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Regional disparities in major cancer incidence in Korea, 1999-2018
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Eun Hye Park, Mee Joo Kang, Kyu-Won Jung, Eun Hye Park, E Hwa Yun, Hye-Jin Kim, Hyun-Joo Kong, Chang Kyun Choi, Jeong-Soo Im, Hong Gwan Seo, The Community of Population-Based Regional Cancer Registries
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Epidemiol Health. 2023;45:e2023089. Published online October 12, 2023
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DOI: https://doi.org/10.4178/epih.e2023089
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 Abstract
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 PDF Supplementary Material
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Abstract
OBJECTIVES
This study investigated regional disparities in the incidence of 8 major cancers at the municipal level in Korea during 1999-2018 and evaluated the presence or absence of hot spots of cancer clusters during 2014-2018.
METHODS The Korea National Cancer Incidence Database was used. Age-standardized incidence rates were calculated by gender and region at the municipal level for 4 periods of 5 years and 8 cancer types. Regional disparities were calculated as both absolute and relative measures. The possibility of clusters was examined using global Moran’s I with a spatial weight matrix based on adjacency or distance.
RESULTS Regional disparities varied depending on cancer type and gender during the 20-year study period. For men, the regional disparities of stomach, colon and rectum, lung, and liver cancer declined, and those of thyroid and prostate cancer recently decreased, despite an overall increasing incidence. For women, regional disparities in stomach, colon and rectum, lung, liver, and cervical cancer declined, that of thyroid cancer recently decreased, despite an overall increasing incidence, and that of breast cancer steadily increased. In 2014-2018, breast cancer (I, 0.61; 95% confidence interval [CI], 0.53 to 0.70) showed a high probability of cancer clusters in women, and liver cancer (I, 0.48; 95% CI, 0.40 to 0.56) showed a high probability of cancer clusters in men.
CONCLUSIONS Disparities in cancer incidence that were not seen at the national level were discovered at the municipal level. These results could provide important directions for planning and implementing local cancer policies.
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Summary
Korean summary
이 연구는 한국 시군구 단위에서 지난 20년(1999-2018)간 주요 8개 암 발생률의 지역 간 격차를 조사하고, 최근 5년(2014-2018)의 암 발생 군집 가능성을 평가했습니다.
지역 간 격차는 여성에서 갑상선암, 남성에서는 폐암이 가장 큰 격차를 보였습니다. 군집 가능성은 여성의 경우 유방암, 남성의 경우 간암에서 가장 높았습니다.
전국 단위에서는 볼 수 없었던 지역 간 격차 및 군집 발생 가능성이 시군구 단위에서 발견되었고, 이러한 결과는 지역에 맞는 암 정책을 기획하고 실행하는 데 중요한 방향을 제시할 수 있을 것입니다.
Key Message
This study investigated regional disparities in the incidence of eight major cancers in Korea at the municipal level during 1999-2018 and assessed the possibility of cancer clusters during 2014-2018.
Thyroid cancer in women and lung cancer in men showed the most significant regional disparities. Breast cancer in women and liver cancer in men displayed the highest possibility of clustering.
Regional disparities and cancer clusters were identified locally, which were not detected nationally. These findings could provide valuable guidance for developing and implementing cancer policies that are tailored to local needs.
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Citations
Citations to this article as recorded by  - Hormone Replacement Therapy and Risks of Various Cancers in Postmenopausal Women with De Novo or a History of Endometriosis
Hee Joong Lee, Banghyun Lee, Hangseok Choi, Minkyung Lee, Kyungjin Lee, Tae Kyoung Lee, Sung Ook Hwang, Yong Beom Kim
Cancers.2024; 16(4): 809. CrossRef - What is the relationship between the local population change and cancer incidence in patients with dyslipidemia: Evidence of the impact of local extinction in Korea
Wonjeong Jeong, Dong‐Woo Choi, Woorim Kim, Kyu‐Tae Han
Cancer Medicine.2024;[Epub] CrossRef
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Effect of Pap smears on the long-term survival of cervical cancer patients: a nationwide population-based cohort study in Korea
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Xuan Quy Luu, Kyeongmin Lee, Jae Kwan Jun, Mina Suh, kyu-won Jung, Myong Cheol Lim, Kui Son Choi
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Epidemiol Health. 2022;44:e2022072. Published online September 7, 2022
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DOI: https://doi.org/10.4178/epih.e2022072
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5,247
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Abstract
Summary
PDFSupplementary Material
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Abstract
OBJECTIVES
This study aimed to investigate the effect of cervical cancer screening by Papanicolaou (Pap) smears on the long-term survival of cervical cancer patients.
METHODS We constructed a retrospective cohort of 14,903 women diagnosed with invasive cancer or carcinoma in situ in 2008 and 2009 and followed up until December 31, 2019, by using individual-level data from 3 national databases of the Korean National Cancer Screening Program, the Korean Central Cancer Registry, and death certificates. Cox proportional-hazards regression was used to investigate the effect of cervical cancer screening on mortality.
RESULTS In total, 12,987 out of 14,867 patients (87.4%) were alive at the end of the follow-up period (median: 10.5 years). Screened patients had a 38% lower risk of cervical cancer death than never-screened patients (hazard ratio [HR], 0.62; 95% confidence interval [CI], 0.54 to 0.70). Screening was associated with 59% and 35% lower risks of death, respectively, in screened patients with localized and regional stages. Furthermore, lower HRs among women who received screening were observed in all age groups, especially women aged 50–59 years (HR, 0.54; 95% CI, 0.42 to 0.69). The lowest HR for cervical cancer death was reported among patients screened within the past 2 years (HR, 0.54; 95% CI, 0.47 to 0.63), and the HRs increased with increasing time intervals.
CONCLUSIONS Pap smear screening significantly reduced the risk of cervical cancer-specific death in Korean women across all cancer stages.
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Summary
Korean summary
한국은 자궁경부암 발생과 사망을 낮추기 위하여 국가암검진사업으로 자궁경부암 검진을 실시하고 있다. 이 연구는 2008-2009년 자궁경부암 진단을 받은 30세-79세 14,903명을 대상으로 과거 자궁경부세포검진 여부에 따른 장기생존율을 추적 조사하였다. 그 결과 자궁경부암 검진을 받은 환자에서 사망 위험비가 약 38% 낮았으며, 2년 이내에 검진을 받은 환자군에서 사망 위험이 가장 낮았다.
Key Message
The Korean National Cancer Screening Program (KNCSP) has provided cervical cancer screening by Pap smear test. However, the survival, particularly long-term survival of cervical cancer patients, has never been evaluated in the KNCSP. This study reports a significant improvement in the long-term survival of screened cervical cancer patients, which persist in subgroup analysis by cancer stage. Patients who were screened within two years before the diagnosis had the best survival.
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Citations
Citations to this article as recorded by - The significance of uterine artery embolization in the treatment of utero‐cervical cancer: A single case report
Preeti Kumari Yadav, Abhimanyu Sharma, Muhammad Ali, Nida Khan, Jubran Al Balushi, Hajrah Farooq, Sree Abhilekha Purohit, Sofia Ali, Malavika Jayan, Archit Kumar Nigam, Mansi Singh
Clinical Case Reports.2024;[Epub] CrossRef
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Effect of mammography screening on the long-term survival of breast cancer patients: results from the National Cancer Screening Program in Korea
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Xuan Quy Luu, Kyeongmin Lee, Jae Kwan Jun, Mina Suh, Kyu-Won Jung, Kui Son Choi
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Epidemiol Health. 2022;44:e2022094. Published online October 26, 2022
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DOI: https://doi.org/10.4178/epih.e2022094
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5,083
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Abstract
PDFSupplementary Material
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Abstract
OBJECTIVES
This study investigated the effect of mammography screening on the long-term survival of breast cancer (BC) patients aged 40 years or older according to their screening history and duration since screening.
METHODS The study cohort was organized from 3 nationwide databases of the Korean National Cancer Screening Program, the Korean Central Cancer Registry, and death certificates. We included 24,387 women diagnosed with invasive BC or ductal carcinoma in situ in 2008 and 2009 and followed up until December 31, 2019. Cox proportional-hazards regression was used to investigate the effect of BC screening on the risk of death.
RESULTS Overall, 20,916 of 24,387 patients (85.8%) were alive at the end of the follow-up period (median: 10.5 years). The long-term survival rate was significantly lower in the never-screened group (80.3%) than in the screened group (88.9%) (p<0.001). A 35% reduction in the risk of BC death (hazard ratio [HR], 0.65; 95% confidence interval [CI], 0.60 to 0.70) from screening was observed. A subgroup analysis according to the cancer stage showed 62%, 36%, and 24% lower risks of BC death for the localized stage, regional stage, and distant stage, respectively. Women aged 40-49 years received the least benefit from BC screening (HR, 0.71; 95% CI, 0.62 to 0.81).
CONCLUSIONS Mammography screening was effective in reducing the risk of BC-specific death in Asian women across all cancer stages. However, this effect was relatively small among women in their 40s, suggesting that more detailed and specialized screening strategies are needed for that age group.
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Summary
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Citations
Citations to this article as recorded by - A Retrospective Analysis of Breast Cancer Mortality among Jewish and Muslim Arab Women in Israel: The Role of Sociodemographic Factors
Ronit Pinchas-Mizrachi, Dan Bouhnik
Cancers.2024; 16(15): 2763. CrossRef
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National Epidemiologic Survey of Thyroid cancer (NEST) in Korea
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Chang-Mo Oh, Hyun-Joo Kong, Eunyang Kim, Hyejin Kim, Kyu-Won Jung, Sohee Park, Young-Joo Won
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Epidemiol Health. 2018;40:e2018052. Published online October 26, 2018
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DOI: https://doi.org/10.4178/epih.e2018052
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14,830
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Abstract
The Korea Central Cancer Registry conducted the National Epidemiologic Survey of Thyroid cancer (NEST) to investigate changes in the epidemiological and clinical characteristics of thyroid cancer patients between 1999 and 2008. The NEST was designed to collect representative samples of patients with thyroid cancer diagnosed in the years 1999, 2005, and 2008 using a proportionally stratified and systematic random sampling method. Among 42,891 participants diagnosed with thyroid cancer, 5,796 participants were included in the final study population. This survey collected information on diagnostic methods and date, route of diagnosis, prior medical history and history of thyroid-related disease, tumor, lymph node, metastasis and collaborative stage, and treatment. The NEST dataset was also linked to the cause-of-death database from Statistics Korea. The mean age of the study participants was 46.9 years. The ratio of men to women was 1:5.5. In the analysis of the histologic type of cancer, the proportion of papillary thyroid carcinoma showed an increasing trend (p<0.01). In contrast, the proportion of distant metastasis and the mean tumor size of thyroid cancers showed decreasing trends over time (p<0.01, respectively).
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