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MediumGastroenterologyOesophageal Cancer (suspected)ukmlamrcgp aktpanemrcem sbamrcp part 1prescribing safety assessment

A 55-year-old man presents with difficulty swallowing (dysphagia), initially for solids but now progressing to liquids over the past 3 months. He reports associated unintentional weight loss of 5kg. He is a lifelong smoker and drinks alcohol regularly. What is the most important investigation to perform urgently?

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