Abstract
Numerous effector cells of the immune system are capable of killing tumor cells in vitro as well as in vivo when properly activated. Antigen-specific T lymphocytes when exposed to certain tumor-specific antigens (TSA) in association with self MHC antigen can be triggered to produce tumor-specific cytotoxic cells in the presence of a second signal derived from T helper cells, now recognized as interleukin-2 (IL-2). However, only a small minority of spontaneously-derived tumors express TSA1. Secondly, T lymphocytes infiltrating tumor sites often remain inactive in situ because of host or tumor-related suppressor mechanisms, so that immunotherapy employing IL-2 alone may not be fully effective. However, the findings that tumor-infiltrating lymphocytes (TIL), when adoptively transferred, can selectively migrate to the tumor site, have led to promising therapeutic strategies employing IL-2 therapy in combination with TIL, or therapy with genetically modified TIL designed to deliver tumoricidal molecules at the tumor site2. Other anti-tumor effector cells do not require antigen-specific priming. These are natural killer (NK) lymphocytes and macrophages. When appropriately activated, e.g. with IL-2 or IL-2 in combination with other cytokines, these cells can kill a large spectrum of tumor cells in vitro as well as in vivo, and thus constitute a major effector arm of IL-2 therapy. Both these cell classes, NK cells in particular, represent a major component of the tumor-infiltrating mononuclear cells3,6. However, these cells also remain inactive in situs 5,6 and may resist adequate activation with IL-2 therapy alone. Our aims have been to elucidate the mechanisms underlying this inactivation and exploit this information to achieve maximal in situ activation of all killer cell lineages for eradication of the metastatic disease.
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Lala, P.K. et al. (1993). Combination of Chronic Indomethacin and Intermittent IL-2 Therapy in the Treatment of Disseminated Cancer. In: Garaci, E., Goldstein, A.L. (eds) Combination Therapies 2. Springer, Boston, MA. https://doi.org/10.1007/978-1-4615-2964-4_18
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DOI: https://doi.org/10.1007/978-1-4615-2964-4_18
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