Raleukin is used in the treatment of certain immune-related disorders and cancers due to its ability to modulate T-cell activity. It enhances the proliferation and function of regulatory T cells, which helps suppress excessive immune responses. This makes it valuable in managing autoimmune diseases and preventing organ transplant rejection. Additionally, raleukin is being studied for its potential to improve the effectiveness of cancer immunotherapies by fine-tuning the immune environment. Its targeted action allows for lower doses and reduced side effects compared to broader immunosuppressants.