Abstract The field of cancer immunotherapy has evolved rapidly, offering new treatment paradigms by harnessing the body’s own immune system to target and destroy malignancies. Various immunotherapeutic approaches, including immune checkpoint inhibitors, CAR-T cell therapy, cancer vaccines, cytokine therapies, and oncolytic viruses, have shown significant promise in treating different cancer types. This review provides a comprehensive examination of the historical development and recent advances in cancer immunotherapy. We discuss the mechanisms of action of key immunotherapeutic modalities, along with their clinical applications and innovative delivery techniques. In particular, we focus on immune checkpoint inhibitors, which have revolutionized the treatment of several cancers; CAR-T cell therapy, which has provided transformative results in hematological malignancies; and the potential of cancer vaccines, cytokine therapies, and oncolytic viruses. Additionally, the review addresses the current status of clinical trials and patents in the field, offering insight into the ongoing efforts to optimize these therapies for broader clinical use. Despite the promising results achieved, this review highlights significant challenges, such as immune-mediated toxicity, resistance to treatment, and the need for more effective delivery systems. While cancer immunotherapy has shown great potential in improving patient outcomes, overcoming existing obstacles such as toxicity and resistance remains a major challenge. This review offers a comprehensive overview of the state of cancer immunotherapy while also providing perspectives on its future directions and the ways in which these innovations may impact cancer treatment.
Devaraji et al. (2025) studied this question.