Evaluation of Risk Factors for Lung Cancer Among Never Smokers and Their Association With Common Driver Mutations

Area of Science:

• Oncology
• Epidemiology
• Environmental Health

Background:

• Tobacco use is the primary cause of most lung cancers.
• A significant proportion of lung cancers, particularly adenocarcinomas, occur in never smokers.
• Identifying risk factors for lung cancer in non-smokers is crucial for public health.

Purpose of the Study:

• To assess risk factors associated with lung cancer in a non-smoking population.
• To evaluate histological subtypes, staging, and performance status in non-smoker lung cancer cases.
• To explore potential links between risk factors and common driver mutations in lung cancer.

Main Methods:

• A single-center, observational, case-control study was conducted.
• 145 lung cancer cases and 297 controls who were non-smokers were included.
• Statistical analyses, including chi-square tests and logistic regression, were used to examine associations between various risk factors and lung cancer.

Main Results:

• Adenocarcinoma was the predominant histological subtype (92.4%) in non-smoker lung cancer cases.
• Significant risk factors included high-risk occupations, indoor biomass fuel use without ventilation, low body mass index (BMI), and a family history of lung cancer.
• Environmental factors, proximity to heavy industry, and dietary habits also showed significant associations; however, no association was found between driver mutations and studied risk factors.

Conclusions:

• Non-smoking-related lung cancer is multifactorial, with significant associations found for occupational exposures, indoor air pollution, low BMI, and family history.
• The high prevalence of adenocarcinoma in this cohort warrants further investigation.
• Findings emphasize the need for tailored risk assessments and preventive strategies for non-smokers at risk of lung cancer.