South Korea is geographically located in East Asia, constituting the southern part of the Korean Peninsula (Fig. 1). The major administrative divisions in South Korea are nine provinces and seven metropolitan cities, with a current population of around 51.8 million and a density of 516 per km2. In 2018, a total of 28,628 patients (accounting for 11.7% of all newly diagnosed cancers) was diagnosed with lung cancer in South Korea. Lung cancer is the second most common cancer in men and the fifth most common cancer in women.