The goal of this study limited to working with human tissue samples is to delineate the mechanisms defining appropriate oesophageal injury and repair and to use this information to understand how these rules are dysregulated and result in cancer formation in adult patients undergoing endoluminal vacuum therapy (EVT therapy) for the treatment of perforations to the oesophagus. The main question\[s\] it aims to answer are: * to gain a deeper understanding of the processes underlying tissue regeneration and repair in the oesophagus and upper gastro-intestinal tract following physical injury * to identify the similarities in the processes of regeneration and early carcinogenesis Participants will take part in the study during their usual EVT therapy schedule. Tissue brushings and pinch biopsies will also be taken.
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Genetic changes in regenerating oesophageal tissue
Timeframe: approximately 52 months
Characterising germline mutations
Timeframe: approximately 52 months
DNA sequencing
Timeframe: approximately 52 months