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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 - Epidemiol Health. 2022;44:e2022094. Published online October 26, 2022
- DOI: https://doi.org/10.4178/epih.e2022094
- 2,099 View
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AbstractOBJECTIVES
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.METHODSThe 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.RESULTSOverall, 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).CONCLUSIONSMammography 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. -
Summary
- 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
- Epidemiol Health. 2022;44:e2022072. Published online September 7, 2022
- DOI: https://doi.org/10.4178/epih.e2022072
- 1,871 View
- 85 Download
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Abstract
Summary
PDFSupplementary Material
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AbstractOBJECTIVES
This study aimed to investigate the effect of cervical cancer screening by Papanicolaou (Pap) smears on the long-term survival of cervical cancer patients.METHODSWe 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.RESULTSIn 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.CONCLUSIONSPap smear screening significantly reduced the risk of cervical cancer-specific death in Korean women across all cancer stages. -
SummaryKorean 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.
Data Profile- 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
- Epidemiol Health. 2018;40:e2018052. Published online October 26, 2018
- DOI: https://doi.org/10.4178/epih.e2018052
- 10,685 View
- 250 Download
- 21 Citations
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AbstractThe 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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Citations
Citations to this article as recorded by
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