Purpose@#This study aimed to provide the clinical characteristics,
prognostic factors , and 5-year relative
survival rates of
lung cancer diagnosed in 2015. @*Materials and
Methods @#The demographic
risk factors of
lung cancer were calculated using the KALC-R (Korean
Association of
Lung Cancer Registry ) cohort in 2015, with
survival follow-up until December 31, 2020. The 5-year relative
survival rates were estimated using Ederer II
methods , and the general
population data used the
death rate adjusted for
sex and age published by the
Korea Statistical
Information Service from 2015 to 2020. @*Results@#We enrolled 2,657
patients with
lung cancer who were diagnosed in
South Korea in 2015. Of all
patients , 2,098 (79.0%) were diagnosed with non–
small cell lung cancer (NSCLC) and 345 (13.0%) were diagnosed with
small cell lung cancer (SCLC), respectively. Old age, poor performance status, and advanced clinical stage were independent
risk factors for both NSCLC and SCLC. In addition, the 5-year relative
survival rate declined with advanced stage in both NSCLC (82%, 59%, 16%, 10% as the stage progressed) and SCLC (16%, 4% as the stage progressed). In
patients with stage IV
adenocarcinoma , the 5-year relative
survival rate was higher in the presence of
epidermal growth factor receptor (EGFR)
mutation (19% vs. 11%) or
anaplastic lymphoma kinase (ALK) translocation (38% vs. 11%). @*Conclusion@#In this Korean nationwide
survey , the 5-year relative
survival rates of NSCLC were 82% at stage I, 59% at stage II, 16% at stage III, and 10% at stage IV, and the 5-year relative
survival rates of SCLC were 16% in cases with limited
disease , and 4% in cases with extensive
disease .