Geographical Variations and Trends in Major Cancer Incidences throughout Korea during 1999-2013

We aimed to describe the temporal trends and district-level geographical variations in cancer incidences throughout Korea during 1999-2013.

Data were obtained from the Korean National Cancer Incidence Database. We calculated the age-standardized cumulative cancerincidences according to sex and geographicalregion (metropolitan cities, provinces, and districts) for three 5-year periods (1999-2003, 2004- 2008, and 2009-2013). Each quintile interval contained the same number of regions. Disease maps were created to visualize regional differences in the cancer incidences.

Substantial differences in cancer incidences were observed according to district and cancer type. The largest variations between geographical regions were found for thyroid cancer among both men and women. There was little variation in the incidences of stomach, colorectal, and lung cancer according to geographical region. Substantially elevated incidences of specific cancers were observed in Jeollanam-do (thyroid); Daejeon (colorectum); Jeollanam-do, Gyeongsangbuk-do, and Chungcheongbuk-do (lung); Seocho-gu, Gangnam-gu and Seongnam, Bundang-gu (breast and prostate); Chungcheong and Gyeongsang provinces (stomach); Ulleung-gun and the southern districts of Gyeongsangnam-do and Jeollanam-do (liver); and along the Nakdonggang River (gallbladder and biliary tract).

Mapping regional cancer incidences in Korea allowed us to compare the results according to geographical region. Our results may facilitate the development of infrastructure for systematic cancerincidence monitoring,which could promote the planning and implementation of region-specific cancer management programs.