Mutagen sensitivity in upper aerodigestive tract cancer: a case-control analysis

Area of Science:

• Genetics and Cancer Epidemiology
• Molecular Toxicology
• Cancer Etiology

Background:

• Interindividual variability in DNA repair capacity influences susceptibility to carcinogens.
• Chromosomal breakage assays offer an indirect measure of DNA repair efficiency.
• Upper aerodigestive tract cancers are linked to environmental exposures, but individual susceptibility varies.

Purpose of the Study:

• To assess the association between mutagen sensitivity and the risk of upper aerodigestive tract cancers.
• To investigate the combined effects of mutagen sensitivity, smoking, and alcohol consumption on cancer risk.

Main Methods:

• A case-control study involving 108 upper aerodigestive tract cancer patients and 108 matched controls.
• Utilized a cytogenetic assay to measure in vitro mutagen sensitivity (chromosomal breakage).
• Multivariate and stratified analyses were performed to evaluate risk factors and their interactions.

Main Results:

• Sixty-nine percent of cases were mutagen sensitive compared to 44% of controls.
• Mutagen sensitivity (OR=2.5), heavy smoking (OR=4.8), and heavy alcohol consumption (OR=3.1) were significant risk factors.
• Synergistic effects were observed for smoking and mutagen sensitivity (OR=23.0) and alcohol and mutagen sensitivity (OR=5.8).

Conclusions:

• Mutagen sensitivity is a significant risk factor for upper aerodigestive tract cancers.
• Individual susceptibility, particularly DNA repair capability, plays a crucial role in cancer risk.
• Understanding interindividual differences is vital for comprehensive cancer risk assessment, even with known exposures.