Current targeting strategies for adenovirus vectors in cancer gene therapy

Area of Science:

• Oncology
• Gene Therapy
• Virology

Background:

• Adenovirus vectors (Adv) are widely used in cancer gene therapy research.
• Despite preclinical success, clinical utility is limited by inefficient gene transfer, poor tumor transduction, and liver accumulation.

Purpose of the Study:

• To review current targeting strategies for Adv to overcome clinical limitations.
• To explore methods for enhancing Adv-mediated gene transfer and specificity in cancer therapy.

Main Methods:

• Genetic modification of viral coat proteins for transductional selectivity.
• Utilizing tumor-specific promoters for transcriptional selectivity.
• Conjugation with targeting ligands (e.g., PEG, antibodies, peptides) for selective biodistribution.

Main Results:

• Targeting strategies aim to improve Adv receptor-mediated entry into tumor cells.
• Tumor-specific promoters enhance transgene expression only in cancer cells.
• Ligand conjugation and combined approaches improve biodistribution and reduce off-target effects.

Conclusions:

• Targeting strategies are crucial for overcoming Adv limitations in cancer gene therapy.
• Combining selective biodistribution with active targeting ligands offers a promising approach.
• Further research into Adv targeting will enhance their clinical utility in treating cancer.