Tumor microenvironment in CAR-T cell therapy for lymphoma.
Chimeric antigen receptor (CAR)-T cell therapy has proven to be a revolutionizing immunotherapeutic strategy for treating relapsed or refractory lymphoma, achieving remarkable clinical responses. However, there remain some challenges including treatment resistance and early relapse in a minor proportion of patients. The lymphoma tumor microenvironment (TME) is a heterogeneous and dynamic milieu composed of lymphoma cells, immune cells, stromal components, cytokines, and extracellular matrix proteins. CAR-T cell infusion alters the composition of TME and thus impact the endogenous immune response. Additionally, various components of the TME affect the persistence, activity and cytotoxicity of CAR-T cells, which is a key endogenous factor that impeding the efficacy of CAR-T cell therapy in lymphoma. Herein, we review the role of lymphoma TME on CAR-T cells, and discuss strategies targeting TME components to overcome resistance and improve the effectiveness of CAR-T cells.