Cancer immunotherapy has transformed cancer treatment, with immune checkpoint blockade therapy and adoptive cell therapy becoming standard care for many cancer types. Recent evidence suggests that CD4(+)T cells play a significant role in the anti-tumour immune response, highlighting their potential importance in cancer immunotherapies.
Cancer immunotherapy has revolutionised cancer treatment, with immune checkpoint blockade (ICB) therapy and adoptive cell therapy (ACT) increasingly becoming standard of care across a growing number of cancer indications. While the majority of cancer immunotherapies focus on harnessing the anti-tumour CD8(+)cytotoxic T cell response, the potential role of CD4(+)'helper' T cells has largely remained in the background. In this review, we give an overview of the multifaceted role of CD4(+)T cells in the anti-tumour immune response, with an emphasis on recent evidence that CD4(+)T cells play a bigger role than previously thought. We illustrate their direct anti-tumour potency and their role in directing a sustained immune response against tumours. We further highlight the emerging observation that CD4(+)T cell responses against tumours tend to be against self-derived epitopes. These recent trends raise vital questions and considerations that will profoundly affect the rational design of immunotherapies to leverage on the full potential of the immune system against cancer.
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