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A group of drugs commonly used to treat erectile dysfunction may be able to boost the effect of chemotherapy in oesophageal cancer, according to new research funded by Cancer Research UK and the Medical Research Council. The research, published on Tuesday (June 22) in Cell Reports Medicine, found that the drugs, known as PDE5 inhibitors can reverse chemotherapy resistance by targeting cells called cancer-associated fibroblasts (CAFs) residing in the area surrounding the tumour. Although this is early discovery research, PDE5 inhibitors combined with chemotherapy, may be able to shrink some oesophageal tumours more than chemotherapy could alone, tackling chemotherapy resistance, which is one of the major challenges in treating oesophageal cancer. Oesophageal cancer affects the food pipe that connects the mouth to the stomach, and while it is a relatively rare cancer, the UK has one of the higher rates in the world, with 9,300 new oesophageal cancer cases in the UK every year. Resistance to chemotherapy in oesophageal cancer is influenced by the tumour microenvironment, the area that sounds the tumour. This is made up of molecules, blood vessels, and cells such as cancer associated fibroblasts (CAFs), which are important for tumour growth. It feeds the tumour and can act as a protective cloak, preventing treatments like chemotherapy from having an effect.