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Updated: May 7, 2026

Orthotopic Transplantation of Breast Tumors as Preclinical Models for Breast Cancer
Published on: May 18, 2020
Suitable trial designs and cohorts for preventive breast cancer agents
Kathrin Strasser-Weippl1, Paul E Goss
1Center for Oncology, Hematology and Palliative Care, Wilhelminen Hospital, Montleartstrasse 36, A-1160 Vienna, Austria.
Abstract:
Effective chemoprevention of oestrogen receptor (ER)-positive breast cancer has been shown convincingly using several selective ER modulators and the aromatase inhibitor exemestane. Although these agents are well tolerated and the numbers needed-to-treat in the prevention setting are similar to other established preventive interventions, uptake has been poor in clinical practice because of difficulties in visualizing risk, predicting individual outcomes and measuring treatment benefit. In addition, new agents targeting ER-negative breast cancer are urgently needed. The development of new agents is hampered by the lack of suitable biomarkers and targets, as well as regulatory and financial considerations. Establishing breast cancer chemoprevention in standard clinical practice will require advances in many different fields, including biomarker research, the development of more powerful tools to predict and communicate the risks and benefits of treatments and establishing innovative trial designs. Furthermore, changes in regulatory procedures could reduce the size and cost of trials needed in the prevention setting. Identification of biomarkers for risk and efficacy that are easily accessible, such as blood-based biomarkers, will be key to future chemoprevention strategies.
Insights
Chemoprevention for estrogen receptor (ER)-positive breast cancer is effective but underused due to risk communication challenges. New agents and biomarkers are needed for both ER-positive and ER-negative breast cancer prevention.
Area of Science:
- Oncology
- Preventive Medicine
- Pharmacology
Background:
- Selective ER modulators and exemestane show efficacy in preventing ER-positive breast cancer.
- Current uptake of breast cancer chemoprevention is low due to challenges in risk assessment and benefit communication.
Purpose of the Study:
- To highlight the need for improved strategies in breast cancer chemoprevention.
- To identify key areas for advancement in the development and implementation of chemopreventive agents.
Main Methods:
- Review of existing chemopreventive agents for ER-positive breast cancer.
- Discussion of barriers to clinical adoption and development of new agents.
- Exploration of necessary advancements in biomarker research, risk prediction tools, and trial design.
Main Results:
- Effective chemoprevention exists for ER-positive breast cancer but faces poor clinical uptake.
- Development of agents for ER-negative breast cancer is hindered by a lack of biomarkers and targets.
- Accessible biomarkers, improved risk-benefit communication tools, and innovative trial designs are crucial.
Conclusions:
- Advances in biomarker research, risk prediction, and trial design are essential for integrating breast cancer chemoprevention into clinical practice.
- Development of accessible, blood-based biomarkers will be pivotal for future chemoprevention strategies.
- Addressing regulatory and financial considerations can facilitate the development and implementation of new chemopreventive agents.
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