Targets for improving tumor response to radiotherapy

Area of Science:

• Oncology
• Immunology
• Radiology

Background:

• Radiotherapy is a primary cancer treatment but often results in tumor recurrence.
• The tumor microenvironment (TME) presents challenges to radiotherapy efficacy.
• Targeting specific pathways within the TME can sensitize tumors to radiation.

Purpose of the Study:

• To review the TME's response to radiotherapy.
• To identify potential targets for enhancing tumor response to radiotherapy.
• To explore novel therapeutic combinations for improved cancer treatment.

Main Methods:

• Review of experimental and clinical studies on TME targets.
• Analysis of molecular pathways involved in tumor radioresistance.
• Evaluation of drug and antibody combinations with radiotherapy.

Main Results:

• Inhibition of apoptosis/survival targets, COX-2, PI3K, mTOR, MAPKs, and VEGF shows promise.
• Receptor tyrosine kinase (RTK) inhibitors, particularly EGFR inhibitors, are being investigated.
• Immune checkpoint inhibitors (ICIs) like PD-L1 and CTLA-4 inhibitors demonstrate significant potential, especially with hypofractionated radiotherapy.

Conclusions:

• Modulating the TME offers a promising strategy to overcome radiotherapy resistance.
• Combination therapies, including ICIs, represent a future direction for cancer treatment.
• Further research into TME targets can lead to more effective radiotherapy regimens.