The experimental nasal swab relies on the fact that most lung cancer patients are current and former smokers. It's meant to be a noninvasive means of separating high-risk patients from low-risk patients, by spotting signs of gene damage produced by long-term exposure to cigarette smoke.
from WebMD Health https://www.webmd.com/lung-cancer/news/20191024/nasal-swab-could-help-gauge-smokers-odds-for-lung-cancer?src=RSS_PUBLIC
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