Journal of Preventive Medicine and Public Health

Original Articles

Sleep Duration, Comorbidities, and Mortality in Korean Health Examinees: A Prospective Cohort Study: Sukhong Min, Woo-Kyoung Shin, Katherine De la Torre, Dan Huang, Hyung-Suk Yoon, Aesun Shin, Ji-Yeob Choi, Daehee Kang; J Prev Med Public Health. 2023;56(5):458-466. Published online September 26, 2023; DOI: https://doi.org/10.3961/jpmph.23.311

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Abstract Summary PDF Supplementary Material: Objectives
The association between long sleep duration and mortality is frequently attributed to the confounding influence of comorbidities. Nevertheless, past efforts to account for comorbidities have yielded inconsistent outcomes. The objective of this study was to evaluate this relationship using a large prospective cohort in Korea.
Methods
The study included 114 205 participants from the Health Examinees Study, who were followed for a median of 9.1 years. A composite comorbidity score was developed to summarize the effects of 21 diseases. Using Cox proportional hazards regression, hazard ratios (HRs) and 95% confidence intervals (CIs) for all-cause, cancer, and cardiovascular mortality associated with sleep duration were estimated. These estimates were adjusted for socio-demographic factors, lifestyle factors, body mass index, and comorbidity score. Additionally, a stratified analysis by subgroups with and without comorbidities was conducted.
Results
Throughout the follow-up period, 2675 deaths were recorded. After all adjustments, an association was observed between a sleep duration of 8 hours or more and all-cause mortality (HR, 1.10; 95% CI, 1.01 to 1.20). However, no such association was detected in the stratified analysis for the subgroups based on comorbidity status.
Conclusions
Long sleep duration was found to be associated with all-cause mortality among Koreans, even after adjusting for comorbidities. Additional studies are required to explore the mechanism underlying the association between sleep duration and major causes of mortality.; Summary

Korean summary
- 한국의 대규모 코호트 자료를 이용, 긴 수면 시간과 사망률 간의 연관성이 동반 상병으로 인한 교란 효과로 인한 것인지를 검토하였다. - 수면 시간과 총 사망률, 암 사망률, 심혈관질환 사망률 간의 연관성을 확인하였고, 이 중 총 사망률과 긴 수면 시간이 동반 상병 지수로 보정 한 뒤에도 유의한 연관성을 보였다.

Key Message
Using a large prospective cohort in Korea, the association between long sleep duration and mortality was evaluated, after adjusting for the confounding influence of comorbidities. When 114,205 participants from the Health Examinees Study were followed for a median of 9.1 years, sleep duration of 8 hours or more were found to be associated with all-cause mortality (HR, 1.10; 95% CI, 1.01 to 1.20). Additional studies are required to explore the mechanism underlying the association between sleep duration and major causes of mortality.

Operational Definitions of Colorectal Cancer in the Korean National Health Insurance Database: Hyeree Park, Yu Rim Kim, Yerin Pyun, Hyundeok Joo, Aesun Shin; J Prev Med Public Health. 2023;56(4):312-318. Published online May 31, 2023; DOI: https://doi.org/10.3961/jpmph.23.033

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Abstract Summary PDF Supplementary Material

Objectives
We reviewed the operational definitions of colorectal cancer (CRC) from studies using the Korean National Health Insurance Service (NHIS) and compared CRC incidence derived from the commonly used operational definitions in the literature with the statistics reported by the Korea Central Cancer Registry (KCCR).
Methods
We searched the MEDLINE and KoreaMed databases to identify studies containing operational definitions of CRC, published until January 15, 2021. All pertinent data concerning the study period, the utilized database, and the outcome variable were extracted. Within the NHIS-National Sample Cohort, age-standardized incidence rates (ASRs) of CRC were calculated for each operational definition found in the literature between 2005 and 2019. These rates were then compared with ASRs from the KCCR.
Results
From the 62 eligible studies, 9 operational definitions for CRC were identified. The most commonly used operational definition was “C18-C20” (n=20), followed by “C18-C20 with claim code for treatment” (n=3) and “C18-C20 with V193 (code for registered cancer patients’ payment deduction)” (n=3). The ASRs reported using these operational definitions were lower than the ASRs from KCCR, except for “C18-C20 used as the main diagnosis.” The smallest difference in ASRs was observed for “C18-C20,” followed by “C18- C20 with V193,” and “C18-C20 with claim code for hospitalization or code for treatment.”
Conclusions
In defining CRC patients utilizing the NHIS database, the ASR derived through the operational definition of “C18-C20 as the main diagnosis” was comparable to the ASR from the KCCR. Depending on the study hypothesis, operational definitions using treatment codes may be utilized.

Summary

Korean summary
- 국민건강보험공단 자료 기반 연구에서 사용된 대장암의 조작적 정의를 검토하고 각 조작적 정의에 따른 대장암의 연령표준화발생률을 중앙암등록본부에서 보고한 수치와 비교하였다. - 62개의 출판된 문헌을 검토하여 9개의 조작적 정의를 확인하였고 이 중 "C18-C20"이 가장 일반적으로 사용되었다. - "C18-C20"을 주진단으로 정의한 경우의 연령표준화발생률은 중앙암등록본부에서 보고한 연령표준화발생률과 가장 유사하였다.

Citations

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National Trends in Rotavirus Enteritis among Infants in South Korea, 2010–2021: A Nationwide Cohort
Hyun Jee Lee, Yujin Choi, Jaeyu Park, Yong-Sung Choi, Dong Keon Yon, Do Hyun Kim
Children.2023; 10(9): 1436. CrossRef
Real-world data analysis on effectiveness of integrative therapies: A practical guide to study design and data analysis using healthcare databases
Ye-Seul Lee, Yoon Jae Lee, In-Hyuk Ha
Integrative Medicine Research.2023; 12(4): 101000. CrossRef

The Korea Cohort Consortium: The Future of Pooling Cohort Studies: Sangjun Lee, Kwang-Pil Ko, Jung Eun Lee, Inah Kim, Sun Ha Jee, Aesun Shin, Sun-Seog Kweon, Min-Ho Shin, Sangmin Park, Seungho Ryu, Sun Young Yang, Seung Ho Choi, Jeongseon Kim, Sang-Wook Yi, Daehee Kang, Keun-Young Yoo, Sue K. Park; J Prev Med Public Health. 2022;55(5):464-474. Published online September 12, 2022; DOI: https://doi.org/10.3961/jpmph.22.299

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Abstract Summary PDF Supplementary Material

Objectives
We introduced the cohort studies included in the Korea Cohort Consortium (KCC), focusing on large-scale cohort studies established in Korea with a prolonged follow-up period. Moreover, we also provided projections of the follow-up and estimates of the sample size that would be necessary for big-data analyses based on pooling established cohort studies, including population-based genomic studies.
Methods
We mainly focused on the characteristics of individual cohort studies from the KCC. We developed “PROFAN”, a Shiny application for projecting the follow-up period to achieve a certain number of cases when pooling established cohort studies. As examples, we projected the follow-up periods for 5000 cases of gastric cancer, 2500 cases of prostate and breast cancer, and 500 cases of non-Hodgkin lymphoma. The sample sizes for sequencing-based analyses based on a 1:1 case-control study were also calculated.
Results
The KCC consisted of 8 individual cohort studies, of which 3 were community-based and 5 were health screening-based cohorts. The population-based cohort studies were mainly organized by Korean government agencies and research institutes. The projected follow-up period was at least 10 years to achieve 5000 cases based on a cohort of 0.5 million participants. The mean of the minimum to maximum sample sizes for performing sequencing analyses was 5917-72 102.
Conclusions
We propose an approach to establish a large-scale consortium based on the standardization and harmonization of existing cohort studies to obtain adequate statistical power with a sufficient sample size to analyze high-risk groups or rare cancer subtypes.

Summary

Korean summary
한국 코호트 컨소시엄(KCC)은 “2015년 한국의 생활 습관 및 환경 요인에 따른 암 기여분율” 프로젝트의 3단계 과업으로써, 본 프로젝트에 참여한 기존의 구축된 개인 코호트 연구의 연구자들을 주도로 다수의 대규모 한국 코호트 연구를 기반으로 구성되었다. 따라서 본 연구는 KCC에 포함된 한국 코호트 연구를 소개하는 것을 목표로 하였다. 또한 여러 기 확립된 국제 컨소시엄을 기반으로 빅데이터 기반 코호트 풀링 연구의 중요성을 제시하였다.

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The relationship between regional inequalities in the provision of emergency health services and other health services
Erkan Boğa
Medicine.2023; 102(45): e35930. CrossRef

Validity of Self-reported Stroke and Myocardial Infarction in Korea: The Health Examinees (HEXA) Study: Sunho Choe, Joonki Lee, Jeeyoo Lee, Daehee Kang, Jong-Koo Lee, Aesun Shin; J Prev Med Public Health. 2019;52(6):377-383. Published online November 12, 2019; DOI: https://doi.org/10.3961/jpmph.19.089

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Abstract PDF

Objectives
Self-reported disease history is often used in epidemiological studies. In this study, we acquired the hospital records of subjects who self-reported stroke or myocardial infarction (MI) and evaluated the validity of the participants’ self-reported disease history. We also determined the level of agreement between specialists and non-specialists.
Methods
Among the participants in the Health Examinees study, 1488 subjects self-reported stroke or MI during 2012-2017, and medical records were acquired for the 429 subjects (28.8%) who agreed to share their medical information. Each record was independently assigned to 2 medical doctors for review. The records were classified as ‘definite,’ ‘possible,’ or ‘not’ stroke or MI. If the doctors did not agree, a third doctor made the final decision. The positive predictive value (PPV) of self-reporting was calculated with the doctors’ review as the gold standard. Kappa statistics were used to compare the results between general doctors and neurologists or cardiologists.
Results
Medical records from 208 patients with self-reported stroke and 221 patients with self-reported MI were reviewed. The PPV of self-reported disease history was 51.4% for stroke and 32.6% for MI. If cases classified as ‘possible’ were counted as positive diagnoses, the PPV was 59.1% for stroke and 33.5% for MI. Kappa statistics showed moderate levels of agreement between specialists and non-specialists for both stroke and MI.
Conclusions
The validity of self-reported disease was lower than expected, especially in those who reported having been diagnosed with MI. Proper consideration is needed when using these self-reported data in further studies.

Summary

Citations

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Ana Quaresma, Elisabete Alves, Silvia Fraga, Ana Henriques
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Eva-Maria Hau, Tomáš Sláma, Stefan Essig, Gisela Michel, Laura Wengenroth, Eva Bergstraesser, Nicolas X. von der Weid, Christina Schindera, Claudia E. Kuehni
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Association of the amount of alcohol consumption with change in skeletal muscle and fat mass among Korean adults
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The Risk of Colorectal Cancer After Cholecystectomy or Appendectomy: A Population-based Cohort Study in Korea: Joonki Lee, Sunho Choe, Ji Won Park, Seung-Yong Jeong, Aesun Shin; J Prev Med Public Health. 2018;51(6):281-288. Published online October 29, 2018; DOI: https://doi.org/10.3961/jpmph.18.105

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Abstract Summary PDF Supplementary Material

Objectives
We investigated the association between cholecystectomy or appendectomy and the subsequent risk of colorectal cancer (CRC) in the Korean population.
Methods
A retrospective cohort study was conducted with the National Health Insurance Service–National Sample Cohort of Korea; this sample was followed up from January 1, 2002, until the date of CRC incidence, loss to follow-up, or December 31, 2015. The exposure status of cholecystectomy and appendectomy was treated as a time-varying covariate. The calculated risk of CRC was stratified by follow-up period, and the association between these surgical procedures and CRC was investigated by a Cox regression model applying appropriate lag periods.
Results
A total of 707 663 individuals were identified for analysis. The study population was followed up for an average of 13.66 years, and 4324 CRC cases were identified. The hazard ratio (HR) of CRC was elevated in the first year after cholecystectomy (HR, 1.71; 95% confidence interval [CI], 1.01 to 2.89) and in the first year and 2-3 years after appendectomy (HR, 4.22; 95% CI, 2.87 to 6.20; HR, 2.34; 95% CI, 1.36 to 4.03, respectively). The HRs of CRC after applying 1 year of lag after cholecystectomy and 3 years of lag after appendectomy were 0.80 (95% CI, 0.57 to 1.13) and 0.77 (95% CI, 0.51 to 1.16), respectively.
Conclusions
The risk of CRC increased in the first year after cholecystectomy and appendectomy, implying the possibility of bias. When appropriate lag periods after surgery were applied, no association was found between cholecystectomy or appendectomy and CRC.

Summary

Korean summary
본 연구는 담낭절제술, 충수돌기절제술 후 대장암의 발생위험에 관한 연구로 국민건강보험공단 표본코호트자료를 사용한 후향적코호트 연구이다. 총 707 663명을 대상으로 연구를 진행하였으며, 담낭절제술을 시행한 환자들은 수술 후 1년 이내에서 대장암의 위험도가 유의하게 증가하였으나 이후 관련성을 보이지 않았고, 충수돌기절제술을 시행한 환자들은 수술 후 1년, 2~3년에서 유의하게 위험도가 증가하였으나, 이후에는 관련성을 보이지 않았다. 이 결과는 역인과관계의 가능성을 시사하며 이것을 고려하였을 때, 담낭절제술과 충수돌기절제술은 대장암의 발생위험과의 연관성을 보이지 않았다.

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Cellular and Molecular Gastroenterology and Hepatology.2023; 15(3): 665. CrossRef
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Mei Sze Lee, Alben Thomas, John F. Pearson, Rachel Purcell, Francis Frizelle, Tamara Glyn
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Zhuhui Liu, Xinyue Ma, Chunqi Zhu, Jing‐Yuan Fang
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Zhenyu Dong, Ruixian Shi, Pengda Li, Xiaobiao Song, Fan Dong, Jianmin Zhu, Riga Wu, Zhi Liang, Mingyue Du, Jijun Wang, Zhigang Yang
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No association between cholecystectomy and risk of colorectal cancer: a meta-analysis of cohort studies
Lulin Yu, Wenjing Liu, Yici Yan, Yu Jiang, Xin Gao, Shanming Ruan
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Operational Definitions of Colorectal Cancer in the Korean National Health Insurance Database
Hyeree Park, Yu Rim Kim, Yerin Pyun, Hyundeok Joo, Aesun Shin
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Colorectal cancer risk following appendectomy: a pooled analysis of three large prospective cohort studies
Joseph A. Rothwell, Nagisa Mori, Fanny Artaud, Agnès Fournier, Marco Conte, Marie‐Christine Boutron‐Ruault, Simon S. M. Chan, Marc J. Gunter, Neil Murphy, Gianluca Severi
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A.L. van den Boom, B.D.A. Lavrijssen, J. Fest, M.A. Ikram, B.H. Stricker, C.H.J. van Eijck, R. Ruiter
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Szabolcs Ábrahám, Tibor Németh, Ria Benkő, Mária Matuz, Aurél Ottlakán, Dániel Váczi, Attila Paszt, Zsolt Simonka, György Lázár
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Doeun Jang, Sunho Choe, Ji Won Park, Seung‐Yong Jeong, Aesun Shin
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Diabetes Mellitus and Site-specific Colorectal Cancer Risk in Korea: A Case-control Study: Hyeongtaek Woo, Jeeyoo Lee, Jeonghee Lee, Ji Won Park, Sungchan Park, Jeongseon Kim, Jae Hwan Oh, Aesun Shin; J Prev Med Public Health. 2016;49(1):45-52. Published online December 22, 2015; DOI: https://doi.org/10.3961/jpmph.15.029

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Abstract PDF

Objectives
Previous large-scale cohort studies conducted in Korea have found a positive association between diabetes mellitus (DM) and colorectal cancer (CRC) in men only, in contrast to studies of other populations that have found significant associations in both men and women.
Methods
A total of 1070 CRC cases and 2775 controls were recruited from the National Cancer Center, Korea between August 2010 and June 2013. Self-reported DM history and the duration of DM were compared between cases and controls. Odds ratios (ORs) and 95% confidence intervals (CIs) were calculated by binary and polytomous logistic regression models.
Results
DM was associated with an elevated risk of CRC in both men (OR, 1.47; 95% CI, 1.13 to 1.90) and women (OR, 1.92; 95% CI, 1.24 to 2.98). This association remained when we controlled for age, body mass index, alcohol consumption, and physical activity level. In sub-site analyses, DM was associated with distal colon cancer risk in both men (multivariate OR, 2.04; 95% CI, 1.39 to 3.00) and women (multivariate ORs, 1.99; 95% CI, 1.05 to 3.79), while DM was only associated with rectal cancer risk in women (multivariate OR, 2.05; 95% CI, 1.10 to 3.82). No significant association was found between DM and proximal colon cancer risk in either men (multivariate OR, 1.45; 95% CI, 0.88 to 2.41) or women (multivariate OR, 1.79; 95% CI, 0.78 to 4.08).
Conclusions
Overall, DM was associated with an increased risk of CRC in Koreans. However, potential over-estimation of the ORs should be considered due to potential biases from the case-control design.

Summary

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Mirabella Zhao, Donghua Liao, Jingbo Zhao
World Journal of Diabetes.2017; 8(6): 249. CrossRef

Alcohol Consumption and Mortality in the Korean Multi-center Cancer Cohort Study: En-Joo Jung, Aesun Shin, Sue K. Park, Seung-Hyun Ma, In-Seong Cho, Boyoung Park, Eun-Ha Lee, Soung-Hoon Chang, Hai-Rim Shin, Daehee Kang, Keun-Young Yoo; J Prev Med Public Health. 2012;45(5):301-308. Published online September 28, 2012; DOI: https://doi.org/10.3961/jpmph.2012.45.5.301

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Abstract PDF

Objectives

To examine the association between alcohol consumption habit, types of beverages, alcohol consumption quantity, and overall and cancer-specific mortality among Korean adults.

Methods

The alcohol consumption information of a total of 16 320 participants who were 20 years or older from the Korean Multi-center Cancer Cohort were analyzed to examine the association between alcohol consumption habit and mortality (median follow-up of 9.3 years). The Cox proportional hazard model was used to estimate the hazard ratio (HR) of alcohol consumption to mortality adjusting for age, sex, geographic areas, education, smoking status, and body mass index.

Results

Alcohol drinkers showed an increased risk for total mortality compared with never drinkers (HR, 1.72; 95% confidence interval [CI], 1.38 to 2.14 for past drinkers; HR, 1.21; 95% CI, 1.06 to 1.39 for current drinkers), while past drinkers only were associated with higher risk for cancer deaths (HR, 1.84; 95% CI, 1.34 to 2.53). The quantity of alcohol consumed per week showed a J-shaped association with risk of mortality. Relative to light drinkers (0.01 to 90 g/wk), never drinkers and heavy drinkers (>504 g/wk) had an increased risk for all-cause and cancer deaths: (HR, 1.18; 95% CI, 0.96 to 1.45) and (HR, 1.39; 95% CI, 1.05 to 1.83) for all-cause mortality; and (HR, 1.55; 95% CI, 1.15 to 2.11) and (HR, 2.07; 95% CI, 1.39 to 3.09) for all cancer mortality, respectively. Heavy drinkers (>504 g/wk) showed an elevated risk for death from stomach and liver cancers.

Conclusions

The present study supports the existence of a J-shaped association between alcohol consumption quantity and the risk of all-cause and cancer deaths. Heavy drinkers had an increased risk of death from cancer overall and liver and stomach cancer.

Summary

Citations

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Multicenter Studys

Cigarette Smoking and Gastric Cancer Risk in a Community-based Cohort Study in Korea.: Yeonju Kim, Aesun Shin, Jin Gwack, Jae Kwan Jun, Sue Kyung Park, Daehee Kang, Hai Rim Shin, Soung Hoon Chang, Keun Young Yoo; J Prev Med Public Health. 2007;40(6):467-474.; DOI: https://doi.org/10.3961/jpmph.2007.40.6.467

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Abstract PDF

OBJECTIVES
Gastric cancer is the most common incident cancer in Korea. Although Helicobacter pylori infection is the most important risk factor for the development of gastric cancer, cigarette smoking has also been suggested to play an important role in the development of gastric cancer. The objective of this study is to evaluate the relationship between cigarette smoking and gastric cancer risk in a Korean population. METHODS: The study population consisted of 13,785 subjects who had been enrolled in the Korean Multi-Center Cancer Cohort between 1993 and 2002. As of December 2002, 139 incident gastric cancer cases were ascertained through the Korea Central Cancer Registry and the National Death Certificate Database. Relative risks (RR) and 95% confidence intervals (CI) for gastric cancer were estimated using CoxZs proportional hazard model adjusted for age, education, alcohol drinking status and history of gastritis or ulcer. RESULTS: Significant dose-response relationships were observed between the duration of smoking and the risk of gastric cancer among the male subjects in comparison to non-smokers: men who smoked for 20-39 years had a 2.09- fold (95% CI 1.00-4.38) increase, and those who smoked for more than 40 years had a 3.13-fold (95% CI 1.59-6.17) increase in the risk of gastric cancer (Ptrend<0.01). CONCLUSIONS: This study suggests that a longer duration of cigarette smoking may increase the risk of gastric cancer development in a dose-response manner in Korean men. The association between smoking and gastric cancer risk in women should be verified in future studies with a larger number of cases.

Summary

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European Journal of Cancer Prevention.2018; 27(2): 124. CrossRef
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Amartya Roy, Jyotirmoy Sikdar, Paromita Seal, Rajen Haldar
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Associations of lifestyle‐related factors, hsa‐miR‐149 and hsa‐miR‐605 gene polymorphisms with gastrointestinal cancer risk
Zhang MW, Jin MJ, Yu YX, Zhang SC, Liu B, Jiang X, Pan YF, Li QL, Ma XY, Chen K
Molecular Carcinogenesis.2012;[Epub] CrossRef
Gastric Cancer Epidemiology in Korea
Aesun Shin, Jeongseon Kim, Sohee Park
Journal of Gastric Cancer.2011; 11(3): 135. CrossRef
Effect of chronic smoking on lipid peroxidation and antioxidant status in gastric carcinoma patients
Palanisamy Pasupathi, Ganesan Saravanan, Palanisamy Chinnaswamy, Govindaswamy Bakthavathsalam
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The role of TNFgenetic variants and the interaction with cigarette smoking for gastric cancer risk: a nested case-control study
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Assessment of DNA Viability in Long Term-Stored Buffy Coat Species for the Korean Multicenter Cancer Cohort.: Mihi Yang, Jihyun Yoo, Cheong Sik Kim, Aesun Shin, Daehee Kang, Soung Hoon Chang, Sue Kyung Park, Hai Rim Shin, Keun Young Yoo; Korean J Prev Med. 2003;36(4):373-376.

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Abstract PDF: OBJECTIVES
Peripheral blood-buffy coat fractions (N = 14, 956) have been stored at -70degrees C in the headquarter of the Korean Multicenter Cancer Cohort (KMCC), since 1993. To study the future molecular etiology of cancers using specimens of the cohort, properly stored specimens are necessary. Therefore, the DNA-viability of the buffy coat samples was investigated. METHODS: Buffy coat fraction samples were randomly selected from various collection areas and years (N = 100). The DNA viability was evaluate from the UV-absorbent ratios at 260/280nm and the PCR for beta-globin was performed with genomic DNA isolated from the buffy coat. RESULTS: PCR products were obtained from 85 and 98% of the C and H area-samples, respectively, using 50 or 100mul of the buffy coat. There were significant differences in the yields of the PCR-amplifications from the C and H areas (p < 0.05), which was due to differences in the homogenization of the buffy coat fractions available as aliquots. The PCR-products were obtained from all of the samples (N = 7) stored at the C area-local center, but the other aliquots stored at the headquarter were not PCR-amplified. Therefore, the PCR products in almost all the samples, even including the DNA-degraded samples, were obtained. In addition, an improvement in the DNA isolation, i.e. approx. 1.6 fold, was found after using extra RBC lysis buffer. CONCLUSIONS: PCR products for beta-globin were obtained from nearly all of the samples. The regional differences in the PCR amplifications were thought to have originated from the different sample-preparation and homogenization performance. Therefore, the long term-stored buffy coat species at the KMCC can be used for future molecular studies.; Summary

Original Articles

Estimation of Joint Risks for Developing Uterine Cervix Cancer in Korea.: Hachung Yoon, Aesun Shin, Sue Kyung Park, Myung Jin Jang, Keun Young Yoo; Korean J Prev Med. 2002;35(3):263-268.

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Abstract PDF: OBJECTIVE
This study was aiming at estimating the joint effects of various risk factors associated with uterine cervix cancer in Korea. METHODS: Data obtained from a case-control study were analyzed with a multiplicative model. RESULTS: After adjustment for age and husband's educational attainments, the family history of cervical cancer (OR=2.1, 95% CI=1.2-3.9), unstable marital status due to separation, by death or divorce, etc. (OR=2.8, 95% CI=1.7-4.6), and a large number of deliveries (> or = 3 vs. nulliparous OR=6.5, 95% CI=1.4-29.9) increased the risk of uterine cervix cancer. Conversely, first sexual intercourse at an older age (> or = 25 years vs. <19 years OR=0.4, 95% CI=0.2-0.6) and husband's circumcision (OR=0.7, 95% CI=0.5-1.0) decreased the risk. In the multiplicative model, the highest joint risk (OR=39.2, 95% CI 5.9-258.9) was observed in women with a family history of uterine cervical cancer, an unstable marital status, where the ex-husband was not circumcised, with 3 or more delivery experiences, and having her first sexual intercourse when younger than 19 years of age. However, women without a family history of uterine cervix cancer, married to a circumcised husband, having had her first sexual intercourse at 25 years or older, and nulliparous, showed the lowest joint effect (OR=0.3, 95% CI=0.1-0.5). CONCLUSION: As carcinogenesis is a complex action involving various factors, we consider a joint effects approach to be appropriate in an epidemiological study on risk factors for uterine cervix neoplasms.cervix neoplasm.; Summary

A Case-Control Study on the Relationship between Obesity and Female Colorectal Cancer.: Aesun Shin, Hachung Yoon, Keun Young Yoo; Korean J Prev Med. 2002;35(2):147-152.

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Abstract PDF: OBJECTIVES
A hospital-based case-control study was conducted to evaluate the role of obesity in the development of colorectal cancer. METHODS: Three hundred and twenty four histologically confirmed female colorectal cancer cases and 26,998 non-cancer controls were selected from patients invited to the Aichi Cancer Center, Nagoya, Japan between 1989 and 1995. Information concerning demographic factors, medical history, family medical history, reproductive factors and dietary factors were obtained from self-administered questionnaires and medical records. The effects of weight and body mass index to colorectal cancer were examined using multiple logistic regression to control for other risk factors. RESULTS: There was no significant association between female colorectal cancer and obesity. Heavier weight adjusted for height or body mass index did not increase the risk of colorectal cancer. CONCLUSIONS: These results suggest that there is no associa-tion between colorectal cancer risk and obesity in women.; Summary

English Abstract

Fasting Serum Glucose Level and Gastric Cancer Risk in a Nested Case-control Study.: Jae Kwan Jun, Jin Gwack, Sue Kyung Park, Yun Hee Choi, Yeonju Kim, Aesun Shin, Soung Hoon Chang, Hai Rim Shin, Keun Young Yoo; J Prev Med Public Health. 2006;39(6):493-498.

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Abstract PDF: OBJECTIVES
Diabetes has been reported as a risk factor for several cancers. However, the association between diabetes and gastric cancer has been inconsistent. The aim of this study was to evaluate the association between the fasting serum glucose level and gastric cancer risk in Korea. METHODS: Among the members of the Korean Multi-Center Cancer Cohort (KMCC) from 1993 to 2004, a total of 100 incident gastric cancer cases were ascertained until December 31, 2002 and 400 controls were matched according to age, sex, and year and area of enrollment. Of the eligible subjects, those without fasting serum glucose level information were excluded, with a total of 64 cases and 236 controls finally selected. On enrollment, all subjects completed a baseline demographic and lifestyle characteristics questionnaire, and had their fasting serum glucose level measured. The Helicobacter pylori infection status was determined by an immunoblot assay using longterm stored serum. The odds ratios (ORs) were estimated using conditional and unconditional logistic regression models adjusted for the H. pylori infection status, smoking, drinking, education, follow-up period and matching variables. RESULTS: The ORs for risk of gastric cancer according to the serum glucose level were 1.33 [95% CI=0.50-3.53] and 1.66 [95% CI=0.55-5.02] for the categories of 100-125 and 126 mg/dL or greater, respectively, compared to the category of less than 100 mg/dL. No increased risk of gastric cancer according to the serum glucose level was found (p-trend=0.337). CONCLUSIONS: This study provides no evidence for an association of the serum glucose level with gastric cancer.; Summary

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