Association of Smoking with Metabolic Volatile Organic Compounds in Exhaled Breath

Area of Science:

• Biochemistry
• Pulmonology
• Analytical Chemistry

Background:

• Lung cancer (LC) screening requires precise identification of high-risk populations.
• Metabolic byproducts, detectable via breath analysis, may offer refined LC risk assessment.
• The relationship between exhaled volatile organic compounds (VOCs) and LC risk factors remains understudied.

Purpose of the Study:

• To investigate the association between exhaled VOCs and lung cancer risk factors.
• To explore the potential of VOCs as non-invasive biomarkers for lung cancer risk.

Main Methods:

• Analysis of exhaled breath samples from 122 healthy individuals using thermal desorption coupled with gas chromatography-mass spectrometry (TD-GC-MS).
• Collection of data on smoking characteristics, air quality, and other LC risk factors.
• Application of univariate and multivariate analyses to correlate VOCs with risk factors.

Main Results:

• Significant correlations were found between specific VOCs and smoking status (7 VOCs), smoking intensity (7 VOCs), years of smoking (11 VOCs), and depth of inhalation (27 VOCs).
• Exhaled VOC profiles are demonstrably related to smoking behaviors.

Conclusions:

• Exhaled VOCs show potential as non-invasive biomarkers for assessing lung cancer risk, particularly in relation to smoking.
• Further research, including temporal stability assessments and prospective studies, is necessary to validate specific VOCs (e.g., 2,5-dimethylfuran, 4-methyloctane) as reliable lung cancer risk biomarkers.