Innate myeloid cells in the tumor microenvironment.

Area of Science:

• Oncology
• Immunology
• Cancer Research

Background:

• Cancer immunotherapies show promise but benefit only a subset of patients.
• Therapeutic resistance limits the effectiveness of current cancer immunotherapies.
• The tumor microenvironment (TME) significantly influences immunotherapy outcomes.

Purpose of the Study:

• To review recent findings on the mechanisms of immunotherapeutic resistance.
• To compare the pro-tumor and immunosuppressive functions of myeloid cells within the TME.
• To identify novel therapeutic strategies for enhancing cancer immunotherapy.

Main Methods:

• Literature review of current research on tumor-infiltrating myeloid cells.
• Analysis of studies investigating myeloid cell interactions with anti-tumor lymphocytes.
• Comparison of immunosuppressive and pro-tumorigenic mechanisms employed by myeloid cells.

Main Results:

• Myeloid cells, including monocytes, macrophages, granulocytes, and myeloid-derived suppressor cells, critically regulate anti-tumor immune responses.
• These myeloid cells employ diverse pro-tumor and immunosuppressive mechanisms within the TME.
• Specific pathways utilized by these cells are being identified and characterized.

Conclusions:

• Targeting tumor-infiltrating myeloid cells offers a promising avenue for overcoming immunotherapy resistance.
• Understanding the specific functions of these myeloid cells is crucial for developing next-generation cancer therapies.
• Exploiting these mechanisms could lead to novel treatments that boost the efficacy of existing immunotherapies.