New research has unveiled a correlation between a specific type of mouth bacteria and the development of lung cancer in those who have never smoked. While 25% of all lung cancer patients are non-smokers, researchers now believe that exposure to second-hand smoke and family history are not the only risk factors. Of the 135,000 individuals observed in this study, "having a wider number of different species of bacteria, specifically Bacteroidetes and Spirochaetes, was associated with a lower risk of developing lung cancer, [while] higher volumes of Firmicutes species of bacteria in the mouth was associated with a heightened risk for lung cancer."
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Source mentioned: Hosgood HD, Cai Q, Hua X, Long J, Shi J, Wan Y, Yang Y, Abnet C, Bassig BA, Hu W, Ji BT, Klugman M, Xiang Y, Gao YT, Wong JY, Zheng W, Rothman N, Shu XO, Lan Q. Variation in oral microbiome is associated with future risk of lung cancer among never-smokers. Thorax. 2020 Dec 14:thoraxjnl-2020-215542. doi: 10.1136/thoraxjnl-2020-215542. Epub ahead of print. PMID: 33318237.
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