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Zheng J, Hsu L. Risk projection for time-to-event outcome from population-based case-control studies leveraging summary statistics from the target population. LIFETIME DATA ANALYSIS 2024; 30:549-571. [PMID: 38805095 PMCID: PMC11283322 DOI: 10.1007/s10985-024-09626-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2022] [Accepted: 04/04/2024] [Indexed: 05/29/2024]
Abstract
Risk stratification based on prediction models has become increasingly important in preventing and managing chronic diseases. However, due to cost- and time-limitations, not every population can have resources for collecting enough detailed individual-level information on a large number of people to develop risk prediction models. A more practical approach is to use prediction models developed from existing studies and calibrate them with relevant summary-level information of the target population. Many existing studies were conducted under the population-based case-control design. Gail et al. (J Natl Cancer Inst 81:1879-1886, 1989) proposed to combine the odds ratio estimates obtained from case-control data and the disease incidence rates from the target population to obtain the baseline hazard function, and thereby the pure risk for developing diseases. However, the approach requires the risk factor distribution of cases from the case-control studies be same as the target population, which, if violated, may yield biased risk estimation. In this article, we propose two novel weighted estimating equation approaches to calibrate the baseline risk by leveraging the summary information of (some) risk factors in addition to disease-free probabilities from the targeted population. We establish the consistency and asymptotic normality of the proposed estimators. Extensive simulation studies and an application to colorectal cancer studies demonstrate the proposed estimators perform well for bias reduction in finite samples.
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Affiliation(s)
- Jiayin Zheng
- Fred Hutchinson Cancer Center, 1100 Fairview Ave N, M3-B232, Seattle, Washington, 98109, USA
| | - Li Hsu
- Fred Hutchinson Cancer Center, 1100 Fairview Ave N, M3-B232, Seattle, Washington, 98109, USA.
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Mohammad NMAB, Shahril MR, Shahar S, Fenech M, Sharif R. Association between Diet-related Behaviour and Risk of Colorectal Cancer: A Scoping Review. J Cancer Prev 2022; 27:208-220. [PMID: 36713941 PMCID: PMC9836915 DOI: 10.15430/jcp.2022.27.4.208] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Revised: 12/22/2022] [Accepted: 12/26/2022] [Indexed: 01/11/2023] Open
Abstract
Individual dietary patterns may be influenced by diet-related behaviours, which may eventually play a significant role in contributing to colorectal cancer risk. As nearly half of colorectal cancer cases can be prevented through diet and lifestyle modification, in this study, we aimed to present an overview of the literature on diet-related behaviour and its effect on colorectal cancer risk among adults. Articles published from 2011 until July 2021 were selected. Out of the 1,198 articles retrieved, 25 were analyzed. There were 16 case-control studies, and nine of them were cohort studies. As a finding, the instruments used in this review were food frequency questionnaires (n = 23), followed by a semi-structured interview (n = 1), and diet records (n = 1). We demonstrated that unhealthy diet-related behaviours are linked to an increased risk of colorectal cancer in adults and those food frequency questionnaires or food records are common instruments used to collect diet-related behaviours. This article imparts the research trends and directions of colorectal cancer risk factors and shows that diet-related behaviour varies and changes over time.
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Affiliation(s)
| | - Mohd Razif Shahril
- Centre of Healthy Ageing and Wellness, Faculty of Health Sciences, The National University of Malaysia, Kuala Lumpur, Malaysia
| | - Suzana Shahar
- Centre of Healthy Ageing and Wellness, Faculty of Health Sciences, The National University of Malaysia, Kuala Lumpur, Malaysia
| | | | - Razinah Sharif
- Centre of Healthy Ageing and Wellness, Faculty of Health Sciences, The National University of Malaysia, Kuala Lumpur, Malaysia,Correspondence to Razinah Sharif, E-mail: , https://orcid.org/0000-0001-7174-7353
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Haluszka E, Niclis C, Diaz MDP, Osella AR, Aballay LR. Higher dietary glycaemic index, intake of high glycaemic index foods and insulin load are associated with the risk of breast cancer, with differences according to body mass index in women from Córdoba, Argentina. Nutr Res 2022; 104:108-117. [DOI: 10.1016/j.nutres.2022.05.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2021] [Revised: 05/12/2022] [Accepted: 05/20/2022] [Indexed: 01/10/2023]
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Zhang Y, Song M, Chan AT, Schernhammer ES, Wolpin BM, Stampfer MJ, Meyerhardt JA, Fuchs CS, Roberts SB, Willett WC, Hu FB, Giovannucci EL, Ng K. Unrestrained eating behavior and risk of digestive system cancers: a prospective cohort study. Am J Clin Nutr 2021; 114:1612-1624. [PMID: 34293086 PMCID: PMC8588850 DOI: 10.1093/ajcn/nqab235] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Accepted: 06/18/2021] [Indexed: 12/24/2022] Open
Abstract
BACKGROUND Unrestrained eating behavior, as a potential proxy for diet frequency, timing, and caloric intake, has been questioned as a plausible risk factor for digestive system cancers, but epidemiological evidence remains sparse. OBJECTIVES We investigated prospectively the associations between unrestrained eating behavior and digestive system cancer risk. METHODS Participants in the Nurses' Health Study who were free of cancer and reported dietary information in 1994 were followed for ≤18 y. Cox models were used to estimate HRs and 95% CIs for unrestrained eating (eating anything at any time, no concern with figure change, or both) and risk of digestive system cancers. RESULTS During follow-up, 2064 digestive system cancer cases were documented among 70,450 eligible participants in analyses of eating anything at any time, In total, 2081 digestive system cancer cases were documented among 72,468 eligible participants in analyses of no concern with figure change. In fully adjusted analyses, women with the behavior of eating anything at any time had a higher risk of overall digestive system cancer (HR: 1.22; 95% CI: 1.10, 1.35), overall gastrointestinal tract cancer ((HR: 1.33; 95% CI: 1.18, 1.50), buccal cavity and pharynx cancer (HR: 1.50; 95% CI: 1.02, 2.21), esophageal cancer (HR: 1.62; 95% CI: 1.01, 2.62), small intestine cancer (HR: 1.92; 95% CI: 1.02,3. 59), and colorectal cancer (HR: 1.20; 95% CI: 1.04, 1.38), and a non-statistically significant increased risk of stomach cancer (HR: 1.54; 95% CI: 0.96,2.48), compared with women without this behavior. No statistically significant association was observed for pancreatic cancer and liver and gallbladder cancer. The combined effect of eating anything at any time and having no concern with figure change was associated with a significantly increased risk of overall digestive system cancer (HR: 1.27; 95% CI: 1.10, 1.46), overall gastrointestinal tract cancer (HR: 1.45; 95% CI: 1.23, 1.71), and colorectal cancer (HR: 1.34; 95% CI: 1.11, 1.63), compared with women exhibiting the opposite. CONCLUSIONS Unrestrained eating behavior was independently associated with increased risk of gastrointestinal tract cancers. The potential importance of unrestrained eating behavior modification in preventing gastrointestinal tract cancers should be noted.
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Affiliation(s)
- Yin Zhang
- Address correspondence to YZ (emails: and )
| | - Mingyang Song
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Clinical and Translational Epidemiology Unit and Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Andrew T Chan
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Clinical and Translational Epidemiology Unit and Division of Gastroenterology, Massachusetts General Hospital and Harvard Medical School, Boston, MA, USA
- Broad Institute of Massachusetts Institute of Technology and Harvard, Cambridge, MA, USA
- Department of Immunology and Infectious Diseases, Harvard T.H. Chan School of Public Health, Boston, MA, USA
| | - Eva S Schernhammer
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Department of Epidemiology, Center of Public Health, Medical University of Vienna, Vienna, Austria
| | - Brian M Wolpin
- Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA
| | - Meir J Stampfer
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Jeffrey A Meyerhardt
- Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA
| | - Charles S Fuchs
- Department of Medical Oncology, Smilow Cancer Hospital and Yale Cancer Center, New Haven, CT, USA
- Department of Medicine, Yale School of Medicine, New Haven, CT, USA
| | - Susan B Roberts
- USDA Human Nutrition Research Center on Aging, Tufts University, Boston, MA, USA
| | - Walter C Willett
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Frank B Hu
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Edward L Giovannucci
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women's Hospital and Harvard Medical School, Boston, MA, USA
- Department of Epidemiology, Harvard T. H. Chan School of Public Health, Boston, MA, USA
- Department of Nutrition, Harvard T. H. Chan School of Public Health, Boston, MA, USA
| | - Kimmie Ng
- Department of Medical Oncology, Dana-Farber Cancer Institute and Harvard Medical School, Boston, MA, USA
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Khaledi S, Jafari S, Hamidi S, Molavi O, Davaran S. Preparation and characterization of PLGA-PEG-PLGA polymeric nanoparticles for co-delivery of 5-Fluorouracil and Chrysin. JOURNAL OF BIOMATERIALS SCIENCE-POLYMER EDITION 2020; 31:1107-1126. [DOI: 10.1080/09205063.2020.1743946] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Samira Khaledi
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Sevda Jafari
- Biotechnology Research Center, Tabriz University of Medical Science, Tabriz, Iran
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Samin Hamidi
- Food and Drug Safety Research Center, Tabriz University of Medical Sciences, Tabriz, Iran
| | - Ommoleila Molavi
- Biotechnology Research Center, Tabriz University of Medical Science, Tabriz, Iran
- Department of Pharmaceutical Biotechnology, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
- Molecular Medicine Research Center, Biomedicine Institute, Tabriz University of Medical Science, Tabriz, Iran
| | - Soodabeh Davaran
- Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Tabriz University of Medical Sciences, Tabriz, Iran
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Perrigue MM, Drewnowski A, Wang CY, Song X, Kratz M, Neuhouser ML. Randomized Trial Testing the Effects of Eating Frequency on Two Hormonal Biomarkers of Metabolism and Energy Balance. Nutr Cancer 2016; 69:56-63. [PMID: 27918854 DOI: 10.1080/01635581.2017.1247888] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
BACKGROUND Eating frequency (EF) may influence obesity-related disease risk by attenuating postprandial fluctuations in hormones involved in metabolism, appetite regulation, and inflammation. MATERIALS/METHODS This randomized crossover intervention trial tested the effects of EF on fasting plasma insulin-like growth factor-I (IGF-1) and leptin. Fifteen subjects (4 males, 11 females) completed two eucaloric intervention phases lasting 21 days each: low EF ("low-EF"; 3 eating occasions/day) and high EF ("high-EF"; 8 eating occasions/day). Subjects were free-living and consumed their own meals using individualized structured meal plans with instruction from study staff. Subjects completed fasting blood draws and anthropometry on the first and last day of each study phase. The generalized estimated equations modification of linear regression tested the intervention effect on fasting serum IGF-1 and leptin. RESULTS Mean (± SD) age was 28.5 ± 8.70 years, and mean (± SD) Body Mass Index was 23.3 (3.4) kg/m2. We found lower mean serum IGF-1 following the high-EF condition compared to the low-EF condition (P < 0.001). There was no association between EF and plasma leptin (P = 0.83). CONCLUSION These results suggest that increased EF may lower serum IGF-1, which is a hormonal biomarker linked to increased risk of breast, prostate, and colorectal cancer.
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Affiliation(s)
- Martine M Perrigue
- a Cancer Prevention Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA
| | - Adam Drewnowski
- b Nutritional Sciences Program , School of Public Health, University of Washington , Seattle , Washington , USA
| | - Ching-Yun Wang
- a Cancer Prevention Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA
| | - Xiaoling Song
- a Cancer Prevention Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA.,c Translational Research Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA
| | - Mario Kratz
- a Cancer Prevention Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA.,d Department of Epidemiology , School of Public Health, University of Washington , Seattle , Washington , USA.,e Department of Medicine , University of Washington , Seattle , Washington , USA
| | - Marian L Neuhouser
- a Cancer Prevention Program , Fred Hutchinson Cancer Research Center , Seattle , Washington , USA.,b Nutritional Sciences Program , School of Public Health, University of Washington , Seattle , Washington , USA
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Abstract
Traditionally, nutrition research has focused on individual nutrients, and more recently dietary patterns. However, there has been relatively little focus on dietary intake at the level of a ‘meal’. The purpose of the present paper was to review the literature on adults' meal patterns, including how meal patterns have previously been defined and their associations with nutrient intakes and diet quality. For this narrative literature review, a comprehensive search of electronic databases was undertaken to identify studies in adults aged ≥ 19 years that have investigated meal patterns and their association with nutrient intakes and/or diet quality. To date, different approaches have been used to define meals with little investigation of how these definitions influence the characterisation of meal patterns. This review identified thirty-four and fourteen studies that have examined associations between adults' meals patterns, nutrient intakes and diet quality, respectively. Most studies defined meals using a participant-identified approach, but varied in the additional criteria used to determine individual meals, snacks and/or eating occasions. Studies also varied in the types of meal patterns, nutrients and diet quality indicators examined. The most consistent finding was an inverse association between skipping breakfast and diet quality. No consistent association was found for other meal patterns, and little research has examined how meal timing is associated with diet quality. In conclusion, an understanding of the influence of different meal definitions on the characterisation of meal patterns will facilitate the interpretation of the existing literature, and may provide guidance on the most appropriate definitions to use.
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Liu Y, Tang W, Zhai L, Yang S, Wu J, Xie L, Wang J, Deng Y, Qin X, Li S. Meta-analysis: eating frequency and risk of colorectal cancer. Tumour Biol 2013; 35:3617-25. [PMID: 24307626 DOI: 10.1007/s13277-013-1479-3] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Accepted: 11/26/2013] [Indexed: 12/14/2022] Open
Abstract
Eating frequency has been implicated in the risk of colorectal cancer (CRC) in several epidemiological studies with contradictory and inconclusive findings. We performed a meta-analysis to evaluate their relationship. The pooled relative risk (RR) with 95% confidence interval (CI) was calculated to estimate the effects. A total of 15 eligible studies with 141,431 subjects and 11,248 cases were retrieved after a comprehensive search of the PubMed, Cochrane Library, and Web of Science databases up to October 2013. The overall meta-analysis revealed no strong significant association between eating frequency and risk of CRC in different eating occasion categories (1 meal/day): RR = 1.01, 95% CI 0.94-1.09, P = 0.709; 3 vs. <3 daily meals: RR = 1.17, 95% CI 0.93-1.46; 4 vs. <3 daily meals: RR = 1.13, 95% CI 0.92-1.38; ≥ 5 vs. <3 daily meals: RR = 0.95, 95% CI 0.61-1.47; 4 vs. ≤ 3 daily meals: RR = 1.18, 95% CI 0.92-1.51; and 1-2 vs. 3 or 4 daily meals: RR = 0.82, 95% CI 0.63-1.06). However, modest evidence of an increased risk of CRC in case-control studies (RR = 1.30; 95% CI, 1.11-1.52) and ≥ 5 vs. ≤ 3 meals group (RR = 1.30; 95% CI, 1.11-1.52) was observed. Our meta-analysis results do not support the hypothesis that eating frequency strongly reduced or increased the risk of CRC. Clinical randomized trials are required to evaluate this relationship further.
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Affiliation(s)
- Yanqiong Liu
- Department of Clinical Laboratory, First Affiliated Hospital of Guangxi Medical University, Nanning, Guangxi, China
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Eating frequency and risk of colorectal cancer. Cancer Causes Control 2013; 24:2107-15. [PMID: 24057417 DOI: 10.1007/s10552-013-0288-8] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2013] [Accepted: 09/04/2013] [Indexed: 12/20/2022]
Abstract
PURPOSE Eating frequency is a modifiable aspect of dietary behavior that may affect risk of colorectal cancer (CRC). Although most previous case-control studies indicate a positive association, two prospective studies suggest an inverse association between eating frequency and CRC risk, with evidence of effect modification by diet composition. We examined the association between eating frequency and CRC in a large, prospective cohort study, and explored whether this relationship was modified by sex, coffee consumption, or dietary glycemic load. METHODS Between 2000 and 2002, 67,912 western Washington residents aged 50-76 reported average daily meal and snack frequency using a mailed questionnaire as part of the vitamins and lifestyle study. Participants were followed for CRC through linkage with SEER through 2008, over which time 409 CRC cases developed. Hazard Ratios and 95 % Confidence Intervals were obtained using Cox regression. RESULTS In age- and sex-adjusted models higher (5+ times/d) vs. lower (1-2 times/d) eating frequency was associated with a HR of 0.62 (95 % CI 0.43-0.88, Ptrend = 0.001). However, following further adjustment for BMI, race/ethnicity, alcohol, and other known CRC risk factors, the relationship was no longer statistically significant (HR: 0.76; 95 % CI 0.51, 1.14). No effect modification was observed by sex (Pinteraction = 0.45), coffee consumption (Pinteraction = 0.44), or dietary glycemic load (Pinteraction = 0.90). In subgroup analyses by tumor site, higher vs. lower eating frequency was associated with lower risk for colon (HR 0.65 95 % CI 0.39-1.07, Ptrend = 0.04), but not rectal cancers (HR = 1.08 95 % CI 0.54-2.18, Ptrend = 0.94). CONCLUSION The weak inverse association observed between eating frequency and CRC is consistent with findings from other prospective studies. Modification of this relationship by diet quality and participant characteristics should be considered in the future studies.
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Freedman AN, Slattery ML, Ballard-Barbash R, Willis G, Cann BJ, Pee D, Gail MH, Pfeiffer RM. Colorectal cancer risk prediction tool for white men and women without known susceptibility. J Clin Oncol 2008; 27:686-93. [PMID: 19114701 DOI: 10.1200/jco.2008.17.4797] [Citation(s) in RCA: 181] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022] Open
Abstract
PURPOSE Given the high incidence of colorectal cancer (CRC), and the availability of procedures that can detect disease and remove precancerous lesions, there is a need for a model that estimates the probability of developing CRC across various age intervals and risk factor profiles. METHODS The development of separate CRC absolute risk models for men and women included estimating relative risks and attributable risk parameters from population-based case-control data separately for proximal, distal, and rectal cancer and combining these estimates with baseline age-specific cancer hazard rates based on Surveillance, Epidemiology, and End Results (SEER) incidence rates and competing mortality risks. RESULTS For men, the model included a cancer-negative sigmoidoscopy/colonoscopy in the last 10 years, polyp history in the last 10 years, history of CRC in first-degree relatives, aspirin and nonsteroidal anti-inflammatory drug (NSAID) use, cigarette smoking, body mass index (BMI), current leisure-time vigorous activity, and vegetable consumption. For women, the model included sigmoidoscopy/colonoscopy, polyp history, history of CRC in first-degree relatives, aspirin and NSAID use, BMI, leisure-time vigorous activity, vegetable consumption, hormone-replacement therapy (HRT), and estrogen exposure on the basis of menopausal status. For men and women, relative risks differed slightly by tumor site. A validation study in independent data indicates that the models for men and women are well calibrated. CONCLUSION We developed absolute risk prediction models for CRC from population-based data, and a simple questionnaire suitable for self-administration. This model is potentially useful for counseling, for designing research intervention studies, and for other applications.
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Affiliation(s)
- Andrew N Freedman
- Division of Cancer Control and Population Sciences, National Cancer Institute, National Institutes of Health, EPN 4005 MSC 7344, Bethesda, MD 20892-7344, USA.
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Sun XW, Wu SL, Lin YJ, Wang B, Han HL, Dai XD. Trend of morbidity and mortality of colorectal carcinoma in Nangang District of Harbin from 1992 to 2001. Shijie Huaren Xiaohua Zazhi 2004; 12:2302-2306. [DOI: 10.11569/wcjd.v12.i10.2302] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To determine the epidemiological characteristics of colorectal carcinoma (CRC) morbidity and mortality in Nangang District, Harbin, and to indicate the harmful effect of CRC on the people in that community.
METHODS: The data on morbidity and mortality of CRC in Nangang District (1992-2001) were sorted and coded according to ICD-9 criteria. The crude morbidity and mortality, age-standardized morbidity and mortality (adjusted by the world population), truncated morbidity and mortality (35-64 years old) as well as cumulative rates (0-65 years old) were calculated respectively. Trend u-test and u-test were adopted to analyze the preceding data. The morbidity and mortality in the near future were predicted based on Gray Modeling (GM1, 1).
RESULTS: The CRC morbidity and mortality had been significantly increasing year by year (u = 2.45, P <0.05; u = 1.97, P <0.05 respectively). The morbidity increased from 13.06/100 000 (1992-1993) to 19.37/100 000 (2000-2001) with an average of 4.83% for each year. The mortality for males and females increased from 2.83/100 000, 3.61/100 000 (1992-1993) to 9.60/100 000, 7.90/100 000 (2000-2001) with an anverage of 23.92% (u = 1.47, P >0.05) and 11.88% (u = 1.97, P <0.05) respectively. The age-standardized morbidity (adjusted by the world population) for males and females increased with a rate of 3.24% and 1.19% respectively. And the corresponding rates for mortality were 17.31% and 7.69% respectively. The cumulative and truncated morbidities were also increasing. The cumulative and truncated mortalities increased at an annual rate of 26.00%, 24.95% for males and 11.67%, 10.87 for females. The predicted morbidity and mortality were 28.15/100 000, 13.43/100 000 for males and 24.16/100 000, 20.45/100 000 for females respectively in 2006.
CONCLUSION: The morbidity and mortality of CRC have increased in 1992-2001, and will keep on increasing in the future, which are expected to reach 26.12/100 000 and 17.43/100 000 in 2006, respectively.
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Abstract
Increased exposure of the colon to bile acids, as a result of increased eating frequency, might promote the development of colon cancer. Our aim was to evaluate the association between eating frequency and colon cancer. We used data from a population-based case-control study of colon cancer in North Carolina. Eating frequency (a combination of meals and snacks) was categorized as fewer than three, three or four, or more than four eating episodes per day. Multivariate logistic regression was used to calculate odds ratios (ORs) for the association between eating frequency and colon cancer, adjusting for confounders. We also performed stratified analyses to evaluate for differences by sex, coffee intake, or tumor site. Six hundred thirty-six participants with colon cancer and 1,048 control participants were included. The effect of eating frequency on colon cancer differed by sex. Among men, participants in the lowest group of eating frequency had approximately half the risk of colon cancer compared with the middle group (adjusted OR = 0.53; 95% confidence interval, CI = 0.30-0.92). Compared with the middle group, men in the highest group had no greater risk of cancer (adjusted OR = 1.03; 95% CI = 0.74-1.44). No significant associations were detected among women. Decreased eating frequency was associated with a lower risk of colon cancer among men but not women.
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Affiliation(s)
- Jeffrey T Wei
- Center for Gastrointestinal Biology and Disease, University of North Carolina, Chapel Hill 27599-7080, USA.
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Ahmed FE. Effect of diet, life style, and other environmental/chemopreventive factors on colorectal cancer development, and assessment of the risks. JOURNAL OF ENVIRONMENTAL SCIENCE AND HEALTH. PART C, ENVIRONMENTAL CARCINOGENESIS & ECOTOXICOLOGY REVIEWS 2004; 22:91-147. [PMID: 16291519 DOI: 10.1081/lesc-200038263] [Citation(s) in RCA: 52] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
This review presents a comprehensive, evenhanded evaluation of the evidence from experimental, in vitro and human studies associating environmental and therapeutic factors with risk of colorectal cancer. Life styles correlated with the greatest increase in colorectal cancer risk are the ones that typify a diet rich in fat and calories, alcohol drinking and tobacco smoking, and low intake of vegetable, fruits and fibers, referred to as a "western diet," as well as sedentary style (i.e., no- or low-exercise). This kind of life style has also been associated with other chronic diseases (other cancers, obesity, dyslipedemia, diabetes, hypertension cardiovascular, and hypertension). The evidence does not implicated red meat as a risk factor, and fiber has been shown to protect against colorectal adenomas and carcinomas. Calcium, vitamin D, folate, and some antioxidant vitamins and minerals (gamma-tocopherol and selenium) have protective effects, and daily exercise for > or =30 min results in a significant decrease in risk. Estrogen use (hormone replacement therapy) substantially reduces colorectal cancer risk in postmenopausal women. Nonsteroidal anti-inflammatory drugs (e.g., aspirin) in excessive doses is protective, especially in high risk populations, but the side effects of its use and cost incurred due to its continued intake over long periods must be carefully scrutinized before any recommendations are made for the general public.
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Affiliation(s)
- Farid E Ahmed
- Department of Radiation Oncology, Leo W. Jenkins Cancer Center, The Brody School of Medicine, East Carolina University, Greenville, NC 27858, USA.
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