Influence of the Tumor Microenvironment on NK Cell Function in Solid Tumors

Area of Science:

• Immunology
• Cancer Biology
• Oncology

Background:

• Natural killer (NK) cells are innate lymphoid cells vital for immune responses against pathogens and tumors.
• NK cells possess potent cytotoxic activity regulated by complex signaling networks.
• Their role in tumor control and anti-metastatic effects is established in preclinical models.

Purpose of the Study:

• To review the role of NK cells in controlling solid tumor expansion and their prognostic significance in human cancers.
• To summarize mechanisms by which tumors and their microenvironment impair NK cell function.
• To evaluate current immunotherapeutic strategies for enhancing NK cell antitumor activity.

Main Methods:

• Literature review of preclinical and clinical studies.
• Analysis of mechanisms of NK cell evasion by tumors.
• Evaluation of immunotherapeutic approaches targeting NK cells.

Main Results:

• High density of tumor-infiltrating NK cells correlates with better prognosis in several human solid tumors.
• Tumor microenvironments can create immunosuppression, rendering tumors resistant to NK cell-mediated killing.
• Adoptive transfer of NK cells and chimeric antigen receptor (CAR)-NK cells are promising therapeutic strategies.

Conclusions:

• NK cells play a direct role in controlling solid tumor growth and have prognostic value.
• Understanding tumor-induced immunosuppression is key to overcoming resistance.
• Augmenting NK cell function via immunotherapy offers a viable strategy for solid tumor treatment.