Epidemiology and Health

Original Article

Fraction of cancer incidence and mortality attributable to dietary factors in Korea from 2015 to 2030: Hyun Jeong Cho, Jin Young Yoo, Ga-Eun Yie, An Na Kim, Soseul Sung, Sungji Moon, Youjin Hong, Sangjun Lee, Inah Kim, Kwang-Pil Ko, Sun-Seog Kweon, Jung Eun Lee, Sue K. Park; Epidemiol Health. 2025;47:e2025065. Published online December 8, 2025; DOI: https://doi.org/10.4178/epih.e2025065

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Abstract Summary PDF: Abstract
OBJECTIVES
Dietary factors play an important role in modifying cancer risk. This study aimed to assess the proportion of cancer incidence and mortality in Korea attributable to dietary factors from 2015 to 2030.
METHODS
We estimated the population-attributable fraction (PAF) of cancer incidence and mortality using dietary intake levels, exposure rates, and relative risks (RRs). Intake and exposure rates were derived from the Korean National Health and Nutrition Examination Survey, assuming a 15-year latency. RRs were obtained from meta-analyses of Korean cohort and case- control studies.
RESULTS
In 2020, 6.08% of cancer cases and 5.70% of deaths in Korea were attributable to dietary factors. High salted vegetable intake (2.12% for incidence and 1.78% for deaths) and low intake of non-starchy vegetables and fruits (1.92 and 2.34%, respectively) were major contributors. However, high intakes of red meat and processed meat showed low PAFs, each less than 1%. The projected PAF for cancer attributable to high salted vegetable intake is expected to decrease substantially to 1.17% in 2030. In contrast, the PAF linked to low intake of non-starchy vegetables and fruits is projected to remain relatively stable.
CONCLUSIONS
Our findings provide evidence that dietary factors make a substantial contribution to cancer incidence and mortality in Korea. This study highlights that reducing salted vegetable intake and encouraging a diet rich in non-starchy vegetables and fruits may support cancer prevention efforts. Continuous monitoring of dietary trends remains crucial for reducing the cancer burden.; Summary

Korean summary
2020년 기준으로 식이 요인은 암 발생과 사망의 일정 비율을 차지하였으며, 여러 식이 요인 중에서는 염장채소의 높은 섭취와 비전분 채소 및 과일의 낮은 섭취가 상대적으로 높은 기여를 보였다. 이러한 결과는 식이 요인별 암 부담의 차이를 이해하고, 향후 식이 섭취 양상에 대한 지속적인 관찰과 공중보건적 검토의 필요성을 시사한다.

Key Message
In 2020, dietary factors accounted for a proportion of the cancer burden, with high intake of salted vegetables and low intake of non-starchy vegetables and fruits showing the largest contributions among dietary factors examined. These findings suggest the need for continued assessment of dietary patterns and their potential relevance in public health discussions on cancer prevention.

Systematic Review

Association between gallstones and the risk of biliary tract cancer: a systematic review and meta-analysis: Dan Huang, Hyundeok Joo, Nan Song, Sooyoung Cho, Woosung Kim, Aesun Shin; Epidemiol Health. 2021;43:e2021011. Published online February 3, 2021; DOI: https://doi.org/10.4178/epih.e2021011

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44 Crossref

Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Biliary tract cancers (BTCs) are rare but highly fatal. Although the etiology of BTC is poorly understood, gallstones are proposed to be a major risk factor. We conducted a systematic review and meta-analysis to examine the associations between gallstone characteristics and BTC risk.

METHODS

We searched the MEDLINE, Embase, and Cochrane Central databases and systematically reviewed cohort and case-control studies published before April 9, 2018. All the included studies reported appropriate risk estimates and confidence intervals (CIs) for associations between the presence, size, number, or duration of gallstones and the risk of BTC, including gallbladder cancer (GBC), extrahepatic bile duct cancer (EBDC), and ampulla of Vater cancer (AOVC). Summary odds ratios (ORs) and their 95% CIs were calculated using a random-effects model in the meta-analysis. Subgroup analyses were conducted to inspect sources of potential heterogeneity, and the Egger test was performed to assess publication bias.

RESULTS

Seven cohort studies and 23 case-control studies in Asian, European, and American populations were included. The presence of gallstones was associated with an increased risk of BTC (OR, 4.38; 95% CI, 3.23 to 5.93; I<sup>2</sup>=91.2%), GBC (OR, 7.26; 95% CI, 4.33 to 12.18), EBDC (OR, 3.17; 95% CI, 2.24 to 4.50), and AOVC (OR, 3.28; 95% CI, 1.33 to 8.11). Gallstone size (>1 vs. <1 cm; OR, 1.88; 95% CI, 1.10 to 3.22) was significantly associated with the risk of GBC.

CONCLUSIONS

Gallstone characteristics, such as presence, size, and number, are associated with an increased risk of BTC. However, significantly high heterogeneity in the meta-analyses is a limitation of this study.

Summary

Korean summary
The prevalence of APCT-detected sacroiliitis in CD patients was higher than that in controls, but the condition was asymptomatic. The clinical significance of asymptomatic sacroiliitis in Korean CD patients remains unclear.

Key Message
본 연구에서는 체계적 문헌고찰과 메타분석법을 활용하여 여러 선행연구에서 담도계암 전반과 담석의 다양한 특성사이에 연관성이 있는지 탐구하였다. 총 30개의 문헌을 분석한 결과 담석의 존재 여부가 담도계암과 각 하위 암의 위험을 모두 높이는 것으로 나타났고, 담석의 크기가 클수록 담낭암의 위험이 높은 것으로 드러났다. 본 연구는 담석과 담도계암 전반의 연관성에 대해 체계적으로 정리한 최초의 문헌으로서 담석과 담도계암의 관계에 대한 이해의 폭을 넓히고, 추후 해당 주제로 추가 연구를 수행하는 데에 있어 기준점이 될 수 있으리라 기대한다.

Citations

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Review

Meta-analysis of the prevalence of depression among breast cancer survivors in Iran: an urgent need for community supportive care programs: Hassan Ahmadi Gharaei, Mostafa Dianatinasab, Seyyed Mostafa Kouhestani, Mohammad Fararouei, Hossein Moameri, Reza Pakzad, Reza Ghaiasvand; Epidemiol Health. 2019;41:e2019030. Published online July 4, 2019; DOI: https://doi.org/10.4178/epih.e2019030

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308 Download
18 Web of Science
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Abstract PDF Supplementary Material

Abstract

OBJECTIVES
Depression, which is the most common comorbidity in breast cancer (BC) patients, has adverse effects on patients’ quality of life, disease progress, and survival.

METHODS

The protocol of this study was registered in PROSPERO (registration No. CRD42019121494). We electronically searched published studies through January 2019 with the aim of finding articles that investigated the prevalence of depression among BC survivors. Web of Science, Scopus, PubMed/MEDLINE, Science Direct, and Google Scholar were searched to obtain relevant published studies. This review included 14 cross-sectional and 4 cohort studies published from 2000 to 2018. We used a random-effects model to conduct the meta-analysis and generated a summary estimate for the pooled prevalence with 95% confidence intervals (CIs). A subgroup analysis was also conducted based on the depression assessment tool used and the study design.

RESULTS

The total sample size of the studies contained 2,799 women with BC, including 1,228 women who were diagnosed with depression. The pooled prevalence of depression among Iranian women with BC was 46.83% (95% CI, 33.77 to 59.88) with significant heterogeneity (I2 =98.5%; p<0.001). The prevalence of depression ranged from 14.00% (95% CI, 4.91 to 23.09) to 95.90% (95% CI, 91.97 to 99.83). The results of the subgroup analyses suggested that the depression assessment tool, year of publication, and study design were sources of heterogeneity.

CONCLUSIONS

Our findings indicate a high prevalence of depression among BC patients, underscoring the urgent need for clinicians and health authorities to provide well-defined social and psychological supportive care programs for these patients.

Summary

Citations

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Original Articles

Intestinal obstruction: predictor of poor prognosis in colorectal carcinoma?: Mohd Azri Mohd Suan, Wei Leong Tan, Shahrul Aiman Soelar, Ibtisam Ismail, Muhammad Radzi Abu Hassan; Epidemiol Health. 2015;37:e2015017. Published online March 30, 2015; DOI: https://doi.org/10.4178/epih/e2015017

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Abstract PDF

Abstract

OBJECTIVES
The goal of this study was to assess the relationship between intestinal obstruction and the prognosis of colorectal carcinoma.

METHODS

Data pertaining to 4,501 colorectal carcinoma patients were extracted from the national colorectal registry and analysed. Survival analysis was performed using the Kaplan-Meier method. The log-rank test was used to compare the survival rate between patients with intestinal obstruction and those without intestinal obstruction. The p-values<0.05 were considered to indicate statistical significance. Simple Cox proportional hazards regression analysis was used to estimate the crude hazard ratio of mortality from colorectal cancer.

RESULTS

Intestinal obstruction was reported in more than 13% of patients. The 3-year survival rate after treatment was 48.3% (95% confidence interval [CI], 43.9 to 52.8) for patients with intestinal obstruction (n=593) and 54.9% (95% CI, 53.1 to 56.6) for patients without intestinal obstruction (n=3,908). The 5-year survival rate for patients with intestinal obstruction was 37.3% (95% CI, 31.9 to 42.8), which was lower than that of patients without intestinal obstruction (45.6%; 95% CI, 43.5 to 47.7). After adjusting the hazard ratio for other prognostic variables, intestinal obstruction had a statistically significant negative correlation with the survival rate of colorectal cancer patients, with an adjusted hazard ratio of 1.22 (p=0.008).

CONCLUSIONS

The presence of intestinal obstruction is associated with a lower survival rate among colorectal cancer patients.

Summary

Citations

Citations to this article as recorded by

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Epidemiological Comparison of viral hepatitis-hepatocellular carcinoma(HCC) and non viral hepatitis-hepatocellular carcinoma(HCC).: Pae Gun Park, Song Gyu Yoon, Hee Sup Lee, Jin Kun Jang, Ju Hee Maeng, Gee Hyun Lee, Jong Soo Choi; Korean J Epidemiol. 2003;25(1):32-38.

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Abstract PDF: Abstract
BACKGROUND
Korea is one of high incidence areas of Hepatocellular carcinoma (HCC) and major etiologic factor is hepatitis B virus (HBV). In future incidence of HBV related HCC may decrease and non viral hepatitis HCC (Non-B,C HCC) relatively increase because of widely used vaccination for HBV. To evaluate epidemiological characters of Non-B,C HCC, We divided HCC by viral or non-viral feature and compared each others.
METHODS
185 patients firstly diagnosed HCC and 455 normal subjects included from January 1997 to December 2000 and divided into 3 groups, HBV group (positive HBsAg), HCV group (positive anti-HCV Ab) and Non-B,C group (both negative HBsAg and anti-HCV Ab).
RESULTS
136 cases were HBV group (73.5%), 19 cases were HCV group (10.3%) and 27 cases were Non-B,C group (14.6%). Mean age of Non-B,C group at diagnosis was higher than HBV group (64.1+/-7.1 vs 55.6+/-7.7). Non-B,C HCC were more associated with alcohol abuse and rural residence (p<0.01). There was no difference of family history of liver disease, coexistence rate of liver cirrhosis and occupation.
CONCLUSION
Non-B,C HCC tended to be older in mean age than HBV HCC and more associated with alcohol abuse and rural residence. This characteristics of Non-B,C HCC supposed to be from difference in alcohol consumption and environment.; Summary

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