Epidemiology and Health

Original Articles

Interaction between vitamin E intake and a COMT gene variant on colorectal cancer risk among Korean adults: a case-control study: Shinyoung Jun, Madhawa Gunathilake, Jeonghee Lee, Jae Hwan Oh, Hee Jin Chang, Dae Kyung Sohn, Aesun Shin, Jeongseon Kim; Epidemiol Health. 2023;45:e2023100. Published online November 14, 2023; DOI: https://doi.org/10.4178/epih.e2023100

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Abstract Summary PDF Supplementary Material: Abstract
OBJECTIVES
Previous human trials have not supported the anticarcinogenic effect of vitamin E despite biological plausibility and considerable epidemiological evidence. A possible explanation for this inconsistency is the interactive effect of the catechol-O-methyltransferase (COMT) gene and supplemental vitamin E on cancer. We examined whether a COMT gene variant modulates the effect of dietary vitamin E intake on colorectal cancer (CRC) risk.
METHODS
In this case-control study of Korean adults (975 cases and 975 age- and sex-matched controls), dietary vitamin E density (mg/1,000 kcal) was measured using a semiquantitative food frequency questionnaire, COMT single nucleotide polymorphism (SNP) rs740603 (A>G) was genotyped, and CRC was verified histologically. We estimated odds ratios (ORs) and 95% confidence intervals (CIs) using unconditional logistic regression models with adjustments for potential confounders.
RESULTS
Higher vitamin E density was associated with a lower risk of CRC (highest vs. lowest quartiles: OR, 0.72; 95% CI, 0.55 to 0.96; p-for-trend=0.002). When stratified by COMT SNP rs740603 genotype, the inverse association between vitamin E density and CRC risk was confined to those with at least 1 A allele (≥median vs. <median: OR, 0.63; 95% CI, 0.51 to 0.78). The interaction between rs740603 and vitamin E density was significant (p-for-interaction=0.020). No direct association was observed between COMT SNP rs740603 and CRC risk (OR, 1.08; 95% CI, 0.83 to 1.41).
CONCLUSIONS
Our findings support a role for a genetic polymorphism in COMT in modifying the association between dietary vitamin E intake and CRC.; Summary

Korean summary
본 연구는 국립암센터에서 수집한 대장암 환자-대조군 자료를 활용하여, catechol-O-methyltransferase (COMT) 유전자의 단일염기다형성(SNP)에 따라 비타민 E 섭취와 대장암 위험 간의 연관성이 달라지는지 파악하고자 하였다. 분석 결과, COMT SNP rs740603의 유전자형에 따라 식이를 통한 비타민 E 섭취 밀도와 대장암 위험 간의 연관성이 다르게 나타나 COMT 유전자와 비타민 E 섭취 간의 상호작용이 대장암 발생 위험에 영향을 미칠 가능성이 있음을 제시하였다.

Key Message
In this case-control study of Korean adults, we examined whether a polymorphism in the catechol-O-methyltransferase (COMT) gene modulates the effect of dietary vitamin E intake on colorectal cancer risk. Our results suggest that the inverse association between vitamin E density and colorectal cancer risk is confined to carriers of the COMT rs740603 A allele. The findings of our study support the interactive effect of the COMT gene and vitamin E intake on colorectal cancer risk.

Socioeconomic inequality in organized and opportunistic screening for colorectal cancer: results from the Korean National Cancer Screening Survey, 2009-2021: Xuan Quy Luu, Kyeongmin Lee, Jae Kwan Jun, Mina Suh, Kui Son Choi; Epidemiol Health. 2023;45:e2023086. Published online September 17, 2023; DOI: https://doi.org/10.4178/epih.e2023086

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
This study aimed to investigate socioeconomic status (SES)-based inequality in colorectal cancer (CRC) screening in Korea. We assessed whether the rates of opportunistic and organized CRC screening differed according to income and education levels.

METHODS

We analyzed data from the Korean National Cancer Screening Survey of 27,654 cancer-free individuals, aged 50-74 years, from 2009 to 2021. The weighted cancer screening rates with trends were estimated with the average annual percentage change using joinpoint regression. Inequality was calculated in both relative and absolute terms, based on a Poisson regression model.

RESULTS

The organized screening rate increased significantly from 22.1% in 2009 to 53.1% in 2020 and 50.6% in 2021, with an average annual change of 8.6% (95% confidence interval [CI], 4.9 to 12.5). In contrast, no significant trend was observed for opportunistic screening. The SES inequality in opportunistic screening uptake was indicated by a slope index of inequality (SII) of 9.74% (95% CI, 6.36 to 13.12), relative index of inequality (RII) of 2.18 (95% CI, 1.75 to 2.70) in terms of education level; and an SII of 7.03% (95% CI, 4.09 to 9.98), RII of 1.81 (95% CI, 1.41 to 2.31) in terms of measured income. Although there was an increasing trend in income inequality, no significant SES inequalities were observed in the overall estimates for organized screening.

CONCLUSIONS

Organized CRC screening is effective in improving the participation rate, regardless of SES. However, significant inequalities were found in opportunistic screening, suggesting room for improvement in the overall equity of CRC screening.

Summary

Korean summary
이번 연구는 한국의 대장암 검진에서 사회경제적 수준에 따른 불평등이 있는지를 분석했다. 국가암검진사업 도입 이래로 2009-2021년 연구기간 동안 공공검진을 통한 대장암 수검률은 지속적으로 증가한 반면, 개인검진의 증가는 관찰되지 않았다. 특히 공공 검진의 경우 소득이나 교육수준에 따른 수검률에 차이는 없는 반면, 개인검진에서는 상당한불평등이 관찰되었다.

Key Message
"The study investigated socioeconomic status (SES)-based inequality in colorectal cancer (CRC) screening in Korea. We found that the introduction of the National Cancer Screening Program for CRC effectively increased the participation rate, regardless of the SES of the individuals throughout the study period. However, significant inequalities were observed in opportunistic screening related to education and income."

Citations

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Disparities in Cancer Incidence across Income Levels in South Korea
Su-Min Jeong, Kyu-Won Jung, Juwon Park, Nayeon Kim, Dong Wook Shin, Mina Suh
Cancers.2023; 15(24): 5898. CrossRef

Association of the inflammatory balance of diet and lifestyle with colorectal cancer among Korean adults: a case-control study: Shinyoung Jun, Jeonghee Lee, Jae Hwan Oh, Hee Jin Chang, Dae Kyung Sohn, Aesun Shin, Jeongseon Kim; Epidemiol Health. 2022;44:e2022084. Published online September 30, 2022; DOI: https://doi.org/10.4178/epih.e2022084

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Abstract Summary PDF Supplementary Material

Abstract

OBJECTIVES
Dietary and lifestyle exposures may affect the risk of colorectal cancer (CRC) by promoting chronic inflammation. Therefore, we assessed the separate and joint associations of dietary and lifestyle inflammation scores (DIS and LIS, respectively) with CRC.

METHODS

Data from 919 pathologically confirmed CRC cases and 1,846 age- and sex-matched controls recruited at the National Cancer Center Korea were analyzed. We calculated the DIS and LIS, which characterize the collective contributions of 19 dietary and 4 lifestyle factors, respectively, to systemic inflammation by applying weights based on high-sensitivity C-reactive protein. A higher score represented a higher balance of pro- to anti-inflammatory exposures. Unconditional logistic regression models were used to estimate odds ratios (ORs) and 95% confidence intervals (CIs) for CRC risk compared across the DIS and LIS tertile categories, with the lowest tertile as the reference group.

RESULTS

The highest DIS tertile had significantly increased odds of having CRC (OR, 2.65; 95% CI, 2.10 to 3.36), and the odds increased with increasing DIS. The highest LIS tertile group had 1.28-fold higher odds of having CRC (95% CI, 1.03 to 1.58). In the cross-classification analysis, the odds of having CRC increased as the DIS and LIS jointly increased until the DIS reached the highest tertile, where the risk was very high (3-fold or more) regardless of the LIS.

CONCLUSIONS

In conclusion, a higher balance of pro-inflammatory relative to anti-inflammatory dietary and lifestyle factors, especially dietary factors, was associated with higher CRC risk among Korean adults.

Summary

Korean summary
본 연구는 국립암센터에서 수집한 대장암 환자-대조군 데이터를 활용하여, 새롭게 개발된 식이 염증 지수(Dietary Inflammation Score, DIS) 및 생활습관 염증 지수(Lifestyle Inflammation Score, LIS)와 대장암 발생 위험 간의 연관성을 탐색하였다. 분석 결과, 식이 염증 지수 혹은 생활습관 염증 지수가 높은 집단에서 대장암 위험이 더 높아, 식이와 생활습관이 체내 염증 수준을 높여 대장암 발생 위험을 높일 가능성이 제기되었다

Key Message
Dietary inflammation score (DIS) and lifestyle inflammation score (LIS) quantify the collective effect of dietary and lifestyle factors, respectively, on systemic inflammation. In this case-control study, we assessed the associations of DIS and LIS with colorectal cancer risk among Korean adults. Our results suggest that a higher balance of pro-to anti-inflammatory dietary and lifestyle factors may be associated with higher risk for colorectal cancer. The findings from our study support that reducing inflammation through dietary or lifestyle changes could potentially reduce the risk for colorectal cancer.

Citations

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The association of diet-dependent acid load with colorectal cancer risk: a case–control study in Korea
Tao Thi Tran, Madhawa Gunathilake, Jeonghee Lee, Jae Hwan Oh, Hee Jin Chang, Dae Kyung Sohn, Aesun Shin, Jeongseon Kim
British Journal of Nutrition.2024; 131(2): 333. CrossRef
Gout and Colorectal Cancer Likelihood: Insights from a Nested Case-Control Study of the Korean Population Utilizing the Korean National Health Insurance Service-National Sample Cohort
Mi Jung Kwon, Kyeong Min Han, Joo-Hee Kim, Ji Hee Kim, Min-Jeong Kim, Nan Young Kim, Hyo Geun Choi, Ho Suk Kang
Cancers.2023; 15(23): 5602. CrossRef
Dietary intake and cancer incidence in Korean adults: a systematic review and meta-analysis of observational studies
Ji Hyun Kim, Shinyoung Jun, Jeongseon Kim
Epidemiology and Health.2023; 45: e2023102. CrossRef

Application of a non-parametric non-mixture cure rate model for analyzing the survival of patients with colorectal cancer in Iran: Mehdi Azizmohammad Looha, Mohamad Amin Pourhoseingholi, Maryam Nasserinejad, Hadis Najafimehr, Mohammad Reza Zali; Epidemiol Health. 2018;40:e2018045. Published online September 17, 2018; DOI: https://doi.org/10.4178/epih.e2018045

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Abstract PDF

Abstract

OBJECTIVES
Colorectal cancer (CRC) patients are considered to have been cured when the mortality rate of individuals with the disease returns to the same level as expected in the general population. This study aimed to assess the impact of various risk factors on the cure fraction of CRC patients using a real dataset of Iranian CRC patients with a non-mixture non-parametric cure model.

METHODS

This study was conducted on the medical records of 512 patients who were definitively diagnosed with CRC at Taleghani Hospital, Tehran, Iran from 2001 to 2007. A non-mixture non-parametric cure rate model was applied to the data after using stepwise selection to identify the risk factors of CRC.

RESULTS

For non-cured cases, the mean survival time was 1,243.83 days (95% confidence interval [CI], 1,174.65 to 1,313.00) and the median survival time was 1,493.00 days (95% CI, 1,398.67 to 1,587.33). The 1- and 3-year survival rates were 92.9% (95% CI, 91.0 to 95.0) and 73.4% (95% CI, 68.0 to 79.0), respectively. Pathologic stage T1 of the primary tumor (estimate=0.58; p=0.013), a poorly differentiated tumor (estimate=1.17; p<0.001), a body mass index (BMI) between 18.6 and 24.9 kg/m2 (estimate=−0.60; p=0.04), and a BMI between 25.0 and 29.9 kg/m2 (estimate=−1.43; p<0.001) had significant impacts on the cure fraction of CRC in the multivariate analysis. The proportion of cured patients was 64.1% (95% CI, 56.7 to 72.4).

CONCLUSIONS

This study found that the pathologic stage of the primary tumor, tumor grade, and BMI were potential risk factors that had an impact on the cure fraction. A non-mixture non-parametric cure rate model provides a flexible framework for accurately determining the impact of risk factors on the long-term survival of patients with CRC.

Summary

Citations

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Assessment of prognostic factors in long-term survival of male and female patients with colorectal cancer using non-mixture cure model based on the Weibull distribution
Mehdi Azizmohammad Looha, Elaheh Zarean, Fatemeh Masaebi, Mohamad Amin Pourhoseingholi, Mohamad Reza Zali
Surgical Oncology.2021; 38: 101562. CrossRef
Actual survival after resection of primary colorectal cancer: results from a prospective multicenter study
Inge van den Berg, Robert R. J. Coebergh van den Braak, Jeroen L. A. van Vugt, Jan N. M. Ijzermans, Stefan Buettner
World Journal of Surgical Oncology.2021;[Epub] CrossRef

Impaired fasting glucose, single-nucleotide polymorphisms, and risk for colorectal cancer in Koreans: Keum Ji Jung, Miyong To Kim, Sun Ha Jee; Epidemiol Health. 2016;38:e2016002. Published online January 6, 2016; DOI: https://doi.org/10.4178/epih.e2016002

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Abstract

OBJECTIVES
Numerous studies have demonstrated that fasting serum glucose (FSG) levels and certain single-nucleotide polymorphisms (SNPs) are related to an increased risk of colorectal cancer (CRC); however, their combined effects are still unclear.

METHODS

Of a total of 144,527 men and women free of cancer at baseline, 317 developed CRC during 5.3 years of follow-up. A case-cohort study (n=1,691) was used, consisting of participants with a DNA sample available. Three well-known SNPs (rs3802842, rs6983267, rs10795668) were genotyped. Hazard ratios (HR) and 95% confidence intervals (CI) of CRC, colon and rectal cancer were calculated, with the Cox proportional hazard models.

RESULTS

The crude incidence rates per 100,000 person-years were 41.1 overall, 48.4 for men, and 29.3 for women. Among participants with dysglycemia, SNPs rs3802842 and rs6983267 were both associated with an increased risk of CRC (HR, 3.2; 95% CI, 1.9 to 5.5 and HR, 1.8; 95% CI, 1.1 to 3.1, respectively) and rectal cancer (HR, 3.4; 95% CI, 1.8 to 6.6 and HR, 3.3; 95% CI, 1.6 to 7.1, respectively). The interaction effect of dysglycemia and SNPs was positive, that is, resulted in an elevated risk of CRC, but was not statistically significant.

CONCLUSIONS

This study demonstrates that both high FSG and certain SNPs are major risk factors for CRC and rectal cancer but that they did not interact synergistically. The difference in effect size of the SNPs according to CRC subtype (i.e., colon or rectal cancer) and presence of dysglycemia merits further research.

Summary

Korean summary
본 연구에서는 공복혈당농도와 대장암과 관련된 단일염기다형성(SNP)과의 관련성을 살펴 보았다. 높은 공복혈당농도와 단일염기다형성(SNP_rs3802842, rs6983267)은 대장암의 주요한 위험요인이었으나, 두 가지 요인의 상호작용으로 인한 시너지 효과는 없는 것으로 나타났다. 대장암의 아형에 따른 다른 효과 크기와 이상혈당증 유무에 따른 향후 연구가 더 필요할 것으로 생각된다.

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Glycemic traits and colorectal cancer survival in a cohort of South Korean patients: A Mendelian randomization analysis
So Yon Jun, Sooyoung Cho, Min Jung Kim, Ji Won Park, Seung‐Bum Ryoo, Seung Yong Jeong, Kyu Joo Park, Aesun Shin
Cancer Medicine.2024;[Epub] CrossRef
The effect of pain-education nursing based on a mind map on postoperative pain score and quality of life in patients with colorectal cancer
Shan Li, Xiaohong Zhu, Lihua Zhang, Cui Huang, Dan Li
Medicine.2023; 102(19): e33562. CrossRef
The lncRNA CCAT2 Rs6983267 G Variant Contributes to Increased Sepsis Susceptibility in a Southern Chinese Population
Zhiyuan Wu, Yufeng Liang, Yunlong Zuo, Yufen Xu, Hanran Mai, Lei Pi, Di Che, Xiaoqiong Gu
Infection and Drug Resistance.2021; Volume 14: 2969. CrossRef
Distinct Patterns of Interleukin-12/23 and Tumor Necrosis Factor α Synthesis by Activated Macrophages are Modulated by Glucose and Colon Cancer Metabolites
Ching-Ying Huang, Linda Chia-Hui Yu
Chinese Journal of Physiology.2020; 63(1): 7. CrossRef
Glucose Metabolites Exert Opposing Roles in Tumor Chemoresistance
Chung-Yen Huang, Ching-Ying Huang, Yu-Chen Pai, Been-Ren Lin, Tsung-Chun Lee, Pi-Hui Liang, Linda Chia-Hui Yu
Frontiers in Oncology.2019;[Epub] CrossRef
Association among genetic variants in the vitamin D pathway and circulating 25-hydroxyvitamin D levels in Korean adults: results from the Korea National Health and Nutrition Examination Survey 2011–2012
So-Young Kwak, Clara Yongjoo Park, Garam Jo, Oh Yoen Kim, Min-Jeong Shin
Endocrine Journal.2018; 65(9): 881. CrossRef
Body mass index and incidence of thyroid cancer in Korea: the Korean Cancer Prevention Study-II
Hyun-Young Shin, Yong Ho Jee, Eo Rin Cho
Journal of Cancer Research and Clinical Oncology.2017; 143(1): 143. CrossRef
Heart Rate Recovery and Cancer Risk: Prospective Cohort Study
Yong Hyun Byun, Sang Yeun Kim, Yejin Mok, Youngwon Kim, Sun Ha Jee
Asia Pacific Journal of Public Health.2017; : 101053951774563. CrossRef

Predictors of Colorectal Cancer Survival in Golestan, Iran: A Population-based Study: Mohammad Aryaie, Gholamreza Roshandel, Shahryar Semnani, Mohsen Asadi-Lari, Mohsen Aarabi, Mohammad Ali Vakili, Vahideh Kazemnejhad, Seyed Mehdi Sedaghat, Masoud Solaymani-Dodaran; Epidemiol Health. 2013;35:e2013004. Published online June 20, 2013; DOI: https://doi.org/10.4178/epih/e2013004

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Abstract PDF

Abstract

<sec><title>OBJECTIVES</title>We aimed to investigate factors associated with colorectal cancer survival in Golestan, Iran.</sec><sec><title>METHODS</title>We used a population based cancer registry to recruit study subjects. All patients registered since 2004 were contacted and data were collected using structured questionnaires and trained interviewers. All the existing evidences to determine the stage of the cancer were also collected. The time from first diagnosis to death was compared in patients according to their stage of cancer using the Kaplan-Meir method. A Cox proportional hazard model was built to examine their survival experience by taking into account other covariates.</sec><sec><title>RESULTS</title>Out of a total of 345 subjects, 227 were traced. Median age of the subjects was 54 and more than 42% were under 50 years old. We found 132 deaths among these patients, 5 of which were non-colorectal related deaths. The median survival time for the entire cohort was 3.56 years. A borderline significant difference in survival experience was detected for ethnicity (log rank test, p=0.053). Using Cox proportional hazard modeling, only cancer stage remained significantly associated with time of death in the final model.</sec><sec><title>CONCLUSIONS</title>Colorectal cancer occurs at a younger age among people living in Golestan province. A very young age at presentation and what appears to be a high proportion of patients presenting with late stage in this area suggest this population might benefit substantially from early diagnoses by introducing age adapted screening programs.</sec>

Summary

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Journal of Gastrointestinal Cancer.2022; 53(1): 113. CrossRef
Colorectal cancer incidence and mortality trends by sex and population group in South Africa: 2002–2014
Lactatia Motsuku, Wenlong Carl Chen, Mazvita Molleen Muchengeti, Megan Naidoo, Tamlyn Mac Quene, Patricia Kellett, Matshediso Ivy Mohlala, Kathryn M. Chu, Elvira Singh
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Hossein Mozafar Saadati, Farzad Khodamoradi, Hamid Salehiniya
Journal of Gastrointestinal Cancer.2020; 51(2): 401. CrossRef
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Robabeh Ghodssi-Ghassemabadi, Ebrahim Hajizadeh, Shaghayegh Kamian, Mahmood Mahmoudi
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Vajiheh Ramezani Doroh, Alireza Delavari, Mehdi Yaseri, Sara Emamgholipour Sefiddashti, Ali Akbari Sari
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Mohammad Aziz Rasouli, Ghobad Moradi, Daem Roshani, Bahram Nikkhoo, Ebrahim Ghaderi, Bahman Ghaytasi
Medicine.2017; 96(6): e5941. CrossRef
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Roya Dolatkhah, Mohammad Hossein Somi, Mortaza Jabbarpour Bonyadi, Iraj Asvadi Kermani, Faris Farassati, Saeed Dastgiri
Journal of Cancer Epidemiology.2015; 2015: 1. CrossRef
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Seyed Reza Fatemi, Mohamad Amin Pourhoseingholi, Farshad Asadi, Mohsen Vahedi, Sara Pasha, Leila Alizadeh, Mohammad Reza Zali
Iranian Journal of Cancer Prevention.2015;[Epub] CrossRef
An Overview of Clinical and Pathological Characteristics and Survival Rate of Colorectal Cancer in Iran
Sareh Hoseini, Leila Moaddabshoar, Simin Hemati, Mohammad Mohammadianpanah
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Analysis of Studies on Colorectal Cancers Published in Korean Medical Journals Between 1967 and 2004.: Eunkyoung Paik, Soonduck Kim, Jesuk Lee; Korean J Epidemiol. 2007;29(2):146-154.

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Abstract PDF: Abstract
PURPOSE
The study analyzed and categorized the colorectal cancers related medical journals published in Korea by the name of the journal, research materials, study method, statistical method and by content of study for the quality improvement of colorectal cancers related studies.
METHODS
The authors reviewed a total of 567 colorectal cancer-related studies published in the Korean medical journals during the period 1967 and 2004 and kept in the National Assembly Library. The distribution of research materials, study method, statistical method and content of these studies were analyzed by the 5 year publication interval.
RESULTS
By study period, the number of published studies steeply increase during the period between 2000 and 2004. As the research materials, hospital patients(64.6%) and In-vitro(16.6%) were the most prevalently used research materials, but health adults were the lowest research materials by only taking up 0.4%. In study methods, patient follow up studies(28.7%) and human in vitro experimental(27.9%) were prevalent, and human in vitro experimental were relatively the most popular performed studies during the years of 1990-1994. As the statistical method, life table and survival analysis(27.0%) were the mostly performed methods, and the use of statistical method was applied in nearly all studies. The contents of the studies mainly focused on the patient prognostic estimations(27.6%) of therapeutic safety & efficacy(25.6%), but only the 4.1% of risk factors studies. Among the 109 studies which analyzed the survival term 78.9% of the studies mainly used the 5 year term in the analysis of survival rates.
CONCLUSION
The results of the study could be utilized as the basic data for the quality improvement of further colorectal cancers related studies.; Summary

Mortality Trends in Colorectal Cancer and Breast Cancer in Korea: Birth Cohort Effects?.: Jae Kwan Jun, Yeon Ju Kim, Jin Gwack, Yunhee Choi, Yun Chul Hong, Keun Young Yoo; Korean J Epidemiol. 2005;27(1):154-162.

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Abstract PDF: Abstract
PURPOSE
Cancer has been the leading cause of deaths since 1980s in Korea. Among them, colorectal cancer and breast cancer shows steadily increasing pattern, being the fourth and the fifth common site of cancer death in Korea, respectively. This analysis aimed to evaluate potential contribution of birth cohort effects to the recent increases in mortality of colorectal cancer and breast cancer since 1983 in Korea.
METHODS
Mortality statistics on deaths of both cancers for the past 20 years of 1983~2002 were obtained from the National Statistical Office. The age-standardized mortality rates were calculated based on the census population of 1992 as a standard.
RESULTS
Age-standardized mortality rate for colorectal cancer increased 4.7-fold in men and 3.6-fold in women, whereas 2.1-fold increase in breast cancer mortality during 1983~2002. Age-specific mortality rates for colorectal cancer were steadily increasing by age before 1991 in both genders. However, the mortality rates showed an exponentially increasing pattern for the age group of 70 and over during 1993~2001, which was more prominent in female. The birth cohort curves showed that there were 2- to 3-fold increases in the mortality rates of people who were born in 1931 for colorectal cancer compared to those of people who were born in 1921. Differences in mortality for breast cancer by birth cohort were 1.7-fold among age group of 45~49 and 50~54 between 1936 and 1946.
CONCLUSIONS
This analysis suggests that recent increases in mortality of colorectal cancer and breast cancer could potentially be due to birth cohort effects, i.e. rapid changes in life-style in younger generation. The quantitative approach using age-period-cohort model should be pursued.; Summary

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