Human Papillomavirus Is Associated With Adenocarcinoma of Lung: A Population-Based Cohort Study

BackgroundRecent trends in the incidence of lung cancer have been reported despite the decreasing rate of smoking. Lung cancer is ranked among the top causes of cancer-related deaths. The ratio of adenocarcinoma to squamous cell carcinoma, as well as the ratio of women to men, is still increasing. Human papillomavirus (HPV) has been discovered in lung cancer tissues and blood specimens, particularly in Eastern countries. However, the association between HPV infection and lung adenocarcinoma remains unclear. MethodsThis population-based cohort study was conducted using data from Taiwan's single-payer national health insurance and cancer registry databases. Data on HPV infection, cancer, sex, age, comorbidities, urbanization, and occupation were collected. The cumulative incidence rates were generated using Kaplan-Meier curves and log-rank tests. COX regression analysis was used to estimate the hazard ratios of factors associated with cancer occurrence. We used data from 2007 and 2015. The cases were matched with sex and age in a 1:2 manner with 939,874 HPV+ and 1,879,748 HPV- individuals, respectively. ResultsThe adjusted hazard ratios [95% confidence interval (CI)] for HPV infection in all lung cancers were 1.539 (1.436-1.649), male lung cancer 1.434 (1.312-1.566), female lung cancer 1.742 (1.557-1.948), squamous cell carcinoma (SCC) 1.092 (0.903-1.320), male SCC 1.092 (0.903-1.320), female SCC 0.949 (0.773-1.164), adenocarcinoma 1.714 (1.572-1.870), male adenocarcinoma 1.646 (1.458-1.858), and female adenocarcinoma 1.646 (1.458-1.858). The highest adjusted hazard ratio for lung cancer was chronic obstructive pulmonary disease (COPD) 1.799 (1.613-2.007), followed by male sex 1.567 (1.451-6.863) and HPV infection. The highest adjusted hazard ratio for adenocarcinoma was HPV infection 1.714 (1.572-1.870), followed by COPD 1.300 (1.102-1.533), and for SCC, male sex 5.645 (4.43-3.37), followed by COPD 2.528 (2.002-3.192). ConclusionOur study showed that HPV infection was associated with the occurrence of adenocarcinoma of the lung in both men and women but was not associated with SCC of the lung.

Automated summary

Despite the decreasing rate of smoking, there has been an increase in the incidence of lung cancer. The ratio of adenocarcinoma to squamous cell carcinoma and the ratio of women to men in lung cancer cases are still increasing. Human papillomavirus (HPV) has been found in lung cancer tissues and blood specimens, especially in Eastern countries, but its association with lung adenocarcinoma remains unclear.