University of Louisville School of Dentistry researchers have found a bacterial species responsible for gum disease, Porphyromonas gingivalis, is present in 61 percent of patients with esophageal squamous cell carcinoma (ESCC).
http://www.kyforward.com/u-of-l-researchers-find-association-between-oral-bacteria-and-esophageal-cancer/
U of L researchers find association between oral bacteria and esophageal cancer