All three medications are common—approximately 35 million people take a statin to control cholesterol; more than 120 million people take metformin to control diabetes and between 6 and 10 million people take aspirin daily.
The aim of this study was to investigate the associations of aspirin, metformin, and statins with lung cancer risk and mortality using population-based nationwide cohort data from The Korean National Health Insurance Services (KNHIS) database was used in the present study. The KNHIS is a universal health care system that covers the entire Korean population of 50 million.