NK cells in breast cancer
Andréa Massidda1, Santiago Moragon-Terencio2, Camille Baudesson de Chanville1
1Aix Marseille Université, Centre National de la Recherche Scientifique, Institut National de la Santé et de la Recherche Médicale (INSERM), Centre d'Immunologie de Marseille-Luminy, Marseille, France.
Abstract:
Natural killer (NK) cells are effectors of innate antitumor immunity, yet their therapeutic potential in solid tumors remains largely unrealized. Breast cancer exemplifies this paradox: NK cells are present in circulation and detectable within tumors, but their cytotoxic activity is limited. Recent advances in single-cell and spatial profiling reveal that NK-cell failure in breast cancer does not result from simple immune absence but from multilayered constraints imposed by the tumor ecosystem. Soluble mediators, metabolic pressures, stromal architecture, and suppressive immune networks reprogram NK-cell identity and uncouple activation from cytotoxicity. Understanding how these constraints shape NK-cell states reframes breast cancer as a model of innate immune dysfunction and highlights new opportunities to reestablish NK-cell function through immunotherapies.
Insights
Natural killer (NK) cells show limited effectiveness in breast cancer due to tumor microenvironment constraints. New immunotherapies can potentially overcome these barriers to restore anti-tumor immunity.
Area of Science:
- Immunology
- Oncology
- Cell Biology
Background:
- Natural killer (NK) cells are crucial for innate antitumor immunity.
- Their therapeutic application in solid tumors, particularly breast cancer, is limited.
- NK cells are present in breast tumors but exhibit reduced cytotoxic activity.
Purpose of the Study:
- To investigate the reasons behind NK cell dysfunction in breast cancer.
- To identify the multilayered constraints imposed by the tumor ecosystem on NK cells.
- To explore novel immunotherapy strategies for enhancing NK cell function.
Main Methods:
- Utilized single-cell and spatial profiling techniques.
- Analyzed the impact of soluble mediators, metabolic pressures, and stromal architecture.
- Investigated the role of suppressive immune networks in reprogramming NK cells.
Main Results:
- NK cell failure in breast cancer is due to complex tumor ecosystem constraints, not immune absence.
- Soluble factors, metabolic challenges, stromal components, and immune networks reprogram NK cells.
- These factors uncouple NK cell activation from their cytotoxic function.
Conclusions:
- Breast cancer serves as a model for understanding innate immune dysfunction.
- Targeting tumor microenvironment constraints offers new avenues for immunotherapy.
- Reestablishing NK cell function is a promising strategy for improving breast cancer treatment.
