One of the main problems facing current cancer therapies, including chemotherapy and immunotherapy, is the poor functionality of the blood vessels present in tumours. Indeed, tumour blood vessels are highly abnormal, and this leads to poor perfusion, resulting in poor delivery of oxygen to the tumour. This has profound consequences for cancer therapies, as the lack of oxygen in the tumours impedes the tumour-killing functions of immune cells or the diffusion and efficacy of cancer drugs.