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Studying Triple Negative Breast Cancer Using Orthotopic Breast Cancer Model
Published on: March 20, 2020
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Immunotherapy in breast cancer.
Soley Bayraktar1,2, Sameer Batoo1, Scott Okuno1
1Department of Medicine, Division of Medical Oncology and Hematology, Mayo Clinic Health System, Eau Claire, WI, USA.
Journal of Carcinogenesis
|June 5, 2019
Summary
Immunotherapy, using the immune system to fight cancer, has advanced significantly. While immune checkpoint inhibitors (ICIs) show promise in many cancers, their efficacy in breast cancer (BC) remains limited, prompting further research and clinical trials.
Area of Science:
- Oncology
- Immunology
- Cancer Research
Background:
- The concept of cancer immunotherapy is over a century old, with recent molecular advancements deepening our understanding of immune system regulation.
- Key discoveries include checkpoint regulation, T-regulatory cells (Tregs), Th1/Th2 responses, Chimeric antigen receptor (CAR)-T cells, and the roles of dendritic cells and macrophages.
- These insights led to the development of immune checkpoint inhibitors (ICIs), recognized by the 2018 Nobel Prize in Medicine awarded to Drs. Allison and Honjo for their work on CTLA-4 and PD-1/PD-L1, respectively.
Purpose of the Study:
- To review the current landscape of cancer immunotherapy, focusing on its application and challenges in breast cancer (BC).
- To discuss the role of the immune system in breast cancer progression and the potential impact of emerging immunotherapeutic strategies.
- To highlight the limitations of current predictive biomarkers for immunotherapy in BC and explore strategies to enhance treatment efficacy.
Main Methods:
- Review of existing literature on cancer immunotherapy, immune system regulation, and breast cancer.
- Analysis of clinical trial data and regulatory approvals for immune checkpoint inhibitors (ICIs).
- Discussion of predictive biomarkers such as PD-1/PD-L1 expression, microsatellite instability-high (MSI-high), and tumor mutational burden (TMB).
Main Results:
- Several ICIs are approved for various cancers, but none are currently approved for breast cancer (BC).
- Predictive markers like PD-1/PD-L1, MSI-high, and TMB are less frequently expressed in BC subsets compared to other solid tumors.
- Clinical trials are actively investigating strategies to improve ICI efficacy in BC, including combination with chemotherapy.
Conclusions:
- Breast cancer (BC) exhibits unique immunological characteristics that limit the effectiveness of current immunotherapies.
- Further research and clinical trials are crucial to identify optimal immunotherapy strategies and predictive biomarkers for breast cancer patients.
- Combining immunotherapy with other modalities, such as chemotherapy, represents a promising avenue for improving outcomes in breast cancer.
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