Obesity fuels tumour growth by suppressing the immune system’s response to cancer, but it could also render tumours particularly sensitive to certain cancer drugs. Compared with T cells in thin mice, T cells in obese mice had higher levels of a protein called PD-1, which suppresses immune responses.

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Obesity fuels tumour growth by suppressing the immune system’s response to cancer, but it could also render tumours particularly sensitive to certain cancer drugs. Compared with T cells in thin mice, T cells in obese mice had higher levels of a protein called PD-1, which suppresses immune responses.