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Liang PS, Shaukat A, Crockett SD. AGA Clinical Practice Update on Chemoprevention for Colorectal Neoplasia: Expert Review. Clin Gastroenterol Hepatol 2021; 19:1327-1336. [PMID: 33581359 DOI: 10.1016/j.cgh.2021.02.014] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 10/05/2020] [Revised: 02/02/2021] [Accepted: 02/08/2021] [Indexed: 02/07/2023]
Abstract
DESCRIPTION The purpose of this expert review is to describe the role of medications for the chemoprevention of colorectal neoplasia. Neoplasia is defined as precancerous lesions (e.g., adenoma and sessile serrated lesion) or cancer. The scope of this review excludes dietary factors and high-risk individuals with hereditary syndromes or inflammatory bowel disease. METHODS The best practice advice statements are based on a review of the literature to provide practical advice. A formal systematic review and rating of the quality of evidence or strength of recommendation were not performed. BEST PRACTICE ADVICE 1: In individuals at average risk for CRC who are (1) younger than 70 years with a life expectancy of at least 10 years, (2) have a 10-year cardiovascular disease risk of at least 10%, and (3) not at high risk for bleeding, clinicians should use low-dose aspirin to reduce CRC incidence and mortality. BEST PRACTICE ADVICE 2: In individuals with a history of CRC, clinicians should consider using aspirin to prevent recurrent colorectal neoplasia. BEST PRACTICE ADVICE 3: In individuals at average risk for CRC, clinicians should not use non-aspirin NSAIDs to prevent colorectal neoplasia because of a substantial risk of cardiovascular and gastrointestinal adverse events. BEST PRACTICE ADVICE 4: In individuals with type 2 diabetes, clinicians may consider using metformin to prevent colorectal neoplasia. BEST PRACTICE ADVICE 5: In individuals with CRC and type 2 diabetes, clinicians may consider using metformin to reduce mortality. BEST PRACTICE ADVICE 6: Clinicians should not use calcium or vitamin D (alone or together) to prevent colorectal neoplasia. BEST PRACTICE ADVICE 7: Clinicians should not use folic acid to prevent colorectal neoplasia. BEST PRACTICE ADVICE 8: In individuals at average risk for CRC, clinicians should not use statins to prevent colorectal neoplasia. BEST PRACTICE ADVICE 9: In individuals with a history of CRC, clinicians should not use statins to reduce mortality.
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Affiliation(s)
- Peter S Liang
- NYU Langone Health, New York, New York; VA New York Harbor Health Care System, New York, New York.
| | - Aasma Shaukat
- University of Minnesota, Minneapolis, Minnesota; Minneapolis VA Health Care System, Minneapolis, Minnesota
| | - Seth D Crockett
- University of North Carolina School of Medicine, Chapel Hill, North Carolina
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The Influence of Statins on Risk and Patient Survival in Colorectal Cancer. J Clin Gastroenterol 2019; 53:699-701. [PMID: 28697149 DOI: 10.1097/mcg.0000000000000844] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/10/2022]
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Statin use and the risk of colorectal cancer in a population-based electronic health records study. Sci Rep 2019; 9:13560. [PMID: 31537841 PMCID: PMC6753123 DOI: 10.1038/s41598-019-49877-5] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2018] [Accepted: 08/30/2019] [Indexed: 12/12/2022] Open
Abstract
There is extensive debate regarding the protective effect of 3-hydroxy-3-methylglutaryl-coenzyme A reductase inhibitors (statins) on colorectal cancer (CRC). We aimed to assess the association between CRC risk and exposure to statins using a large cohort with prescription data. We carried out a case-control study in Catalonia using the System for Development of Primary Care Research (SIDIAP) database that recorded patient diseases history and linked data on reimbursed medication. The study included 25 811 cases with an incident diagnosis of CRC between 2010 and 2015 and 129 117 frequency-matched controls. Subjects were classified as exposed to statins if they had ever been dispensed statins. Analysis considering mean daily defined dose, cumulative duration and type of statin were performed. Overall, 66 372 subjects (43%) were exposed to statins. There was no significant decrease of CRC risk associated to any statin exposure (OR = 0.98; 95% CI: 0.95–1.01). Only in the stratified analysis by location a reduction of risk for rectal cancer was observed associated to statin exposure (OR = 0.87; 95% CI: 0.81–0.92). This study does not support an overall protective effect of statins in CRC, but a protective association with rectal cancer merits further research.
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Liu JC, Hao WR, Hsu YP, Sung LC, Kao PF, Lin CF, Wu ATH, Yuan KSP, Wu SY. Statins dose-dependently exert a significant chemopreventive effect on colon cancer in patients with chronic obstructive pulmonary disease: A population-based cohort study. Oncotarget 2018; 7:65270-65283. [PMID: 27542242 PMCID: PMC5323154 DOI: 10.18632/oncotarget.11263] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2016] [Accepted: 06/27/2016] [Indexed: 12/21/2022] Open
Abstract
Purpose We evaluated the chemopreventive effect of statins on colon cancer in patients with chronic obstructive pulmonary disease (COPD) and identified the statin exerting the strongest chemopreventive effect. Methods Using the National Health Insurance Research Database, we identified patients who received a COPD diagnosis in Taiwan between January 1, 2001, and December 31, 2012, and included them in the study cohort. Each patient was followed to assess the colon cancer risk and protective factors. A propensity score was derived using a logistic regression model to estimate the effect of statins by accounting for covariates predicted during the intervention (statins). To examine the dose–response relationship, we categorized statin doses into four groups in each cohort [<28, 28–90, 91–365, and >365 cumulative defined daily dose]. Results Compared with the statin nonusers, the adjusted hazard ratio (aHR) for colon cancer decreased in the statin users (aHR = 0.52, 95% confidence interval = 0.44, 0.62). Hydrophilic statins exerted a stronger preventive effect against colon cancer. Regarding the statin type, lovastatin, pravastatin, and fluvastatin nonsignificantly reduced the colon cancer risk in the patients with COPD. Compared with the statin nonusers, the aHRs for colon cancer decreased in the individual statin users (rosuvastatin, simvastatin, and atorvastatin: aHRs = 0.28, 0.64, and 0.65, respectively). In the sensitivity analysis, statins dose-dependently reduced the colon cancer risk. Conclusions Statins dose-dependently exert significant chemopreventive effects on colon cancer in patients with COPD, with rosuvastatin exerting the largest chemopreventive effect.
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Affiliation(s)
- Ju-Chi Liu
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan.,Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Wen-Rui Hao
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan
| | - Yi-Ping Hsu
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan
| | - Li-Chin Sung
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan.,Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Pai-Feng Kao
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan.,Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan
| | - Chao-Feng Lin
- Division of Cardiovascular Medicine, Department of Internal Medicine, Shuang Ho Hospital, Taipei Medical University, New Taipei, Taiwan
| | - Alexander T H Wu
- Ph.D. Program for Translational Medicine, Taipei Medical University, Taipei, Taiwan
| | - Kevin Sheng-Po Yuan
- Department of Otorhinolaryngology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan
| | - Szu-Yuan Wu
- Institute of Toxicology, College of Medicine, National Taiwan University, Taipei, Taiwan.,Department of Radiation Oncology, Wan Fang Hospital, Taipei Medical University, Taipei, Taiwan.,Department of Internal Medicine, School of Medicine, College of Medicine, Taipei Medical University, Taipei, Taiwan.,Department of Biotechnology, Hungkuang University, Taichung, Taiwan
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Sehdev A, O'Neil BH. The Role of Aspirin, Vitamin D, Exercise, Diet, Statins, and Metformin in the Prevention and Treatment of Colorectal Cancer. Curr Treat Options Oncol 2016; 16:43. [PMID: 26187794 DOI: 10.1007/s11864-015-0359-z] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Colorectal cancer (CRC) is a worldwide health problem leading to significant morbidity and mortality. Several strategies based on either lifestyle modifications or pharmacological interventions have been developed in an attempt to reduce the risk of CRC. In this review article, we discuss these interventions including aspirin (and other non-steroidal anti-inflammatory drugs), vitamin D, exercise, diet, statins, and metformin. Depending upon the risk of developing CRC, the current evidence supports the beneficial role of aspirin, vitamin D, diet, and exercise especially in high-risk individuals (advanced adenoma or CRC). However, even with these established interventions, there are significant knowledge gaps such as doses of aspirin and 25-hydroxy vitamin D are not well established. Similarly, there is no convincing data from randomized controlled trials that a high fiber diet or a low animal fat diet reduces the risk of CRC. Some potential interventions, such as statins and metformin, do not have convincing data for clinical use even in high-risk individuals. However, these may have emerging roles in the prevention and treatment of CRC. Greater understanding of molecular mechanisms and the application of genomic tools to risk stratify an individual and tailor the interventions based on that individual's risk will help further advance the field. Some of this work is already underway and is a focus of this article.
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Affiliation(s)
- Amikar Sehdev
- Division of Hematology Oncology, Department of Medicine, Indiana University, 535 Barnhill Dr., RT 130B, Indianapolis, IN, 46202, USA,
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Li JW, Tan MTK, Ang TL, Teo EK. Chemoprevention trials of GI cancers in Asia. Best Pract Res Clin Gastroenterol 2015; 29:967-78. [PMID: 26651257 DOI: 10.1016/j.bpg.2015.09.014] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 07/01/2015] [Accepted: 09/02/2015] [Indexed: 01/31/2023]
Abstract
Cancers are among the leading causes of morbidity and mortality worldwide, with gastrointestinal (GI) luminal cancers accounting for a large proportion of cancer incidence. Chemoprevention of GI luminal cancers is important to reduce this cancer burden. Screening for and eradication of Helicobacter pylori (H. pylori) in areas with high gastric cancer incidence is a safe and effective strategy to decrease the incidence of gastric cancer. Eradication of H. pylori also seems to be effective in preventing metachronous cancer development after endoscopic resection of early gastric cancer. For the average risk individual, COX inhibitors may have a role in reducing the incidence of adenoma formation as well as colorectal cancer, bearing in mind its inherent risks. There is currently insufficient evidence to recommend a chemoprevention agent against esophageal and small intestine cancer.
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Affiliation(s)
- James Weiquan Li
- Department of Gastroenterology and Hepatology, Changi General Hospital, Singapore.
| | | | - Tiing Leong Ang
- Department of Gastroenterology and Hepatology, Changi General Hospital, Singapore.
| | - Eng Kiong Teo
- Department of Gastroenterology and Hepatology, Changi General Hospital, Singapore.
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Hoffmeister M, Jansen L, Rudolph A, Toth C, Kloor M, Roth W, Bläker H, Chang-Claude J, Brenner H. Statin use and survival after colorectal cancer: the importance of comprehensive confounder adjustment. J Natl Cancer Inst 2015; 107:djv045. [PMID: 25770147 DOI: 10.1093/jnci/djv045] [Citation(s) in RCA: 85] [Impact Index Per Article: 9.4] [Reference Citation Analysis] [Abstract] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022] Open
Abstract
BACKGROUND Statins have been associated with moderate reductions in mortality among colorectal cancer (CRC) patients, but these studies lacked adjustment for some potentially relevant factors associated with statin use. We aimed to provide more detailed results on this association from a population-based patient cohort study. METHODS Use of statins and other risk or protective factors were assessed in standardized interviews with 2697 patients from southern Germany with a diagnosis of incident CRC between 2003 and 2009 (Darmkrebs: Chancen der Verhütung durch Screening [DACHS] study). Follow-up included assessment of therapy details, recurrence, vital status, and cause of death. Information about molecular pathological subtypes of CRC was available for 1209 patients. Cox proportional hazard regression models were used to estimate adjusted hazard ratios (HRs) and their 95% confidence intervals (CIs). All statistical tests were two-sided. RESULTS Patients were age 68 years on average, 412 used statins (15%), and 769 died during follow-up (29%). After a median follow-up time of 3.4 years, use of statins was not associated with overall (HR = 1.10, 95% CI = 0.85 to 1.41), CRC-specific (HR = 1.11, 95% CI = 0.82 to 1.50), or recurrence-free survival (HR = 0.90, 95% CI = 0.63 to 1.27). Analyses in relevant subgroups also showed no association of statin use with overall and CRC-specific survival, and no associations were observed after stratifying for major pathological subtypes. Among stage I and II patients, statin use was associated with better recurrence-free but not with better CRC-specific survival. CONCLUSIONS Statin use was not associated with reduced mortality among CRC patients. Effects reported in previous studies might reflect incomplete control for stage at diagnosis and other factors associated with the use of statins.
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Affiliation(s)
- Michael Hoffmeister
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr).
| | - Lina Jansen
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Anja Rudolph
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Csaba Toth
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Matthias Kloor
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Wilfried Roth
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Hendrik Bläker
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Jenny Chang-Claude
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
| | - Hermann Brenner
- Division of Clinical Epidemiology and Aging Research (MH, LJ, HBr), Division of Cancer Epidemiology (AR, JCC), and Unit of Molecular Tumor Pathology (WR), German Cancer Research Center (DKFZ), Heidelberg, Germany; Department of Pathology (CT, WR) and Department of Applied Tumor Biology (MK), Institute of Pathology, Heidelberg University Hospital, Germany; Institute of Pathology, Charité University Medicine, Berlin, Germany (HBl); German Cancer Consortium (DKTK), Heidelberg, Germany (HBr)
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Cardel M, Jensen SM, Pottegård A, Jørgensen TL, Hallas J. Long-term use of metformin and colorectal cancer risk in type II diabetics: a population-based case-control study. Cancer Med 2014; 3:1458-66. [PMID: 25091592 PMCID: PMC4302696 DOI: 10.1002/cam4.306] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2014] [Revised: 06/24/2014] [Accepted: 06/24/2014] [Indexed: 12/13/2022] Open
Abstract
In vitro and animal studies indicate that metformin prevents colorectal cancer (CRC). Epidemiological studies, however, have been equivocal. We undertook this study to assess whether metformin prevents CRC in individuals with type II diabetes. We performed a nested case–control study restricted to Danish citizens with type II diabetes. Data were collected from four Danish nationwide registries. Cases were type II diabetics with a primary CRC between 2000 and 2009, and controls were sampled among subjects with type II diabetes. Long-term exposure to metformin was defined by the redeeming of prescriptions for a cumulative dose of 2000 g within 5 years prior to the index date. To control for potential confounders, we used unconditional logistic regression. We generated adjusted odds ratios (OR) for the association between metformin and CRC and performed subanalyses for selected subgroups and for the dose–response relation. We identified 2088 cases and 9060 controls during the study period. The association between long-term metformin use and CRC gave an adjusted OR at 0.83 (95% CI 0.68–1.00). A protective effect on CRC with long-term use of metformin was only evident for women (OR 0.66 vs. 0.99 for men). There was a significant dose–response association of metformin use >250 defined daily dose (DDD) and for the duration of metformin use >1 year. We found an indication of a protective effect of long-term metformin use against CRC in type II diabetics, although this effect was only seen in women.
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Affiliation(s)
- Majken Cardel
- Hospital Pharmacy, Hospital Lillebaelt, Vejle, Region South, Denmark
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Lytras T, Nikolopoulos G, Bonovas S. Statins and the risk of colorectal cancer: an updated systematic review and meta-analysis of 40 studies. World J Gastroenterol 2014; 20:1858-70. [PMID: 24587664 PMCID: PMC3930985 DOI: 10.3748/wjg.v20.i7.1858] [Citation(s) in RCA: 74] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/30/2013] [Revised: 11/13/2013] [Accepted: 01/06/2014] [Indexed: 02/06/2023] Open
Abstract
AIM To investigate the association between statin use and colorectal cancer risk, we conducted an updated meta-analysis of published studies. METHODS We performed a comprehensive search for studies published up to July 2013. Eligible studies for this meta-analysis were either randomized controlled trials (RCTs) or observational studies (case-control or cohort) evaluating any exposure to statins and the risk of colorectal cancer. Two reviewers selected studies based on predefined inclusion criteria, and abstracted the data. Pooled relative risk (RR) estimates with their 95%CI were calculated using fixed- and random-effects models. Then, we assessed the potential presence of publication bias and between-studies heterogeneity. To evaluate the results, we also performed a "leave-one-out" sensitivity analysis. RESULTS A total of 40 studies, involving more than eight million subjects, contributed to the analysis. They were grouped on the basis of study design and, consequently, three separate meta-analyses were conducted. A similar modest reduction in the risk of colorectal cancer with statin use was observed, which was not statistically significant among RCTs (RR = 0.89, 95%CI: 0.74-1.07; n = 8), but reached statistical significance among cohort studies (RR = 0.91, 95%CI: 0.83-1.00; n = 13) and case-control studies (RR = 0.92, 95%CI: 0.87-0.98; n = 19). While we did not find significant evidence of selective outcome reporting or publication bias, substantial heterogeneity was detected, mainly among the observational studies. The sensitivity analysis confirmed the stability of our results. CONCLUSION A modest reduction in risk of colorectal cancer among statin users cannot be disproved. Further targeted research is warranted.
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Association between statin use and colorectal cancer risk: a meta-analysis of 42 studies. Cancer Causes Control 2013; 25:237-49. [PMID: 24265089 DOI: 10.1007/s10552-013-0326-6] [Citation(s) in RCA: 95] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2013] [Accepted: 11/14/2013] [Indexed: 12/23/2022]
Abstract
PURPOSE There is a long-standing debate about whether statins have chemopreventive properties against colorectal cancer (CRC), but the results remain inconclusive. We therefore present a meta-analysis to investigate the association between statin use and risk of CRC. METHODS A comprehensive literature search was undertaken through July 2013 looking for eligible studies. Pooled relative risk (RR) estimates and 95 % confidence intervals (CIs) were used to calculate estimated effect. RESULTS Forty-two studies [18 case-control studies, 13 cohort studies, and 11 randomized controlled trials (RCTs)] were included in this analysis. Overall, statin use was associated with a modest reduction in the risk of CRC (RR = 0.90, 95 % CI 0.86-0.95). When the analyses were stratified into subgroups, a significant decreased association of CRC risk was observed in observational studies (RR = 0.89, 95 % CI 0.84-0.95), rectal cancer (RR = 0.81, 95 % CI 0.66-0.99), and lipophilic statin (RR = 0.88, 95 % CI 0.85-0.93), but not in RCTs (RR = 0.96, 95 % CI 0.85-1.08), colon cancer, and hydrophilic statin. However, long-term statin use (≥5 years) did not significantly affect the risk of CRC (RR = 0.96, 95 % CI 0.90-1.03). Cumulative meta-analysis showed that statin use significantly reduces the risk of CRC, which has been available between 2007 and 2013. CONCLUSIONS Our results suggest that statin use is associated with a modest reduced risk of CRC; apparent associations were found for lipophilic statin use. However, long-term statin use did not appear to significantly affect the risk of CRC.
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Abstract
Cancer risk reduction using pharmacological means is an attractive modern preventive approach that supplements the classical behavioural prevention recommendations. Medications that are commonly used by large populations to treat a variety of common, non-cancer-related, medical situations are an attractive candidate pool. This Review discusses three pharmacological agents with the most evidence for their potential as cancer chemopreventive agents: anti-hypercholesterolaemia medications (statins), an antidiabetic agent (metformin) and antiosteoporosis drugs (bisphosphonates). Data are accumulating to support a significant negative association of certain statins with cancer occurrence or survival in several major tumour sites (mostly gastrointestinal tumours and breast cancer), with an augmented combined effect with aspirin or other non-steroidal anti-inflammatory drugs. Metformin, but not other hypoglycaemic drugs, also seems to have some antitumour growth activity, but the amount of evidence in human studies, mainly in breast cancer, is still limited. Experimental and observational data have identified bisphosphonates as a pharmacological group that could have significant impact on incidence and mortality of more than one subsite of malignancy. At the current level of evidence these potential chemopreventive drugs should be considered in high-risk situations or using the personalized approach of maximizing individual benefits and minimizing the potential for adverse effects with the aid of pharmacogenetic indicators.
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Chun KS, Kim EH, Lee S, Hahm KB. Chemoprevention of gastrointestinal cancer: the reality and the dream. Gut Liver 2013; 7:137-49. [PMID: 23560148 PMCID: PMC3607766 DOI: 10.5009/gnl.2013.7.2.137] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 05/30/2012] [Revised: 07/03/2012] [Accepted: 09/17/2012] [Indexed: 12/17/2022] Open
Abstract
Despite substantial progress in screening, early diagnosis, and the development of noninvasive technology, gastrointestinal (GI) cancer remains a major cause of cancer-associated mortality. Chemoprevention is thought to be a realistic approach for reducing the global burden of GI cancer, and efforts have been made to search for chemopreventive agents that suppress acid reflux, GI inflammation and the eradication of Helicobacter pylori. Thus, proton pump inhibitors, statins, monoclonal antibodies targeting tumor necrosis factor-alpha, and nonsteroidal anti-inflammatory agents have been investigated for their potential to prevent GI cancer. Besides the development of these synthetic agents, a wide variety of the natural products present in a plant-based diet, which are commonly called phytoceuticals, have also sparked hope for the chemoprevention of GI cancer. To perform successful searches of chemopreventive agents for GI cancer, it is of the utmost importance to understand the factors contributing to GI carcinogenesis. Emerging evidence has highlighted the role of chronic inflammation in inducing genomic instability and telomere shortening and affecting polyamine metabolism and DNA repair, which may help in the search for new chemopreventive agents for GI cancer.
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Lochhead P, Chan AT. Statins and colorectal cancer. Clin Gastroenterol Hepatol 2013; 11:109-18; quiz e13-4. [PMID: 22982096 PMCID: PMC3703461 DOI: 10.1016/j.cgh.2012.08.037] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/17/2012] [Accepted: 08/28/2012] [Indexed: 02/07/2023]
Abstract
The 3-hydroxy-3-methylglutaryl-coenzyme A reductase inhibitors, more commonly referred to as statins, comprise a family of lipid-lowering drugs that are prescribed on a global scale on account of their proven safety and efficacy in reducing mortality from cardiovascular disease. Beyond their potent pharmacologic inhibition of cholesterol biosynthesis, statins appear to have pleiotropic effects, including modulation of cell growth, apoptosis, and inflammation. Through modulation of these pathways, statins have the potential to influence a wide range of disease processes, including cancer. Much attention has focused on the association between statins and colorectal cancer, raising the prospect that these well-tolerated compounds could form the basis of future chemopreventive strategies. Herein, we review the epidemiologic, clinical, and preclinical data relevant to statins and colorectal neoplasia, and discuss the current status and future potential of statins as chemopreventive agents.
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Affiliation(s)
- Paul Lochhead
- Gastrointestinal Research Group, Division of Applied Medicine, Institute of Medical Sciences, University of Aberdeen, Aberdeen, United Kingdom
| | - Andrew T Chan
- Channing Division of Network Medicine, Department of Medicine, Brigham and Women’s Hospital, and Harvard Medical School, Boston, MA
- Division of Gastroenterology, Massachusetts General Hospital, Boston, MA
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Leung HWC, Chan ALF, Lo D, Leung JH, Chen HL. Common cancer risk and statins: a population-based case-control study in a Chinese population. Expert Opin Drug Saf 2012. [PMID: 23199231 DOI: 10.1517/14740338.2013.744392] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
OBJECTIVE To investigate whether the use of statins is associated with common cancer risk. METHODS A population-based case-control study was conducted in Taiwan. Cases were defined as all patients who were aged 18 years and older and had received at least two statin prescriptions for use continuously for at least 6 months before a first-time diagnosis of studied cancers between the period of 2000 and 2008. The controls were matched to cases by age, sex, and index date. Adjusted hazard ratios (HRs) and 95% confidence intervals (CIs) were estimated by using the Cox proportional hazards model. RESULTS A total of 6841 cases and 27,364 matched controls were analyzed. The adjusted hazard ratio for any statin use and cancer at any site were 0.76 (95% 0.654, 0.891). There were a significant reduced risk of gastric cancer (HR: 0.26, 95% CI: 0.107, 0.588), liver cancer (HR: 0.44, 95% CI: 0.279, 0.723) and uterine cancer (HR: 0.44, 95% CI: 0.279, 0.723) associated with any statins. CONCLUSION Overall, the statins suggested a significant reduced risk of the most common cancers in a large Chinese population, particularly in gastric, liver, and uterine cancers.
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Affiliation(s)
- Henry W C Leung
- Min Sheng General Hospital, Cancer Center, Department of Radiation Therapy, Taipei, 168, Jingguo Road, Taoyuan City, Taoyuan County 330, Taiwan
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Serum Lipids and the Risk of Gastrointestinal Malignancies in the Swedish AMORIS Study. J Cancer Epidemiol 2012; 2012:792034. [PMID: 22969802 PMCID: PMC3437288 DOI: 10.1155/2012/792034] [Citation(s) in RCA: 58] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2012] [Accepted: 07/17/2012] [Indexed: 12/16/2022] Open
Abstract
Background. Metabolic syndrome has been linked to an increased cancer risk, but the role of dyslipidaemia in gastrointestinal malignancies is unclear. We aimed to assess the risk of oesophageal, stomach, colon, and rectal cancers using serum levels of lipid components. Methods. From the Swedish Apolipoprotein Mortality Risk (AMORIS) study, we selected 540,309 participants (> 20 years old) with baseline measurements of total cholesterol (TC), triglycerides (TG), and glucose of whom 84,774 had baseline LDL cholesterol (LDL), HDL cholesterol (HDL), apolipoprotein B (apoB), and apolipoprotein A-I (apoA-I). Multivariate Cox proportional hazards regression was used to assess glucose and lipid components in relation to oesophageal, stomach, colon, and rectal cancer risk. Results. An increased risk of oesophageal cancer was observed in persons with high TG (e.g. HR: 2.29 (95% CI: 1.42–3.68) for the 4th quartile compared to the 1st) and low LDL, LDL/HDL ratio, TC/HDL ratio, log (TG/HDL), and apoB/apoA-I ratio. High glucose and TG were linked with an increased colon cancer risk, while high TC levels were associated with an increased rectal cancer risk. Conclusion. The persistent link between TC and rectal cancer risk as well as between TG and oesophageal and colon cancer risk in normoglycaemic individuals may imply their substantiality in gastrointestinal carcinogenesis.
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