23 Assessment of T-Cell Immune Dysfunction in Patients with Renal Cell Carcinoma
Functional T cells are the central component of an effective antitumor immune response. However, in patients with renal cell carcinoma (RCC), the growth of antigenic tumors proceeds in the absence of significant T-cell responses, posing a distinct obstacle to the development of effective immunotherapy strategies and cancer vaccines. The minimum required elements of a functional antitumor immune T-cell response have been identified, including T cells that can preferentially recognize tumor-associated antigens (1 ). However, despite increasing evidence that T-cells recognize discrete tumor antigen, transformed cells continue to evade immune destruction, and tumors thereby progress. There is now little doubt that the immune response to tumor antigens is altered in patients with cancer (2 ). This rarely manifests clinically as generalized immune suppression, which may reflect the antigen specificity of the immune dysfunction in the initial stages of the disease.
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