Chimeric Antigen Receptor-T Cells for Targeting Solid Tumors: Current Challenges and Existing Strategies

Area of Science:

• Oncology
• Immunotherapy
• Cellular Therapy

Background:

• Chimeric antigen receptor-T cell (CAR-T) therapy has achieved success in B cell malignancies.
• Translating CAR-T success to solid tumors is hindered by unique tumor microenvironments and antigen heterogeneity.

Purpose of the Study:

• To review challenges limiting CAR-T efficacy in solid tumors.
• To highlight preclinical and clinical strategies addressing these challenges.

Main Methods:

• Review of current literature on CAR-T therapy in solid tumors.
• Analysis of challenges including tumor microenvironment, antigen expression, and tumor plasticity.
• Identification of therapeutic strategies to enhance CAR-T function in solid tumors.

Main Results:

• Solid tumors present significant barriers to CAR-T infiltration and function compared to hematological malignancies.
• Limited and heterogeneous tumor antigen expression poses specificity and potency issues.
• Immune-suppressive tumor microenvironments impair CAR-T cell activity, expansion, and persistence.

Conclusions:

• Overcoming solid tumor-specific challenges is crucial for advancing CAR-T therapy.
• Novel preclinical and clinical strategies are being developed to improve CAR-T effectiveness against solid tumors.