Use of tumor receptors for diagnostic imaging. A review

Area of Science:

• Oncology
• Biomedical Engineering
• Pharmacology

Background:

• Targeted cancer therapies utilize 'warheads' delivered by binders to tumor receptors.
• Specificity in binder-receptor interactions is crucial for maximizing therapeutic effects and minimizing side effects.
• Antibodies are effective binders, but their in-target cell accumulation (homing) is often below 10%.

Purpose of the Study:

• To review the role of binders in targeted cancer therapy.
• To discuss the specificity of binder-receptor interactions for improved drug delivery.
• To highlight the limitations of current antibody-based delivery systems and imaging techniques.

Main Methods:

• Review of existing literature on targeted drug delivery systems.
• Analysis of binder-receptor interactions and their impact on therapeutic efficacy.
• Comparison of radioimmunoimaging with conventional diagnostic methods.

Main Results:

• High specificity of binder-receptor reactions enhances drug accumulation in tumors and reduces off-target toxicity.
• Suboptimal homing of antibodies leads to significant distribution of 'warheads' in normal tissues or systemic clearance.
• Current radioimmunoimaging techniques do not surpass conventional imaging modalities in diagnostic yield.

Conclusions:

• Improving binder specificity and homing is essential for enhancing the efficacy of targeted cancer therapies.
• Further research is needed to overcome the limitations of antibody-based delivery and improve diagnostic imaging in oncology.
• Reducing side effects from irradiation or chemotherapy necessitates advancements in targeted treatment strategies.