stage and Locally Advanced HER2-Positive Breast Cancer
by Takaaki Hatano, Tomonori Tanei, Shigeto Seno, Yoshiaki Sota, Nanae Masunaga, Chieko Mishima, Masami Tsukabe, Tetsuhiro Yoshinami, Tomohiro Miyake, Masafumi Shimoda and Kenzo Shimazu
Cancers 2025, 17(13), 2126; https://doi.org/10.3390/cancers17132126 - 24 Jun 2025
Viewed by 397
Abstract
Background/Objectives: Breast cancer tumors possess intratumoral heterogeneity (ITH), which is associated with therapeutic resistance. Tumors with high ITH exhibit human epidermal growth factor receptor 2 (HER2) heterogeneity, affecting the effectiveness of HER2-targeted therapies. Our recent study identified HER2 ITH as an independent [...] Read more.
Background/Objectives: Breast cancer tumors possess intratumoral heterogeneity (ITH), which is associated with therapeutic resistance. Tumors with high ITH exhibit human epidermal growth factor receptor 2 (HER2) heterogeneity, affecting the effectiveness of HER2-targeted therapies. Our recent study identified HER2 ITH as an independent prognostic factor for poor outcomes in HER2-positive breast cancer. We here investigated the association between HER2 ITH and anti-HER2 neoadjuvant chemotherapy (NAC) resistance. Methods: This study included 97 patients with primary HER2-positive breast cancer treated with anti-HER2 NAC. Breast tumor samples were obtained from vacuum-assisted breast biopsy before NAC. HER2 gene amplification was assessed using fluorescence in situ hybridization (FISH), and HER2 gene copy number histograms were generated. Using the Gaussian mixture model, histogram data were analyzed and categorized into the high (HH) and low HER2 heterogeneity (LH) groups. The association between HER2 ITH and treatment response was evaluated using the pathological complete response (pCR) rate. Results: Of the 97 patients, 18 (18.6%) and 79 (81.4%) were classified into the HH and LH groups, respectively. The pCR rate in the HH group was significantly lower at 28% (5/18) than that in the LH group at 65% (51/79) (p < 0.01). Multivariate analysis of pathological parameters revealed that the most significant predictor of pCR rate was HER2 ITH (p = 0.02). Conclusions: HER2 ITH assessment may be valuable in predicting therapeutic outcomes in HER2-positive breast cancer. Our novel approach of the HER2 ITH method using FISH histograms could serve as a useful tool for predicting anti-HER2 NAC resistance. Full article
(This article belongs to the Special Issue Clinical Research and Prognosis of HER2-Positive Breast Cancer)
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