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Advanced non-small cell lung cancer (NSCLC) remains an incurable disease. Immunotherapies that activate patients' T cells against resident tumor cells are being developed; however, these approaches may not be effective in NSCLC patients due to tumor-induced immune suppression. A major cause of immune suppression is myeloid-derived suppressor cells (MDSC). Because of the strategic role of CD4(+) T lymphocytes in the activation of cytotoxic CD8(+) T cells and immune memory, we are developing cell-based vaccines that activate tumor-specific CD4(+) T cells in the presence of MDSC. The vaccines are NSCLC cell lines transfected with costimulatory (CD80) plus major histocompatibility complex class II (MHC II) genes that are syngeneic to the recipient. The absence of invariant chain promotes the presentation of endogenously synthesized tumor antigens, and the activation of MHC II-restricted, tumor-antigen-specific CD4(+) T cells.

Lung cancer patients’ CD4+ T cells are activated in vitro by MHC II cell-based vaccines despite the presence of myeloid-derived suppressor cells