The DNA damage response in immunotherapy and radiation

Area of Science:

• Oncology
• Cancer Immunology
• Molecular Biology

Background:

• Deficiencies in DNA damage repair (DDR) are common in tumors.
• Targeting DDR defects therapeutically is an emerging strategy.
• DDR defects influence tumor immunogenicity and response to immunotherapy.

Purpose of the Study:

• To review the interplay between DDR pathways, radiation, and immune checkpoint inhibitor (ICI) efficacy.
• To describe mechanisms of radiation-induced immunogenicity.
• To highlight the potential of combination therapies.

Main Methods:

• Literature review of studies on DDR, radiation, and immunotherapy.
• Analysis of mechanisms linking DDR defects to immune responses.
• Discussion of clinical implications for combination therapeutics.

Main Results:

• DDR defects and ionizing radiation can enhance tumor immunogenicity.
• Cytosolic DNA sensing pathways, such as cGAS/STING, mediate radiation-induced immune responses.
• Somatic mutations and DDR defects predict response to ICI.

Conclusions:

• Understanding the DDR-immune system interaction is crucial for advancing cancer immunotherapy.
• Combination of DDR targeting agents with ICI offers a promising therapeutic avenue for advanced cancers.
• Further research into these mechanisms will expand immunotherapy's potential.