Effect of Metabolic Health and Obesity Phenotype on the Risk of Pancreatic Cancer: A Nationwide Population-Based Cohort Study.

Background:Recently, a few studies have reported different results regarding the relationship between metabolic health and obesity phenotype and several cancers. We examined the effects of metabolic health and obesity phenotype on pancreatic cancer using a nationwide population-based cohort database. Methods:Using the Korean National Health Insurance Service-Health Screening Cohort (NHIS-HEALS), we enrolled 347,434 Korean adults who underwent a health examination between 2009 and 2010 and were followed until 2015. This population was divided into four groups based on metabolically healthy status and body mass index (BMI): metabolically healthy normal weight (MHNW), metabolically unhealthy normal weight (MUNW), metabolically healthy obese (MHO), and metabolically unhealthy obese (MUO). Results:Over a median follow-up of 6.1 (5.5-6.5) years, 886 individuals were diagnosed with pancreatic cancer. The adjusted hazard ratios (HR) for incident pancreatic cancer were 1.52 (95% confidence interval [CI] 1.27-1.81) and 1.34 (95% CI 1.12-1.61) for the MUNW and MUO phenotypes (compared to the MHNW phenotype) after adjusting for various confounding factors. However, compared to the MHNW phenotype, the MHO phenotype did not show an elevated risk of pancreatic cancer. Moreover, the HR for pancreatic cancer gradually increased with an increase in number of metabolically unhealthy components even after adjusting for BMI (p for trend < 0.001). Conclusions:Regardless of BMI, metabolically unhealthy phenotype demonstrated significantly increased risk of pancreatic cancer, whereas obese individuals with metabolically healthy phenotype did not. Impact:These findings suggest that metabolically unhealthy phenotype might represent a potential risk factor for pancreatic cancer occurrence independently of obesity.