Clinical evidence of efficient tumor targeting based on single-chain Fv antibody selected from a combinatorial...

Area of Science:

• Biotechnology
• Immunology
• Oncology

Background:

• Single-chain variable fragment (scFv) antibodies offer versatile platforms for targeted therapies.
• Combinatorial libraries and phage display enable selection of high-affinity antibodies for specific targets.

Purpose of the Study:

• To develop and validate a system for cancer targeting using engineered scFv antibodies.
• To demonstrate the efficacy of scFv-based imaging in patients with carcinoembryonic antigen (CEA)-producing cancers.

Main Methods:

• Selection of high-affinity anti-CEA scFv antibodies from combinatorial libraries using phage display.
• Production and purification of scFv antibodies in bacteria using an engineered tag.
• Iodine-123 labeling of scFv for SPECT imaging in cancer patients.

Main Results:

• The developed scFv-based system successfully located all known tumor deposits in patients with CEA-producing cancers.
• Iodine-123 labeled anti-CEA scFv demonstrated advantages over current cancer imaging technologies.
• Engineered scFv antibodies showed potential for both diagnostic and therapeutic applications.

Conclusions:

• The presented system provides an effective method for cancer targeting and imaging using engineered scFv antibodies.
• scFv antibodies produced in bacteria offer a scalable and adaptable platform for future cancer diagnostics and therapeutics.
• This approach holds promise for broader applications in oncology and other disease areas.