Beyond Conventional CARs: Expanding the Targetable Antigen Landscape in CAR-T Cell Therapy.

Expanding the Horizon of CAR-T Cell Therapy: Present Obstacles and New Strategies for Future CARs in Solid Tumors.

Chimeric antigen receptor (CAR)-T cells are synthetic receptors used for the recognition of specific antigens expressed by reprogrammed T cells for targeting tumors. CAR-T cell therapy has gained remarkable clinical success for the treatment of hematological malignancies such as chronic lymphocytic leukemia (CLL), mantle cell lymphoma (MCL), diffuse large B-cell lymphoma (DLBCL), lymphoplasmacytic lymphoma (LPL), and primary intraocular lymphoma (PIL). The increasing number of preclinical investigations and clinical trials is focusing on extending CAR-T cell therapy to solid tumors due to its remarkable success in leukemia and lymphoma cancers. However, some limitations of CAR-T therapy still exist, including a lack of targetable antigen diversity, heterogeneous antigen expression, insufficient T-cell trafficking efficiency, and an immunosuppressive tumor microenvironment. This review explores the role of CAR-T cell therapy, current challenges, and emerging solutions for solid tumor malignancies. To overcome the existing limitations of CAR-T cell therapy, innovative strategies, including the optimization of novel CAR vectors with checkpoint inhibitors, have been designed to enhance the antitumor activity of CAR-T cells against solid tumors. It also explores the design of novel CAR-T cells and strategies for improving antitumor activity against solid tumors. Among the emerging strategies, universal CARs and combination approaches with checkpoint inhibitors are especially promising for extending CAR-T therapy to solid tumors.

The Evolution of FAP-Targeted CAR T-Cell Therapy in Solid Tumors: From Immunotherapy to Immunotheranostic Applications

Chimeric antigen receptor (CAR) T-cell therapy has revolutionized the treatment landscape of hematologic malignancies but has demonstrated limited efficacy in solid tumors, mainly due to the complex and immunosuppressive tumor microenvironment (TME). Among the strategies to overcome this challenge, targeting the tumor stroma rather than the tumor cells themselves has gained increasing interest. In this context, fibroblast activation protein alpha (FAP), a cell surface protease overexpressed by cancer-associated fibroblasts, represents a promising target. With the aim of remodeling the TME, enhancing immune infiltration, and suppressing tumor growth, numerous FAP-directed CAR T-cell therapies have been developed in the last decade, leading to the clinical translation of two candidates. To improve the flexibility and safety profile of CAR T-cell therapies, several groups have designed more controllable and modular approaches, including adapter CAR T-cell systems, which enable on-demand activation of effector cells through the administration of an adapter molecule. In parallel, the development of FAP-targeted radiotracers, particularly FAP inhibitors (FAPIs), has enabled high-contrast imaging of solid tumors and introduced attractive opportunities for radioligand therapy. The convergence of these advances has given rise to immunotheranostic strategies that integrate CAR T-cell immunotherapy and radioligand delivery within a unified framework. This review traces the evolution of FAP-directed CAR T-cell strategies, from conventional designs to adapter-based and theranostic platforms, and examines how modular adapters bring immunotherapy and radioligand delivery together within a single immunotheranostic framework, across preclinical and clinical settings.

Emerging target antigen landscape for CAR T-cell therapy in solid tumors: current advances and future directions

Emerging CAR-T Cell Therapies for T Cell Malignancies: Innovations, Challenges, and Future Directions

Continued efforts to identify highly specific target antigens, optimize manufacturing processes, enhance safety, and integrate CAR-T therapy with complementary immunotherapeutic approaches are expected to improve clinical outcomes and broaden the application of CAR-T therapy to T-cell malignancies and potentially other solid and hematologic cancers.

In vivo CAR‑T therapy: recent progress and future directions

Engineering CAR-T cells for solid tumors: overcoming antigenic, trafficking, and microenvironmental barriers

Next-generation engineering strategies are being designed to overcome the obstacles that constrain CAR-T-cell efficacy in solid tumors and to guide the development of safer and more effective therapeutic platforms.