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A generally applicable, easy-to-use method of focusing a patient's immune system to eradicate or prevent cancer has been elusive. We are attempting to develop a targeted virus to accomplish these aims. We previously created a recombinant replicating vesicular stomatitis virus (VSV) that preferentially infected Her2/neu expressing breast cancer cells and showed therapeutic efficacy in an implanted Balb/c mouse tumor model. The current work shows that this therapy generated therapeutic anti-tumor CD4 T cells against multiple tumor antigens. CD4 T cells transferred directly from cured donor mice could eradicate established tumors in host mice. T cells were transferred directly from donor mice and were not stimulated ex vivo. Both tumors that expressed Her2/neu and those that did not were cured by transferred T cells. Analysis of cytokines secreted by anti-tumor memory CD4 T cells displayed a multifunctional pattern with high levels of interferon-γ, interleukin (IL)-4 and IL-17. Anti-tumor memory CD4 T cells traveled to the mesenteric lymph nodes and were activated there. Treatment with targeted recombinant replicating VSV is a potent immune adjuvant that generates therapeutic, multifunctional anti-tumor memory CD4 T cells that recognize multiple tumor antigens. Immunity elicited by viral therapy is independent of host major histocompatibility complex or knowledge of tumor antigens. Virus-induced tumor immunity could have great benefit in the prevention and treatment of tumor metastases.

Treatment with targeted vesicular stomatitis virus generates therapeutic multifunctional anti-tumor memory CD4 T cells