The main goal in cancer treatment is to eliminate tumor cells with minimal harm to healthy tissue. The immune system is ideal for this task as it can identify and eliminate abnormal cells while providing long-term defense against recurrence. Various immune-based cancer treatments activate the immune system or help cancer cells recognize and activate immune cells within the tumor. Immunoregulatory cytokines play a crucial role in treating immune disorders. They regulate macrophage degradation of antigens and promote cellular functions. Lymphocyte interactions can lead to immune cell maturation, while other products limit lymphocyte activation. Cytokines are categorized as interleukins, growth factors, interferons, and colony-stimulating factors. Soluble proteins known as cytokines are essential for mediating and regulating cell interactions in various parts of the body, including the nervous system, gut, and bone remodeling. The study of cytokines’ structure and function has proven incredibly beneficial for both immunology and commercial research. By understanding the different domains and analogues of cytokines, researchers have gained important knowledge about how these proteins bind to receptors. Moreover, identifying similarities between various cytokines has offered valuable insights into the workings of cytokine receptors. Understanding the mechanisms behind immunotherapy resistance is important to identify new therapeutic targets. By investigating these pathways, researchers can develop innovative strategies to overcome resistance and improve treatment outcomes. Combining therapeutic modalities to target multiple aspects of the tumor microenvironment simultaneously can overcome the limitations of individual treatments and improve antitumor response. Understanding resistance mechanisms to immunotherapies can lead to the development of tailored strategies to combat treatment resistance and maximize treatment response.