Bacteria that cause gum disease, Porphyromonas gingivalis, frequently infect the esophageal tissues of patients with esophageal squamous cell carcinoma (ESCC), were associated with ESCC progression, and serve as a potential biomarker for ESCC. These results suggest that P gingivalis infection might be a risk factor for ESCC.1
http://www.oncologynurseadvisor.com/head-and-neck-cancer/gum-disease-bacteria-can-speed-esophageal-cancer-progression/article/485013/
Gingivitis Bacteria Associated With Esophageal Cancer