RT Book, Section A1 Longo, Dan L. A2 Chabner, Bruce A. A2 Longo, Dan L. SR Print(0) ID 1127646959 T1 Cytokines, Growth Factors, and Immune-Based Interventions T2 Harrison's Manual of Oncology, 2e YR 2016 FD 2016 PB McGraw-Hill Education PP New York, NY SN 9780071793254 LK hemonc.mhmedical.com/content.aspx?aid=1127646959 RD 2024/04/18 AB Cytokines are soluble proteins or glycoproteins that exert trophic effects on a variety of targets based on the expression of particular ligand-specific receptors on the target. All of the cytokines have not yet been identified; but at this time, more than 80 different molecules have been defined. The same cytokine can exert different effects on different cells and tissues. However, the biochemical consequences within the cell of ligand binding to its cellular receptor are similar among all the targets. A number of cytokines have been evaluated for their antitumor effects including the interferons, interleukin-1 (IL1), tumor necrosis factor, IL4, IL12, and others. The rationale for testing these agents as antitumor agents is twofold. First, many of these agents stimulate cells of the immune system, an effect that could promote the immunological killing of the tumor cells. Second, many neoplastic cells retain the cytokine receptors of their normal counterparts; thus, direct biological and potentially antitumor effects are theoretically possible.