PMID: 9181454May 1, 1997Paper

Reversal of tumor-induced immunosuppression: a new approach to cancer therapy

Journal of Immunotherapy
S Wojtowicz-Praga

Abstract

Many studies show defective immune responses in patients diagnosed with cancer. Most of the diverse nonspecific approaches used to stimulate the immune system to recognize and destroy abnormal tumor cells have limited clinical utility. Attempts to identify tumor-specific antigens and to improve the antigen presentation were equally disappointing. It appears that some of these failures can be explained by tumor-induced immunosuppression. A large number of cytokines, hormones, and other molecules secreted by tumors were demonstrated to have immunomodulating properties. The most extensively studied immunosuppressive molecules secreted by tumors are transforming growth factor-beta (TGF beta), interleukin 10 (IL-10), and prostaglandin E2 (PGE2). TGF beta in particular may play a key role in tumor-induced immunosuppression. It is the most potent immunosuppressor described to date, and it has been consistently isolated from variety of tumor cell lines and detected in plasma of tumor-bearing hosts. Level of TGF beta production by tumor cells correlates with their metastatic potential, and TGF beta neutralization not only prevents development of metastases, but also inhibits growth or completely eradicates tumors as diverse as breast ca...Continue Reading

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