The study is aimed to determine the potential of volatile marker testing for identification of gastrointestinal cancers (in particular - colorectal and gastric cancers), the related precancerous lesions in the stomach and colon. The study will be addressing the role of confounding factors, including lifestyle factors, diet, smoking as well as addressing the potential role of microbiota in the composition of exhaled volatile markers.
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Performance of nanoarray sensor testing to detect target lesions
Timeframe: At the time of breath sampling
VOCs differentiating the study groups
Timeframe: At the time of breath sampling