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Chuckles the Clown has a 50-pack year smoking history but quit five years ago. Over the last eight months, he reports an intermittent burning sensation in his chest, along with an excess amount of belching and nausea. He notices these symptoms are worse when lying down for bed and after eating acidic foods. With Chuckles' history coupled with his presenting symptoms, which of the following types of esophageal cancer is most likely associated with his presentation?