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Yu J, Liang D, Li J, Liu Z, Zhou F, Wang T, Ma S, Wang G, Chen B, Chen W. Coffee, Green Tea Intake, and the Risk of Hepatocellular Carcinoma: A Systematic Review and Meta-Analysis of Observational Studies. Nutr Cancer 2023; 75:1295-1308. [PMID: 37038314 DOI: 10.1080/01635581.2023.2178949] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/12/2023]
Abstract
Several studies suggest an inverse relationship between coffee intake and risk of hepatocellular carcinoma (HCC), but the association between green tea intake and the risk of HCC is still inconclusive. We performed a meta-analysis of observational studies to clarify the association. We identified eligible studies published from January 1, 1992, to February 28, 2022, by searching PubMed, Web of Science, and EMBASE. A total of 32 studies were included in the meta-analysis. Among them, 21 studies involving 2,492,625 participants and 5980 cases of HCC reported coffee intake, 18 studies involving 1,481,647 participants and 6985 cases of HCC reported green tea intake, and seven studies reported both coffee intake and green tea intake. The results showed that a higher coffee (RR = 0.53; 95% CI: 0.47-0.59; I2 = 0.0%; Pheterogeneity = 0.634) or green tea (RR = 0.80; 95% CI: 0.67-0.95; I2 = 72.30%; Pheterogeneity < 0.001) intake may be associated with a lower risk of HCC. The same results were observed in both cohort and case-control subgroups. Our findings suggest that drinking coffee or green tea may be a potentially effective approach for the prevention or mitigation of HCC, but this still needs to be confirmed by further well-designed observational studies and clinical experimental research.
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Affiliation(s)
- Jinchuan Yu
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Di Liang
- Department of Nursing & Department of Gastroenterology, The First Affiliated Hospital of USTC, Division of Life Sciences and Medicine, University of Science and Technology of China, Hefei, Anhui, China
| | - Jiujiu Li
- Hefei Center for Disease Control and Prevention, Hefei, Anhui, China
| | - Zhengxiang Liu
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Fuding Zhou
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Ting Wang
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
| | - Shaodi Ma
- Department of Epidemiology and Health Statistics, School of Public Health, Anhui Medical University, Hefei, China
| | - Guangjun Wang
- School of Public Health, Anhui Medical University, Hefei, China
| | - Baochun Chen
- Department of Anhui, No.2 Provincial People' Hospital, Hefei, China
| | - Wenjun Chen
- Department of Nutrition and Food Hygiene, School of Public Health, Anhui Medical University, Hefei, China
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Li ZY, Tan YT, Liu DK, Gao LF, Li HL, Xiang YB. Cumulative consumption of tea is associated with lower risk of liver cancer: Updated results from the Shanghai Women's Health Study. Int J Cancer 2023; 152:1115-1123. [PMID: 36196488 PMCID: PMC9852019 DOI: 10.1002/ijc.34310] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/14/2022] [Revised: 09/06/2022] [Accepted: 09/27/2022] [Indexed: 01/22/2023]
Abstract
Prospective epidemiological studies have provided limited evidence for an association between tea consumption and liver cancer risk. Based on a population-based prospective cohort study in middle-aged Chinese women, we investigated the association between tea consumption and the risk of primary liver cancer. Detailed information on tea drinking habits and other potential confounders was obtained at the baseline interview. Incident liver cancer cases were identified through record linkage with the population-based cancer registry and verified through home visits and review of medical charts by medical experts. Multiple aspects of tea drinking habits including starting age, duration, intensity and cumulative consumption of any type of tea and green tea were considered. Multivariable-adjusted hazard ratios (aHRs) and their 95% confidence intervals (CIs) were derived from the Cox regression models. After a median follow-up time of 18.12 (interquartile range = 1.59) years, 253 incident liver cancer cases were identified from 71 841 cohort members. Compared with never tea drinkers, the risk of liver cancer for participants who have consumed over 30 kg of dried tea leaves cumulatively was 0.56 (95% CI: 0.32-0.97). For those who drank green tea only, the aHR was 0.54 (95% CI: 0.30-0.98). This updated study suggested an inverse association between cumulative consumption of tea, especially green tea and the risk of primary liver cancer.
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Affiliation(s)
- Zhuo-Ying Li
- School of Public Health, Fudan University, Shanghai 200032, China
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Yu-Ting Tan
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Da-Ke Liu
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Li-Feng Gao
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Hong-Lan Li
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
| | - Yong-Bing Xiang
- School of Public Health, Fudan University, Shanghai 200032, China
- State Key Laboratory of Oncogene and Related Genes & Department of Epidemiology, Shanghai Cancer Institute, Renji Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200032, China
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Li XX, Liu C, Dong SL, Ou CS, Lu JL, Ye JH, Liang YR, Zheng XQ. Anticarcinogenic potentials of tea catechins. Front Nutr 2022; 9:1060783. [PMID: 36545470 PMCID: PMC9760998 DOI: 10.3389/fnut.2022.1060783] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/03/2022] [Accepted: 11/21/2022] [Indexed: 12/07/2022] Open
Abstract
Catechins are a cluster of polyphenolic bioactive components in green tea. Anticarcinogenic effects of tea catechins have been reported since the 1980s, but it has been controversial. The present paper reviews the advances in studies on the anticarcinogenic activities of tea and catechins, including epidemiological evidence and anticarcinogenic mechanism. Tea catechins showed antagonistic effects on many cancers, such as gynecological cancers, digestive tract cancers, incident glioma, liver and gallbladder cancers, lung cancer, etc. The mechanism underlying the anticarcinogenic effects of catechins involves in inhibiting the proliferation and growth of cancer cells, scavenging free radicals, suppressing metastasis of cancer cells, improving immunity, interacting with other anticancer drugs, and regulating signaling pathways. The inconsistent results and their causes are also discussed in this paper.
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Affiliation(s)
- Xiao-Xiang Li
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Chang Liu
- Tea Science Society of China, Hangzhou, China
| | - Shu-Ling Dong
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Can-Song Ou
- Development Center of Liubao Tea Industry, Cangwu, China
| | - Jian-Liang Lu
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Jian-Hui Ye
- Tea Research Institute, Zhejiang University, Hangzhou, China
| | - Yue-Rong Liang
- Tea Research Institute, Zhejiang University, Hangzhou, China,*Correspondence: Yue-Rong Liang,
| | - Xin-Qiang Zheng
- Tea Research Institute, Zhejiang University, Hangzhou, China,Xin-Qiang Zheng,
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Li M, Duan Y, Wang Y, Chen L, Abdelrahim MEA, Yan J. The effect of Green green tea consumption on body mass index, lipoprotein, liver enzymes, and liver cancer: An updated systemic review incorporating a meta-analysis. Crit Rev Food Sci Nutr 2022; 64:1043-1051. [PMID: 36036958 DOI: 10.1080/10408398.2022.2113360] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
Abstract
INTRODUCTION Green tea is related to the reduction of liver enzymes, lipoprotein, and body mass index. However, some reports related green tea to the risk of developing liver cancer, but their outcomes were conflicting. Hence, the present study aimed to determine the relationship between green tea intake and lipoprotein, liver enzymes, body mass index, and liver cancer. METHODS A systematic literature search up to January 2022 was performed and 22 studies with a total of 169599 subjects participated in the studies with 97316 subjects of them used green tea intake. Odds ratio (OR) or standardized mean difference (MD) with 95% confidence intervals (CIs) was calculated to evaluate the relationship between green tea intake and lipoprotein, liver enzymes, body mass index, and liver cancer using the dichotomous or the contentious method with a random effect model. RESULTS Green tea intake significantly lowered the risk of developing liver cancer (OR, 0.85; 95% CI, 0.74 to 0.97, p = 0.02), and body mass index (MD, -0.69; 95% CI, -0.95to -0.42, p < 0.001) compared to no green tea intake. Also, there was a significant lowering effect of green tea intake on liver enzymes including alanine aminotransferase (MD, -0.65; 95% CI, -0.92 to -0.38, p < 0.001), and aspartate aminotransferase (MD, -0.77; 95% CI, -1.40 to -0.14, p = 0.02) compared to no green tea intake. There was also a significant lowering effect of green tea intake on lipoprotein including triglycerides (MD, -0.70; 95% CI, -1.35 to -0.04, p = 0.04), total cholesterol (MD, -0.39; 95% CI, -0.74 to -0.04, p = 0.03) and law-density lipoprotein (MD, -0.44; 95% CI, -0.69- -0.19, p < 0.001) compared to no green tea intake. However, no significant different was found between green tea intake and no green tea intake on high-density lipoprotein (MD, 0.16; 95% CI, -0.11 to 0.44, p = 0.24). CONCLUSIONS Based on this meta-analysis, green tea intake had a significant lowering effect on the risk of developing liver cancer and had a significantly improving effect on body mass index, liver enzymes, and lipoprotein compared to no green tea intake. These results suggest that green tea may be added to the daily dietary program to improve cardiovascular status with no possible risk of liver cancer. It even may have a protecting effect against liver cancer in the usual daily number of cups.
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Affiliation(s)
- Mingzhen Li
- Department of Health Management Center, Xiang'an Hospital of Xiamen University, Xiamen, China
| | - Yunjie Duan
- Department of Hepatobiliary Surgery, Shandong Provincial Hospital affiliated to Shandong University, Jinan, China
| | - Ying Wang
- Department of General Surgery, Xiang'an Hospital of Xiamen University, School of Medicine, Xiamen University, Xiamen, China
| | - Lei Chen
- Department of Emergency Medicine, Xiang'an Hospital of Xiamen University, Xiamen, Fujian, China
| | - Mohamed E A Abdelrahim
- Clinical Pharmacy Department, Faculty of Pharmacy, Beni-Suef University, Beni-Suef, Egypt
| | - Jun Yan
- Department of hepatological surgery, Three Gorges Hospital affiliated to Chongqing University, Chongqing, China
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Rojo MÁ, Garrosa M, Jiménez P, Girbés T, Garcia-Recio V, Cordoba-Diaz M, Cordoba-Diaz D. Unexpected Toxicity of Green Tea Polyphenols in Combination with the Sambucus RIL Ebulin. Toxins (Basel) 2020; 12:E542. [PMID: 32842591 PMCID: PMC7551510 DOI: 10.3390/toxins12090542] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2020] [Revised: 08/12/2020] [Accepted: 08/20/2020] [Indexed: 11/17/2022] Open
Abstract
The safety of concentrated food complements intake is a major health concern. It has been well established that green tea polyphenols (GTPs) consumption promotes healthy effects. However, the ingestion of large amounts of GTPs is a matter of controversy due to reported adverse effects. We underwent a preliminary exploration of the effects of the oral administration of a standardized concentrated GTPs preparation on mice which suffered from reversible intestinal derangement promoted by sublethal amounts of the antiribosomal lectin ebulin f from dwarf elder (Sambucus ebulus L.). Neither independent oral administration of 30 mg/kg body weight Polyphenon 60 nor intraperitoneal administration of 2.5 mg/kg body weight ebulin f triggered lethal toxicity. In contrast, the simultaneous administration of these same doses of both Polyphenon 60 and ebulin f triggered an important and unexpected synergistic toxic action featured by the biphasic reduction of weight, which continued after eight days, reaching a reduction of 40%. Lethality appeared 2 days after the onset of the combined treatment and reached more than 50% after 10 days.
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Affiliation(s)
- M. Ángeles Rojo
- Area of Experimental Sciences, Miguel de Cervantes European University, 47012 Valladolid, Spain;
| | - Manuel Garrosa
- Area of Histology, Faculty of Medicine and INCYL, University of Valladolid, 47005 Valladolid, Spain;
| | - Pilar Jiménez
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain; (P.J.); (T.G.)
| | - Tomás Girbés
- Area of Nutrition and Food Sciences, Faculty of Medicine, University of Valladolid, 47005 Valladolid, Spain; (P.J.); (T.G.)
| | - Verónica Garcia-Recio
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
| | - Manuel Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
- University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
| | - Damián Cordoba-Diaz
- Area of Pharmaceutics and Food Technology, Faculty of Pharmacy, Complutense University of Madrid, 28040 Madrid, Spain; (V.G.-R.); (M.C.-D.)
- University Institute of Industrial Pharmacy (IUFI), Complutense University of Madrid, 28040 Madrid, Spain
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Yu CX, Chen YS, Ge ZJ, Zhang YH, Xu X, Tian T, Wen Y, Zhu J, Song C, Chen JG, Hu ZB. Dietary habits and risk of hepatocellular carcinoma among hepatitis B surface antigen carriers: A prospective cohort study in China. J Dig Dis 2020; 21:406-415. [PMID: 32407579 DOI: 10.1111/1751-2980.12878] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/24/2020] [Revised: 04/29/2020] [Accepted: 05/11/2020] [Indexed: 12/11/2022]
Abstract
OBJECTIVE In this prospective cohort study, we aimed to evaluate the association between dietary habits and the risk of developing hepatocellular carcinoma (HCC) in hepatitis B surface antigen (HBsAg)-positive carriers in Qidong, an hepatitis B virus (HBV)-epidemic area in China. METHODS A total of 3199 HBsAg carriers aged 30-70 years in a prospective cohort in Qidong, China from 2007 to 2011 were included in the study. At baseline, all participants self-reported their dietary habits in a questionnaire interview. A follow-up check-up was performed every 6 months to identify HCC cases until November 2017. Cox's regression analysis and an interaction analysis were performed to estimate the relative risks of HCC in terms of baseline diet. RESULTS Among 3199 HBsAg-positive participants, 270 developed HCC (143.86/100 000 person-years [PYs]). Compared with participants who rarely consume garlic, the risk of HCC in those who consumed it ≥ once per week decreased along with the increase in frequency (HR = 1.00, 0.90 and 0.62 in those who consumed it rarely vs those who consumed it 1-6 times per week and ≥ 7 times per week, respectively). This study found a synergistic effect between garlic and tea consumption on the risk of HCC (P = 0.039 for a multiplicative interaction). CONCLUSIONS HBsAg carriers should improve their diet. Regular consumption of garlic and tea drinking may reduce the HCC incidence in HBsAg carriers.
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Affiliation(s)
- Cheng Xiao Yu
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yong Sheng Chen
- Qidong Liver Cancer Institute, Qidong People's Hospital, Affiliated Qidong Hospital of Nantong University, Qidong, Jiangsu Province, China
| | - Zi Jun Ge
- Department of Infection Management, Nanjing Medical University First Affiliated Hospital, Nanjing, Jiangsu Province, China
| | - Yong Hui Zhang
- Qidong Liver Cancer Institute, Qidong People's Hospital, Affiliated Qidong Hospital of Nantong University, Qidong, Jiangsu Province, China
| | - Xin Xu
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Ting Tian
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Yang Wen
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jian Zhu
- Qidong Liver Cancer Institute, Qidong People's Hospital, Affiliated Qidong Hospital of Nantong University, Qidong, Jiangsu Province, China
| | - Ci Song
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
| | - Jian Guo Chen
- Qidong Liver Cancer Institute, Qidong People's Hospital, Affiliated Qidong Hospital of Nantong University, Qidong, Jiangsu Province, China.,Affiliated Tumor Hospital/Institute, Nantong University, Nantong, Jiangsu Province, China
| | - Zhi Bin Hu
- Department of Epidemiology, Center for Global Health, School of Public Health, Nanjing Medical University, Nanjing, Jiangsu Province, China.,Jiangsu Key Lab of Cancer Biomarkers, Prevention and Treatment, Collaborative Innovation Center for Cancer Medicine, Nanjing Medical University, Nanjing, Jiangsu Province, China
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Filippini T, Malavolti M, Borrelli F, Izzo AA, Fairweather-Tait SJ, Horneber M, Vinceti M. Green tea (Camellia sinensis) for the prevention of cancer. Cochrane Database Syst Rev 2020; 3:CD005004. [PMID: 32118296 PMCID: PMC7059963 DOI: 10.1002/14651858.cd005004.pub3] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
BACKGROUND This review is an update of a previously published review in the Cochrane Database of Systematic Reviews (2009, Issue 3).Tea is one of the most commonly consumed beverages worldwide. Teas from the plant Camellia sinensis can be grouped into green, black and oolong tea, and drinking habits vary cross-culturally. C sinensis contains polyphenols, one subgroup being catechins. Catechins are powerful antioxidants, and laboratory studies have suggested that these compounds may inhibit cancer cell proliferation. Some experimental and nonexperimental epidemiological studies have suggested that green tea may have cancer-preventative effects. OBJECTIVES To assess possible associations between green tea consumption and the risk of cancer incidence and mortality as primary outcomes, and safety data and quality of life as secondary outcomes. SEARCH METHODS We searched eligible studies up to January 2019 in CENTRAL, MEDLINE, Embase, ClinicalTrials.gov, and reference lists of previous reviews and included studies. SELECTION CRITERIA We included all epidemiological studies, experimental (i.e. randomised controlled trials (RCTs)) and nonexperimental (non-randomised studies, i.e. observational studies with both cohort and case-control design) that investigated the association of green tea consumption with cancer risk or quality of life, or both. DATA COLLECTION AND ANALYSIS Two or more review authors independently applied the study criteria, extracted data and assessed methodological quality of studies. We summarised the results according to diagnosis of cancer type. MAIN RESULTS In this review update, we included in total 142 completed studies (11 experimental and 131 nonexperimental) and two ongoing studies. This is an additional 10 experimental and 85 nonexperimental studies from those included in the previous version of the review. Eleven experimental studies allocated a total of 1795 participants to either green tea extract or placebo, all demonstrating an overall high methodological quality based on 'Risk of bias' assessment. For incident prostate cancer, the summary risk ratio (RR) in the green tea-supplemented participants was 0.50 (95% confidence interval (CI) 0.18 to 1.36), based on three studies and involving 201 participants (low-certainty evidence). The summary RR for gynaecological cancer was 1.50 (95% CI 0.41 to 5.48; 2 studies, 1157 participants; low-certainty evidence). No evidence of effect of non-melanoma skin cancer emerged (summary RR 1.00, 95% CI 0.06 to 15.92; 1 study, 1075 participants; low-certainty evidence). In addition, adverse effects of green tea extract intake were reported, including gastrointestinal disorders, elevation of liver enzymes, and, more rarely, insomnia, raised blood pressure and skin/subcutaneous reactions. Consumption of green tea extracts induced a slight improvement in quality of life, compared with placebo, based on three experimental studies. In nonexperimental studies, we included over 1,100,000 participants from 46 cohort studies and 85 case-control studies, which were on average of intermediate to high methodological quality based on Newcastle-Ottawa Scale 'Risk of bias' assessment. When comparing the highest intake of green tea with the lowest, we found a lower overall cancer incidence (summary RR 0.83, 95% CI 0.65 to 1.07), based on three studies, involving 52,479 participants (low-certainty evidence). Conversely, we found no association between green tea consumption and cancer-related mortality (summary RR 0.99, 95% CI 0.91 to 1.07), based on eight studies and 504,366 participants (low-certainty evidence). For most of the site-specific cancers we observed a decreased RR in the highest category of green tea consumption compared with the lowest one. After stratifying the analysis according to study design, we found strongly conflicting results for some cancer sites: oesophageal, prostate and urinary tract cancer, and leukaemia showed an increased RR in cohort studies and a decreased RR or no difference in case-control studies. AUTHORS' CONCLUSIONS Overall, findings from experimental and nonexperimental epidemiological studies yielded inconsistent results, thus providing limited evidence for the beneficial effect of green tea consumption on the overall risk of cancer or on specific cancer sites. Some evidence of a beneficial effect of green tea at some cancer sites emerged from the RCTs and from case-control studies, but their methodological limitations, such as the low number and size of the studies, and the inconsistencies with the results of cohort studies, limit the interpretability of the RR estimates. The studies also indicated the occurrence of several side effects associated with high intakes of green tea. In addition, the majority of included studies were carried out in Asian populations characterised by a high intake of green tea, thus limiting the generalisability of the findings to other populations. Well conducted and adequately powered RCTs would be needed to draw conclusions on the possible beneficial effects of green tea consumption on cancer risk.
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Affiliation(s)
- Tommaso Filippini
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
| | - Marcella Malavolti
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
| | - Francesca Borrelli
- University of Naples 'Federico II', Department of Pharmacy, School of Medicine and Surgery, Via D Montesano 49, Naples, Italy, 80131
| | - Angelo A Izzo
- University of Naples 'Federico II', Department of Pharmacy, School of Medicine and Surgery, Via D Montesano 49, Naples, Italy, 80131
| | | | - Markus Horneber
- Paracelsus Medical University, Klinikum Nuremberg, Department of Internal Medicine, Division of Oncology and Hematology, Prof.-Ernst-Nathan-Str. 1, Nuremberg, Germany, D-90419
| | - Marco Vinceti
- University of Modena and Reggio Emilia, Research Center in Environmental, Nutritional and Genetic Epidemiology (CREAGEN), Department of Biomedical, Metabolic and Neural Sciences, Via Campi 287, Modena, Italy, 41125
- Boston University School of Public Health, Department of Epidemiology, 715 Albany Street, Boston, USA, MA 02118
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Tanaka K, Tamakoshi A, Sugawara Y, Mizoue T, Inoue M, Sawada N, Matsuo K, Ito H, Naito M, Nagata C, Kitamura Y, Sadakane A, Tsugane S, Shimazu T. Coffee, green tea and liver cancer risk: an evaluation based on a systematic review of epidemiologic evidence among the Japanese population. Jpn J Clin Oncol 2020; 49:972-984. [PMID: 31790152 DOI: 10.1093/jjco/hyz097] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/25/2019] [Revised: 06/07/2019] [Accepted: 06/11/2019] [Indexed: 12/19/2022] Open
Abstract
BACKGROUND Coffee and green tea, two popular drinks in the Japanese, have recently drawn much attention as potential protective factors against the occurrence of liver cancer. METHODS We systematically reviewed epidemiologic studies on coffee, green tea and liver cancer among Japanese populations. Original data were obtained by searching the MEDLINE (PubMed) and Ichushi databases, complemented with manual searches. The evaluation was performed in terms of the magnitude of association in each study and the strength of evidence ('convincing', 'probable', 'possible', or 'insufficient'), together with biological plausibility. RESULTS We identified four cohort and four case-control studies on coffee and liver cancer and six cohort and one case-control studies on green tea and liver cancer. All cohort and case-control studies on coffee reported a weak to strong inverse association, with a summary relative risk (RR) for one cup increase being 0.72 (95% confidence interval [CI] 0.66-0.79). Conversely, all studies but two cohort studies on green tea reported no association, with a corresponding summary RR of 0.99 (95% CI 0.97-1.01, P = 0.37). CONCLUSION Coffee drinking 'probably' decreases the risk of primary liver cancer among the Japanese population whereas the evidence on an association between green tea and liver cancer is 'insufficient' in this population.
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Affiliation(s)
- Keitaro Tanaka
- Department of Preventive Medicine, Faculty of Medicine, Saga University, Saga, Japan
| | - Akiko Tamakoshi
- Department of Public Health, Hokkaido University Graduate School of Medicine, Sapporo, Japan
| | - Yumi Sugawara
- Division of Epidemiology, Department of Health Informatics and Public Health, Tohoku University School of Public Health, Graduate School of Medicine, Sendai, Japan
| | - Tetsuya Mizoue
- Department of Epidemiology and Prevention, Center for Clinical Sciences, National Center for Global Health and Medicine, Tokyo, Japan
| | - Manami Inoue
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Norie Sawada
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Keitaro Matsuo
- Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Hidemi Ito
- Division of Epidemiology and Prevention, Aichi Cancer Center Research Institute, Nagoya, Japan
| | - Mariko Naito
- Department of Oral Epidemiology, Graduate School of Biomedical and Health Sciences, Hiroshima University, Hiroshima, Japan
| | - Chisato Nagata
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yuri Kitamura
- Department of Social and Environmental Medicine, Graduate School of Medicine, Osaka University, Osaka, Japan
| | - Atsuko Sadakane
- Department of Epidemiology, Radiation Effects Research Foundation, Hiroshima, Japan
| | - Shoichiro Tsugane
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
| | - Taichi Shimazu
- Epidemiology and Prevention Division, Research Center for Cancer Prevention and Screening, National Cancer Center, Tokyo, Japan
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In Vitro Analysis of Antioxidant, Anticancer, and Bioactive Components of Apocynum venetum Tea Extracts. J FOOD QUALITY 2019. [DOI: 10.1155/2019/2465341] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
The dry leaf of Apocynum venetum tea extracts (AVTEs) belonging to the Apocynaceae family is a traditional Chinese medicine. The aim of this study is to identify the bioactive components of AVTE and analyse its antioxidant and anticancer activity in vitro. Method. Flavones and polyphenols in AVTE were determined by high-performance liquid chromatography (HPLC) assay. The scavenging capacity of tea extracts to 1,1-diphenyl-2-picrylhydrazyl (DPPH); 2,2′-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) diammonium salt (ABTS); hydroxyl (OH); and superoxide anion-free radicals were investigated by spectrophotometry. We also detailed the cytotoxicity assay of AVTE (50, 100, and 200 μg/mL) to human embryonic kidney 293T cells, the protective effect of AVTE on 293T cells induced by hydrogen peroxide (0.3 mmol/L), and the anticancer effect against the human hepatoma HepG2 cells via 3-(4,5-dimethyl-2-thiazolyl)-2,5-diphenyl-2-H-tetrazolium bromide (MTT) assay. We investigated the antioxidative effects of AVTE in human embryonic kidney 293T cells and the anticancer mechanism in HepG2 human hepatoma cells via quantitative real-time reverse transcription-polymerase chain reaction (RT-qPCR) assay. Results. HPLC analysis showed that AVTEs contain neochlorogenic acid, chlorogenic acid, rutin, isoquercetin, isochlorogenic acid B, astragalin, isochlorogenic acid C, rosmarinic acid, quercetin, and trans-cinnamic acid. These extracts have high antioxidant activity and dose-dependent relation through free radical scavenging experiments. The cell viability of 293T cells treated with hydrogen peroxide (0.3 mmol/L) was significantly lower than that of normal cells, and the cell viability of oxidatively stressed 293T cells after AVTE (50, 100, and 200 μg/mL) treatment was significantly improved (P<0.05). Moreover, cytotoxicity experiments showed that the survival rate of 293T cells was over 90%, but the proliferation of HepG2 cells was significantly inhibited in a dose-dependent manner by AVTE. Furthermore, cytoprotective effects in 293T cells were induced via upregulation of glutathione peroxidase (GSH-Px), GSH, superoxide dismutase (SOD), and catalase (CAT) antioxidant-related factors, as well as apoptosis in HepG2 cells was induced via upregulation of caspase-3, caspase-9, p21, and p53 apoptosis-associated factors, as assessed via mRNA expression levels after treatment with AVTE, which were consistent with the results of antioxidant gene detections. As a conclusion, AVTE appears to be an effectively functional drink, due to its rich functional components and antioxidant and anticancer activities.
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10
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Maiti S, Nazmeen A, Medda N, Patra R, Ghosh TK. Flavonoids green tea against oxidant stress and inflammation with related human diseases. CLINICAL NUTRITION EXPERIMENTAL 2019. [DOI: 10.1016/j.yclnex.2018.12.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Tamura T, Wada K, Konishi K, Goto Y, Mizuta F, Koda S, Hori A, Tanabashi S, Matsushita S, Tokimitsu N, Nagata C. Coffee, Green Tea, and Caffeine Intake and Liver Cancer Risk: A Prospective Cohort Study. Nutr Cancer 2018; 70:1210-1216. [DOI: 10.1080/01635581.2018.1512638] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Takashi Tamura
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
- Department of Preventive Medicine, Nagoya University Graduate School of Medicine, Nagoya, Japan
| | - Keiko Wada
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Kie Konishi
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Yuko Goto
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Fumi Mizuta
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Sachi Koda
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
| | - Akihiro Hori
- Department of Surgery, Kumiai Kosei Hospital, Takayama, Japan
| | - Shinobu Tanabashi
- Department of Internal Medicine, Takayama Red Cross Hospital, Takayama, Japan
| | - Shogen Matsushita
- Department of Radiology, Takayama Red Cross Hospital, Takayama, Japan
| | - Naoki Tokimitsu
- Department of Internal Medicine, Takayama Red Cross Hospital, Takayama, Japan
| | - Chisato Nagata
- Department of Epidemiology and Preventive Medicine, Gifu University Graduate School of Medicine, Gifu, Japan
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12
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Bedrood Z, Rameshrad M, Hosseinzadeh H. Toxicological effects of Camellia sinensis (green tea): A review. Phytother Res 2018; 32:1163-1180. [PMID: 29575316 DOI: 10.1002/ptr.6063] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2017] [Revised: 01/14/2018] [Accepted: 01/26/2018] [Indexed: 12/21/2022]
Abstract
Many scientific articles proved that green tea (GT), Camellia sinensis, has a great potential to manage central nervous system, cardiovascular, and metabolic diseases and treat cancer and inflammatory disorders. However, it is important to consider that "natural" is not always "safe." Some relevant articles reported side effects of GT, detrimental effects on health. The aim of this study is to provide a classified report about the toxicity of GT and its main constituents in acute, subacute, subchronic, and chronic states. Furthermore, it discusses on the cytotoxicity, genotoxicity, mutagenicity, carcinogenicity, and developmental toxicity of GT and its main constituents. The most important side effects have been reported hepatotoxicity and gastrointestinal disorders specially while consumed on an empty stomach. GT and its main components are not major teratogen, mutagen, or carcinogen substances. However, there is limited data in using them during pregnancy, and they should be used with caution in pregnancy, breast-feeding, and susceptible people. Because GT and its main components have a wide variety of drug interactions, consideration should be taken in coadministration of them with narrow therapeutic indexed drugs. Furthermore, they evoke selective cytotoxicity on cancerous cells that could engage them as an adjuvant substance in cancer therapy.
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Affiliation(s)
- Zeinab Bedrood
- Department of Pharmacodynamy and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Maryam Rameshrad
- Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
| | - Hossein Hosseinzadeh
- Department of Pharmacodynamy and Toxicology, School of Pharmacy, Mashhad University of Medical Sciences, Mashhad, Iran.,Pharmaceutical Research Center, Pharmaceutical Technology Institute, Mashhad University of Medical Sciences, Mashhad, Iran
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13
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Phukan RK, Borkakoty BJ, Phukan SK, Bhandari K, Mahanta J, Tawsik S, Bhandari S, Rai A, Narain K. Association of processed food, synergistic effect of alcohol and HBV with Hepatocellular Carcinoma in a high incidence region of India. Cancer Epidemiol 2018; 53:35-41. [PMID: 29360624 DOI: 10.1016/j.canep.2018.01.005] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2017] [Revised: 01/02/2018] [Accepted: 01/07/2018] [Indexed: 02/07/2023]
Abstract
BACKGROUND Dietary factors, tobacco, and alcohol use have been identified as important factors of rising various cancer incidence in several northeastern states of India. However, little is known about the factors associated with hepatocellular carcinoma (HCC) in this region. The aim of the paper was to identify the factors associated with HCC in the northeast region. METHODS A case-control study was conducted in Arunachal Pradesh and Sikkim, two northeastern states of India, including 104 histologically-confirmed cases of HCC and same number (104) of age and sex matched control enrolled. Logistic regression analysis was performed to identify the factors associated with HCC. RESULTS A statistically significant association was demonstrated between HCC and alcohol consumption, consumption of 'Sai-mod' (OR 2.77, CI 1.57-4.87) a homemade alcohol beverage, and with HBV (OR 7.97, CI 3.36-18.94). Positive synergism index (S = 3.04) was observed between HBV and alcohol consumption to risk of HCC. Higher intake of processed meat (OR 2.56, CI 1.09-6.03) and processed fish (OR 2.24, CI 1.02-4.95) were found associated with increased risk of HCC; and decreased risk of HCC with fresh fish, fruits, and milk. CONCLUSIONS Strong relationship between different dietary factors, alcohol beverage with HCC suggests that control on dietary and drinking habit will be an important strategy to combat HCC in this region. Risk factors identified in this study will help to plan more effectively targeted risk reduction strategies and programs in this region.
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Affiliation(s)
- Rup Kumar Phukan
- ICMR - Regional Medical Research Centre (RMRC), N.E. Region, Post Box No. 105, Dibrugarh, 786 001, Assam, India.
| | - Biswa Jyoti Borkakoty
- ICMR - Regional Medical Research Centre (RMRC), N.E. Region, Post Box No. 105, Dibrugarh, 786 001, Assam, India.
| | - Sanjib Kumar Phukan
- ICMR - Regional Medical Research Centre (RMRC), N.E. Region, Post Box No. 105, Dibrugarh, 786 001, Assam, India.
| | - Kumar Bhandari
- Department of Health Care, Health Service and Family Welfare, Govt. of Sikkim, Sikkim, India.
| | - Jagdish Mahanta
- ICMR - Regional Medical Research Centre (RMRC), N.E. Region, Post Box No. 105, Dibrugarh, 786 001, Assam, India.
| | - Sopai Tawsik
- Tomo Riba State Hospital, Naharlagun, Arunachal Pradesh, India.
| | - Sangita Bhandari
- Sir Thodup Namgyal Memorial Hospital (STNM), Gangtok, 737 101, Sikkim, India.
| | - Ashish Rai
- Sir Thodup Namgyal Memorial Hospital (STNM), Gangtok, 737 101, Sikkim, India.
| | - Kanwar Narain
- ICMR - Regional Medical Research Centre (RMRC), N.E. Region, Post Box No. 105, Dibrugarh, 786 001, Assam, India.
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14
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Fu Y, Silverstein S, McCutcheon JN, Dyba M, Nath RG, Aggarwal M, Coia H, Bai A, Pan J, Jiang J, Kallakury B, Wang H, Zhang YW, Giaccone G, He AR, Chung FL. An endogenous DNA adduct as a prognostic biomarker for hepatocarcinogenesis and its prevention by Theaphenon E in mice. Hepatology 2018; 67:159-170. [PMID: 28718980 PMCID: PMC5912673 DOI: 10.1002/hep.29380] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 06/07/2017] [Accepted: 07/13/2017] [Indexed: 12/21/2022]
Abstract
UNLABELLED Hepatocellular carcinoma (HCC) is the third leading cause of cancer-related deaths worldwide, mainly because of its poor prognosis. A valid mechanism-based prognostic biomarker is urgently needed. γ-hydroxy-1,N2 -propanodeoxyguanosine (γ-OHPdG) is an endogenously formed mutagenic DNA adduct derived from lipid peroxidation. We examined the relationship of γ-OHPdG with hepatocarcinogenesis in two animal models and its potential role as a prognostic biomarker for recurrence in HCC patients. Bioassays were conducted in xeroderma pigmentosum group A knockout mice and diethylnitrosamine-injected mice, both prone to HCC development. γ-OHPdG levels in the livers of these animals were determined. The effects of antioxidant treatments on γ-OHPdG and hepatocarcinogenesis were examined. Using two independent sets of HCC specimens from patients, we examined the relationship between γ-OHPdG and survival or recurrence-free survival. γ-OHPdG levels in liver DNA showed an age-dependent increase and consistently correlated with HCC development in all three animal models. Theaphenon E treatment significantly decreased γ-OHPdG levels in the liver DNA of xeroderma pigmentosum group A knockout mice and remarkably reduced HCC incidence in these mice to 14% from 100% in the controls. It also effectively inhibited HCC development in the diethylnitrosamine-injected mice. Using clinical samples from two groups of patients, our study revealed that higher levels of γ-OHPdG are strongly associated with low survival (P < 0.0001) and low recurrence-free survival (P = 0.007). CONCLUSION These results support γ-OHPdG as a mechanism-based, biologically relevant biomarker for predicting the risk of HCC and its recurrence. (Hepatology 2018;67:159-170).
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Affiliation(s)
- Ying Fu
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA,To whom correspondence should be addressed. Dr. Fung-Lung Chung, Dept. of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, 3800 Reservoir Road, LL 128A, Box 571465, Washington, D. C. 20057. Tel.: 202-687-3021; Fax: 202-687-1068; . Dr. Ying Fu, Dept. of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, 3800 Reservoir Road, LL 128A, Box 571465, Washington, D. C. 20057. Tel.: 202-230-2320; Fax: 202-687-1068;
| | - Shana Silverstein
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Justine N. McCutcheon
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Marcin Dyba
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Raghu G. Nath
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Monika Aggarwal
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Heidi Coia
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Angela Bai
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Jishen Pan
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Jiji Jiang
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Bhaskar Kallakury
- Department of Pathology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Hongkun Wang
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Yu-Wen Zhang
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Giuseppe Giaccone
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Aiwu Ruth He
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA
| | - Fung-Lung Chung
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, DC 20057, USA,To whom correspondence should be addressed. Dr. Fung-Lung Chung, Dept. of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, 3800 Reservoir Road, LL 128A, Box 571465, Washington, D. C. 20057. Tel.: 202-687-3021; Fax: 202-687-1068; . Dr. Ying Fu, Dept. of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, 3800 Reservoir Road, LL 128A, Box 571465, Washington, D. C. 20057. Tel.: 202-230-2320; Fax: 202-687-1068;
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15
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A Review on Dietary and Non-Dietary Risk Factors Associated with Gastrointestinal Cancer. J Gastrointest Cancer 2017; 47:247-54. [PMID: 27270712 DOI: 10.1007/s12029-016-9845-1] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
INTRODUCTION Cancer is a complex disease involving neoplasm of abnormal cells leading to development of tumor cells. Gene mutations result in aberrant gene expression, which is the major cause observed in all the cancers. The GLOBOCAN 2012 reported the highest age-standardized rates for cancer of the colorectum followed by stomach, liver, and esophagus, which are gastrointestinal cancers, and the new cases also followed the same order across the globe. Various risk factors are associated with different types of cancer which can be classified as dietary and non-dietary risk factors. The dietary risk factors include diet, alcohol, and nutrient deficiencies, whereas the non-dietary risk factors of cancers are tobacco, lifestyle choices, certain infections, occupational exposures, and environmental factors. PURPOSE The aim of this review is to focus on the dietary and non-dietary risk factors linked to gastrointestinal cancers, which could be beneficial in clinical decision-making.
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16
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Ni CX, Gong H, Liu Y, Qi Y, Jiang CL, Zhang JP. Green Tea Consumption and the Risk of Liver Cancer: A Meta-Analysis. Nutr Cancer 2017; 69:211-220. [PMID: 28095030 DOI: 10.1080/01635581.2017.1263754] [Citation(s) in RCA: 42] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Green tea is a commonly consumed beverage in Asia and has been suggested to have anticarcinogenic properties. To date, epidemiological evidence of the effect of green tea consumption on liver cancer risk remains ambiguous. The aim of this meta-analysis is to evaluate the association between green tea consumption and the risk of liver cancer. The summary relative risk for the highest consumption (≥5 cups/day) of green tea on liver cancer incidence compared with nondrinkers was 0.62 (95% confidence interval: 0.49-0.79). We also found a trend that the incidence of liver cancer was reduced with the increasing years of green tea intake (significance at >20 yr). A significant dose-response association was found between green tea drinking and liver cancer risk. The downward trend was most obvious when the consumption of green tea increased up to about 4 cups/day. The results showed that the increasing green tea intake may have a preventive effect against liver cancer.
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Affiliation(s)
- Chen-Xu Ni
- a Department of Pharmacy , Shanghai Tenth People's Hospital, Tongji University School of Medicine , Shanghai , China.,b College of Pharmacy, Second Military Medical University , Shanghai , China
| | - Hong Gong
- c Laboratory of Stress Medicine , Faculty of Psychology and Mental Health, Second Military Medical University , Shanghai , China
| | - Ying Liu
- d Department of Pharmacy , Dongfang Hospital , Shanghai , China
| | - Yang Qi
- b College of Pharmacy, Second Military Medical University , Shanghai , China
| | - Chun-Lei Jiang
- c Laboratory of Stress Medicine , Faculty of Psychology and Mental Health, Second Military Medical University , Shanghai , China
| | - Jun-Ping Zhang
- b College of Pharmacy, Second Military Medical University , Shanghai , China
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17
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Epigallocatechin-3-Gallate Upregulates miR-221 to Inhibit Osteopontin-Dependent Hepatic Fibrosis. PLoS One 2016; 11:e0167435. [PMID: 27935974 PMCID: PMC5147893 DOI: 10.1371/journal.pone.0167435] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2016] [Accepted: 11/14/2016] [Indexed: 02/06/2023] Open
Abstract
Osteopontin (OPN) promotes hepatic fibrosis, and developing therapies targeting OPN expression in settings of hepatic injury holds promise. The polyphenol epigallocatechin-3-gallate (EGCG), found in high concentrations in green tea, downregulates OPN expression through OPN mRNA degradation, but the mechanism is unknown. Previous work has shown that microRNAs can decrease OPN mRNA levels, and other studies have shown that EGCG modulates the expression of multiple microRNAs. In our study, we first demonstrated that OPN induces hepatic stellate cells to transform into an activated state. We then identified three microRNAs which target OPN mRNA: miR-181a, miR-10b, and miR-221. In vitro results show that EGCG upregulates all three microRNAs, and all three microRNAs are capable of down regulating OPN mRNA when administered alone. Interestingly, only miR-221 is necessary for EGCG-mediated OPN mRNA degradation and miR-221 inhibition reduces the effects of EGCG on cell function. In vivo experiments show that thioacetamide (TAA)-induced cell cytotoxicity upregulates OPN expression; treatment with EGCG blocks the effects of TAA. Furthermore, chronic treatment of EGCG in vivo upregulates all three microRNAs equally, suggesting that in more chronic treatment all three microRNAs are involved in modulating OPN expression. We conclude that in in vitro and in vivo models of TAA-induced hepatic fibrosis, EGCG inhibits OPN-dependent injury and fibrosis. EGCG works primarily by upregulating miR-221 to accelerate OPN degradation. EGCG may therefore have utility as a protective agent in settings of liver injury.
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18
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Isomura T, Suzuki S, Origasa H, Hosono A, Suzuki M, Sawada T, Terao S, Muto Y, Koga T. Liver-related safety assessment of green tea extracts in humans: a systematic review of randomized controlled trials. Eur J Clin Nutr 2016; 70:1221-1229. [PMID: 27188915 PMCID: PMC5193539 DOI: 10.1038/ejcn.2016.78] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2015] [Revised: 03/07/2016] [Accepted: 03/11/2016] [Indexed: 12/15/2022]
Abstract
There remain liver-related safety concerns, regarding potential hepatotoxicity in humans, induced by green tea intake, despite being supposedly beneficial. Although many randomized controlled trials (RCTs) of green tea extracts have been reported in the literature, the systematic reviews published to date were only based on subjective assessment of case reports. To more objectively examine the liver-related safety of green tea intake, we conducted a systematic review of published RCTs. A systematic literature search was conducted using three databases (PubMed, EMBASE and Cochrane Central Register of Controlled Trials) in December 2013 to identify RCTs of green tea extracts. Data on liver-related adverse events, including laboratory test abnormalities, were abstracted from the identified articles. Methodological quality of RCTs was assessed. After excluding duplicates, 561 titles and abstracts and 119 full-text articles were screened, and finally 34 trials were identified. Of these, liver-related adverse events were reported in four trials; these adverse events involved seven subjects (eight events) in the green tea intervention group and one subject (one event) in the control group. The summary odds ratio, estimated using a meta-analysis method for sparse event data, for intervention compared with placebo was 2.1 (95% confidence interval: 0.5-9.8). The few events reported in both groups were elevations of liver enzymes. Most were mild, and no serious liver-related adverse events were reported. Results of this review, although not conclusive, suggest that liver-related adverse events after intake of green tea extracts are expected to be rare.
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Affiliation(s)
- T Isomura
- Clinical Study Support Inc.,
Nagoya, Japan
- Institute of Medical Science, Tokyo
Medical University, Tokyo, Japan
- Department of Public Health, Nagoya City
University Graduate School of Medical Sciences, Nagoya,
Japan
- Division of Biostatistics and Clinical
Epidemiology, University of Toyama Graduate School of Medicine and Pharmaceutical
Sciences, Toyama, Japan
| | - S Suzuki
- Department of Public Health, Nagoya City
University Graduate School of Medical Sciences, Nagoya,
Japan
| | - H Origasa
- Division of Biostatistics and Clinical
Epidemiology, University of Toyama Graduate School of Medicine and Pharmaceutical
Sciences, Toyama, Japan
| | - A Hosono
- Department of Public Health, Nagoya City
University Graduate School of Medical Sciences, Nagoya,
Japan
| | - M Suzuki
- Clinical Study Support Inc.,
Nagoya, Japan
| | - T Sawada
- Clinical Study Support Inc.,
Nagoya, Japan
| | - S Terao
- Clinical Study Support Inc.,
Nagoya, Japan
| | - Y Muto
- Clinical Study Support Inc.,
Nagoya, Japan
| | - T Koga
- Clinical Study Support Inc.,
Nagoya, Japan
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19
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The Anti-Cancer Effect of Polyphenols against Breast Cancer and Cancer Stem Cells: Molecular Mechanisms. Nutrients 2016; 8:nu8090581. [PMID: 27657126 PMCID: PMC5037565 DOI: 10.3390/nu8090581] [Citation(s) in RCA: 99] [Impact Index Per Article: 12.4] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2016] [Revised: 08/25/2016] [Accepted: 09/09/2016] [Indexed: 02/07/2023] Open
Abstract
The high incidence of breast cancer in developed and developing countries, and its correlation to cancer-related deaths, has prompted concerned scientists to discover novel alternatives to deal with this challenge. In this review, we will provide a brief overview of polyphenol structures and classifications, as well as on the carcinogenic process. The biology of breast cancer cells will also be discussed. The molecular mechanisms involved in the anti-cancer activities of numerous polyphenols, against a wide range of breast cancer cells, in vitro and in vivo, will be explained in detail. The interplay between autophagy and apoptosis in the anti-cancer activity of polyphenols will also be highlighted. In addition, the potential of polyphenols to target cancer stem cells (CSCs) via various mechanisms will be explained. Recently, the use of natural products as chemotherapeutics and chemopreventive drugs to overcome the side effects and resistance that arise from using chemical-based agents has garnered the attention of the scientific community. Polyphenol research is considered a promising field in the treatment and prevention of breast cancer.
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20
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Fujioka K, Iwamoto T, Shima H, Tomaru K, Saito H, Ohtsuka M, Yoshidome A, Kawamura Y, Manome Y. The Powdering Process with a Set of Ceramic Mills for Green Tea Promoted Catechin Extraction and the ROS Inhibition Effect. Molecules 2016; 21:474. [PMID: 27077834 PMCID: PMC6273883 DOI: 10.3390/molecules21040474] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2016] [Revised: 03/22/2016] [Accepted: 04/01/2016] [Indexed: 01/03/2023] Open
Abstract
For serving green tea, there are two prominent methods: steeping the leaf or the powdered leaf (matcha style) in hot water. The purpose of the present study was to reveal chemical and functional differences before and after the powdering process of green tea leaf, since powdered green tea may contribute to expanding the functionality because of the different ingesting style. In this study, we revealed that the powdering process with a ceramic mill and stirring in hot water increased the average extracted concentration of epigallocatechin gallate (EGCG) by more than three times compared with that in leaf tea using high-performance liquid chromatography (HPLC) and liquid chromatography-tandem mass Spectrometry (LC-MS/MS) analyses. Moreover, powdered green tea has a higher inhibition effect of reactive oxygen species (ROS) production in vitro compared with the same amount of leaf tea. Our data suggest that powdered green tea might have a different function from leaf tea due to the higher catechin contents and particles.
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Affiliation(s)
- Kouki Fujioka
- Division of Molecular Cell Biology, Core Research Facilities for Basic Science, The Jikei University School of Medicine, Tokyo 105-8461, Japan.
| | - Takeo Iwamoto
- Division of Molecular Cell Biology, Core Research Facilities for Basic Science, The Jikei University School of Medicine, Tokyo 105-8461, Japan.
| | - Hidekazu Shima
- Health and Environment Systems Division, Consumer Electronics Company, Sharp Corporation, Osaka 581-8585, Japan.
| | - Keiko Tomaru
- Division of Molecular Cell Biology, Core Research Facilities for Basic Science, The Jikei University School of Medicine, Tokyo 105-8461, Japan.
| | - Hideki Saito
- Division of Molecular Cell Biology, Core Research Facilities for Basic Science, The Jikei University School of Medicine, Tokyo 105-8461, Japan.
| | - Masaki Ohtsuka
- Health and Environment Systems Division, Consumer Electronics Company, Sharp Corporation, Osaka 581-8585, Japan.
| | - Akihiro Yoshidome
- Health and Environment Systems Division, Consumer Electronics Company, Sharp Corporation, Osaka 581-8585, Japan.
| | - Yuri Kawamura
- Health and Environment Systems Division, Consumer Electronics Company, Sharp Corporation, Osaka 581-8585, Japan.
| | - Yoshinobu Manome
- Division of Molecular Cell Biology, Core Research Facilities for Basic Science, The Jikei University School of Medicine, Tokyo 105-8461, Japan.
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21
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Lewandowska U, Fichna J, Gorlach S. Enhancement of anticancer potential of polyphenols by covalent modifications. Biochem Pharmacol 2016; 109:1-13. [PMID: 26776305 DOI: 10.1016/j.bcp.2015.12.019] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2015] [Accepted: 12/23/2015] [Indexed: 12/23/2022]
Abstract
As evidenced by a growing number of respective clinical trials, a promising and increasingly valued approach to cancer prevention is chemoprevention which is based on using synthetic, semisynthetic, or natural compounds with the aim of preventing, delaying, arresting, or reversing carcinogenesis. Research carried out in the last two decades indicates that natural polyphenols isolated from plants (as well as their derivatives and synthetic analogs) exhibit pleiotropic actions toward cancer cells and therefore they could be used in both cancer prevention and therapy. This review discusses selected covalent modifications of polyphenols as a means for increasing their anticancer potential in relation to the parent compounds. The modifications include hydroxylation, methylation, acylation, and galloylation, among others. They were demonstrated to enhance cytotoxic, pro-oxidant, antiproliferative, proapoptotic, proautophagic, and antimigratory activities of phenolics toward various cancer cell lines in vitro. Importantly, some derivatives proved to suppress tumor growth and metastasis in animal models more strongly than the parent compounds. Some of the above-mentioned covalent modifications were also shown to increase absorption and tissue distribution of tested phenolic compounds in vivo. Anticancer clinical trials with polyphenol derivatives therefore seem warranted.
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Affiliation(s)
| | - Jakub Fichna
- Department of Biochemistry, Medical University of Lodz, Lodz, Poland
| | - Sylwia Gorlach
- Department of Biochemistry, Medical University of Lodz, Lodz, Poland
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Forester SC, Lambert JD. The catechol- O-methyltransferase inhibitor, tolcapone, increases the bioavailability of unmethylated (-)-epigallocatechin-3-gallate in mice. J Funct Foods 2015; 17:183-188. [PMID: 26213577 PMCID: PMC4509505 DOI: 10.1016/j.jff.2015.05.012] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023] Open
Abstract
(-)-Epigallocatechin-3-gallate (EGCG), has been shown to inhibit cancer in vivo. EGCG, however, is rapidly methylated by catechol-O-methyl transferase (COMT), which reduces its cancer preventive efficacy. Tolcapone (TOL), is a clinically-used COMT inhibitor. Here, we examined the effect of TOL on the bioavailability of EGCG in male CF-1 mice. Plasma and tissue levels of EGCG and its methyl metabolites were determined following intragastric administration of EGCG (100 mg/kg), TOL (30 mg/kg), or the combination. In mice treated with EGCG, unmethylated plasma EGCG accounted for 63.4 % of the total. Co-administration of TOL increased this fraction to 87.9 %. In the urine, unmethylated EGCG accounted for 29.2 % of the total, whereas treatment with EGCG plus TOL increased this to 81.8 %. Similar effects were observed in the major organs examined. TOL effectively inhibited the methylation of EGCG in vivo. Future studies should examine the cancer preventive effects of the combination.
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Affiliation(s)
- Sarah C. Forester
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
| | - Joshua D. Lambert
- Department of Food Science, The Pennsylvania State University, University Park, PA, USA
- Center for Molecular Toxicology and Carcinogenesis, The Pennsylvania State University, University Park, PA, USA
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Huang YQ, Lu X, Min H, Wu QQ, Shi XT, Bian KQ, Zou XP. Green tea and liver cancer risk: A meta-analysis of prospective cohort studies in Asian populations. Nutrition 2015; 32:3-8. [PMID: 26412579 DOI: 10.1016/j.nut.2015.05.021] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 05/13/2015] [Accepted: 05/20/2015] [Indexed: 12/12/2022]
Abstract
OBJECTIVES The aim of this meta-analysis was to investigate whether an association existed between green tea consumption and the risk for liver cancer in prospective cohort studies in Asian populations. METHODS Relevant studies were identified by searching PubMed, EMBASE, ISI Web of Science, and the Chinese Bio-medicine Database published before April 2015. Study-specific risk estimates for the highest versus non- or lowest and increment of daily cup of green tea consumption levels were combined based on fixed- or random-effects models. STATA 11.0 (Stata Corporation, College Station, TX, USA) software was used for statistical analysis. RESULTS Nine prospective cohort articles involving 465,274 participants and 3694 cases of liver cancer from China, Japan, and Singapore were included. The summary relative risk (RR) indicated a significant association between the highest green tea consumption and reduced risk for liver cancer (summary RR, 0.88; 95% confidence interval [CI], 0.81-0.97). However, no statistically significant association was observed when analyzing daily consumption of one cup (summary RR, 0.97; 95% CI, 0.95-1.00). When stratified by sex, the protective effect of green tea consumption on risk for liver cancer was observed only in the group of women (summary RR, 0.78; 95% CI, 0.64-0.96), but not in men (summary RR, 0.89; 95% CI, 0.79-1.00). CONCLUSIONS The present analysis indicated the preventive effects of green tea intake on the risk for liver cancer in female Asian populations. However, additional studies are needed to make a convincing case for this association.
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Affiliation(s)
- Ya-Qing Huang
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Xin Lu
- Department of Cardiology, The First Affiliated Hospital of Nanjing Medical University, Nanjing, China
| | - Han Min
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Qian-Qian Wu
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Xiao-Ting Shi
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Kang-Qi Bian
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China
| | - Xiao-Ping Zou
- Department of Gastroenterology, Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing, China.
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Bamia C, Lagiou P, Jenab M, Trichopoulou A, Fedirko V, Aleksandrova K, Pischon T, Overvad K, Olsen A, TjØnneland A, Boutron-ruault MC, Fagherazzi G, Racine A, Kuhn T, Boeing H, Floegel A, Benetou V, Palli D, Grioni S, Panico S, Tumino R, Vineis P, Bueno-de-mesquita H, Dik VK, Bhoo-Pathy N, Uiterwaal CSPM, Weiderpass E, Lund E, Quirós J, Zamora-ros R, Molina-Montes E, Chirlaque MD, Ardanaz E, Dorronsoro M, Lindkvist B, Wallström P, Nilsson LM, Sund M, Khaw KT, Wareham N, Bradbury KE, Travis RC, Ferrari P, Duarte-salles T, Stepien M, Gunter M, Murphy N, Riboli E, Trichopoulos D. Coffee, tea and decaffeinated coffee in relation to hepatocellular carcinoma in a European population: multicentre, prospective cohort study. Int J Cancer 2015; 136:1899-908. [PMID: 25219573 PMCID: PMC6284785 DOI: 10.1002/ijc.29214] [Citation(s) in RCA: 58] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/09/2014] [Revised: 08/05/2014] [Accepted: 08/20/2014] [Indexed: 12/29/2022]
Abstract
Inverse associations of coffee and/or tea in relation to hepatocellular carcinoma (HCC) risk have been consistently identified in studies conducted mostly in Asia where consumption patterns of such beverages differ from Europe. In the European Prospective Investigation into Cancer and nutrition (EPIC), we identified 201 HCC cases among 486,799 men/women, after a median follow-up of 11 years. We calculated adjusted hazard ratios (HRs) for HCC incidence in relation to quintiles/categories of coffee/tea intakes. We found that increased coffee and tea intakes were consistently associated with lower HCC risk. The inverse associations were substantial, monotonic and statistically significant. Coffee consumers in the highest compared to the lowest quintile had lower HCC risk by 72% [HR: 0.28; 95% confidence intervals (CIs): 0.16-0.50, p-trend < 0.001]. The corresponding association of tea with HCC risk was 0.41 (95% CI: 0.22-0.78, p-trend = 0.003). There was no compelling evidence of heterogeneity of these associations across strata of important HCC risk factors, including hepatitis B or hepatitis C status (available in a nested case-control study). The inverse, monotonic associations of coffee intake with HCC were apparent for caffeinated (p-trend = 0.009), but not decaffeinated (p-trend = 0.45) coffee for which, however, data were available for a fraction of subjects. Results from this multicentre, European cohort study strengthen the existing evidence regarding the inverse association between coffee/tea and HCC risk. Given the apparent lack of heterogeneity of these associations by HCC risk factors and that coffee/tea are universal exposures, our results could have important implications for high HCC risk subjects.
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Affiliation(s)
- Christina Bamia
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, 115 27 Athens, Greece
| | - Pagona Lagiou
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, 115 27 Athens, Greece
- Bureau of Epidemiologic Research, Academy of Athens, 115 27 Athens, Greece
- Department of Epidemiology, Harvard School of Public Health, MA, 02115 Boston, USA
| | - Mazda Jenab
- International Agency for Research on Cancer (IARC-WHO), 69372 Lyon, France
| | - Antonia Trichopoulou
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, 115 27 Athens, Greece
- Hellenic Health Foundation, 115 27, Athens, Greece
| | - Veronika Fedirko
- International Agency for Research on Cancer (IARC-WHO), 69372 Lyon, France
- Department of Epidemiology, Rollins School of Public Health, Winship Cancer Institute, Emory University, 30322, Atlanta GA, USA
| | - Krasimira Aleksandrova
- Department of Epidemiology, German Institute of Human Nutrition, Potsdam-Rehbruecke, 14558 Nuthetal, Germany
| | - Tobias Pischon
- Department of Epidemiology, German Institute of Human Nutrition, Potsdam-Rehbruecke, 14558 Nuthetal, Germany
- Molecular Epidemiology Group, Max Delbrück Center for Molecular Medicine (MDC) Berlin-Buch, D-13125 Berlin, Germany
| | - Kim Overvad
- Department of Epidemiology, School of Public Health, Aarhus University, DK-8000 Aarhus, Denmark
| | - Anja Olsen
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark
| | - Anne TjØnneland
- Danish Cancer Society Research Center, DK-2100 Copenhagen, Denmark
| | - Marie-Christine Boutron-ruault
- Inserm, Centre for Research in Epidemiology and Population Health, U1018, Institut Gustave Roussy, F-94805, Villejuif, Paris, France
- Paris South University, UMRS 1018, F-94805, Villejuif, Paris, France
- IGR, F-94805, Villejuif, Paris, France
| | - Guy Fagherazzi
- Inserm, Centre for Research in Epidemiology and Population Health, U1018, Institut Gustave Roussy, F-94805, Villejuif, Paris, France
- Paris South University, UMRS 1018, F-94805, Villejuif, Paris, France
- IGR, F-94805, Villejuif, Paris, France
| | - Antoine Racine
- Inserm, Centre for Research in Epidemiology and Population Health, U1018, Institut Gustave Roussy, F-94805, Villejuif, Paris, France
- Paris South University, UMRS 1018, F-94805, Villejuif, Paris, France
- IGR, F-94805, Villejuif, Paris, France
| | - Tilman Kuhn
- German Cancer Research Center (DKFZ), 69120 Heidelberg, Germany
| | - Heiner Boeing
- Department of Epidemiology, German Institute of Human Nutrition, Potsdam-Rehbruecke, 14558 Nuthetal, Germany
| | - Anna Floegel
- Department of Epidemiology, German Institute of Human Nutrition, Potsdam-Rehbruecke, 14558 Nuthetal, Germany
| | - Vasiliki Benetou
- Department of Hygiene, Epidemiology and Medical Statistics, University of Athens Medical School, 115 27 Athens, Greece
- Hellenic Health Foundation, 115 27, Athens, Greece
| | - Domenico Palli
- Molecular and Nutritional Epidemiology Unit, Cancer Research and Prevention Institute – ISPO, 50139 Florence, Italy
| | - Sara Grioni
- Epidemiology and Prevention Unit, Fondazione IRCCS Istituto Nazionale dei Tumori, 20133 Milan, Italy
| | - Salvatore Panico
- Department of clinical and experimental medicine, Federico II University, 80131 Naples, Italy
| | - Rosario Tumino
- Cancer Registry and Histopathology Unit, "Civic - M.P.Arezzo" Hospital, ASP 97100 Ragusa, Italy
| | - Paolo Vineis
- HuGeF - Human Genetics Foundation, 10126 Torino, Italy
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College, W2 1NY London, UK
| | - H.B(as) Bueno-de-mesquita
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College, W2 1NY London, UK
- National Institute for Public Health and the Environment (RIVM), 3720 BA Bilthoven, The Netherlands
- Department of Gastroenterology and Hepatology, University Medical Centre Utrecht, 3508 GA Utrecht, The Netherlands
| | - Vincent K. Dik
- Department of Gastroenterology and Hepatology, University Medical Centre Utrecht, 3508 GA Utrecht, The Netherlands
| | - Nirmala Bhoo-Pathy
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, 3508 GA, Utrecht, The Netherlands
- Julius Centre, Faculty of Medicine, University of Malaya, 50603 Lembah Pantai, Kuala Lumpur, Malaysia
| | - Cuno SPM Uiterwaal
- Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, 3508 GA, Utrecht, The Netherlands
| | - Elisabete Weiderpass
- Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
- Department of Research, Cancer Registry of Norway, NO-0304 Oslo, Norway
- Department of Medical Epidemiology and Biostatistics, Karolinska Institutet, SE - 17177 Stockholm, Sweden
- Samfundet Folkhälsan, Helsinki, 00250 Finland
| | - Eiliv Lund
- Department of Community Medicine, Faculty of Health Sciences, UiT The Arctic University of Norway, N-9037 Tromsø, Norway
| | | | - Raul Zamora-ros
- International Agency for Research on Cancer (IARC-WHO), 69372 Lyon, France
- Unit of Nutrition, Environment and Cancer, Catalan Institute of Oncology (ICO), Bellvitge Biomedical Research Institute (IDIBELL), 08907 Barcelona, Spain
| | - Esther Molina-Montes
- Andalusian School of Public Health, 18080 Granada, Spain
- Instituto de Investigación Biosanitario de Granada (Granada.bs), 18001 Granada, Spain
- CIBER Epidemiology and Public Health CIBERESP, 28029 Madrid, Spain
| | - Maria-Dolores Chirlaque
- CIBER Epidemiology and Public Health CIBERESP, 28029 Madrid, Spain
- Epidemiology Department, Murcia Regional Health Council, 30008 Murcia, Spain
| | - Eva Ardanaz
- CIBER Epidemiology and Public Health CIBERESP, 28029 Madrid, Spain
- Navarre Public Health Institute, 31003 Pamplona, Spain
| | - Miren Dorronsoro
- Public Health Direction, Basque Regional Health Department, 4-20013 Donostia, San Sebastian, Spain
- Biodonostia Research Institute CIBER Epidemiology and Public Health CIBERESP, s/n 20014 San Sebastian, Spain
| | - Björn Lindkvist
- Institute of Medicine, Sahlgrenska Academy, University of Gothenburg SE-40530 Gothenburg, Sweden
| | - Peter Wallström
- Nutrition Epidemiology Research Group, Dept. of Clinical Sciences, Lund University, SE-20502 Malmö, Sweden
| | - Lena Maria Nilsson
- Public health and clinical medicine, Nutritional research, Umeå University, SE-90185 Umeå, Sweden
- Arcum, Arctic Research Centre at Umeå University, SE-90185 Umeå, Sweden
| | - Malin Sund
- Experimental Surgery, Department of Surgical and Perioperative Sciences/Surgery, Umea University, SE-90185 Umea, Sweden
| | | | - Nick Wareham
- University of Cambridge, CB2 0SR Cambridge, UK
- MRC Epidemiology Unit, CB2 0QQ Cambridge, UK
| | - Kathryn E Bradbury
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK
| | - Ruth C Travis
- Cancer Epidemiology Unit, Nuffield Department of Population Health, University of Oxford, Oxford OX3 7LF, UK
| | - Pietro Ferrari
- International Agency for Research on Cancer (IARC-WHO), 69372 Lyon, France
| | | | - Magdalena Stepien
- International Agency for Research on Cancer (IARC-WHO), 69372 Lyon, France
| | - Marc Gunter
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College, W2 1NY London, UK
| | - Neil Murphy
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College, W2 1NY London, UK
| | - Elio Riboli
- Department of Epidemiology and Biostatistics, School of Public Health, Faculty of Medicine, Imperial College, W2 1NY London, UK
| | - Dimitrios Trichopoulos
- Bureau of Epidemiologic Research, Academy of Athens, 115 27 Athens, Greece
- Department of Epidemiology, Harvard School of Public Health, MA, 02115 Boston, USA
- Hellenic Health Foundation, 115 27, Athens, Greece
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Tea and coffee consumption and risk of laryngeal cancer: a systematic review meta-analysis. PLoS One 2014; 9:e112006. [PMID: 25502726 PMCID: PMC4264690 DOI: 10.1371/journal.pone.0112006] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2013] [Accepted: 10/11/2014] [Indexed: 11/20/2022] Open
Abstract
Background Tea and coffee are the most commonly consumed beverages in the worldwide. The relationship between tea and coffee consumption on the risk of laryngeal cancer was still unclear. Methods Relevant studies were identified by searching electronic database (Medline and EMBASE) and reviewing the reference lists of relevant articles until Oct. 2013. Observational studies that reported RRs and 95% CIs for the link of tea and coffee consumption on the risk of laryngeal cancer were eligible. A meta-analysis was obtained to combine study-specific RRs with a random-effects model. Results A total of 2,803 cases and 503,234 controls in 10 independent studies were identified. The overall analysis of all 10 studies, including the case-control and cohort studies, found that tea drinking was not associated with laryngeal carcinoma (RR = 1.03; 95% CI: 0.66–1.61). However, coffee consumption was significantly associated with the laryngeal carcinoma (RR = 1.47; 95% CI: 1.03–2.11). A dose-response relationship between coffee intake and laryngeal carcinoma was detected; however, no evidence of dose-response link between tea consumption and laryngeal carcinoma risk was detected. Conclusions The results from this meta-analysis of observational studies demonstrate that coffee consumption would increase the laryngeal cancer risk, while tea intake was not associated with risk of laryngeal carcinoma.
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Fu Y, Nath RG, Dyba M, Cruz IM, Pondicherry SR, Fernandez A, Schultz CL, Yang P, Pan J, Desai D, Krzeminski J, Amin S, Christov PP, Hara Y, Chung FL. In vivo detection of a novel endogenous etheno-DNA adduct derived from arachidonic acid and the effects of antioxidants on its formation. Free Radic Biol Med 2014; 73:12-20. [PMID: 24816294 PMCID: PMC4114339 DOI: 10.1016/j.freeradbiomed.2014.04.032] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/19/2014] [Revised: 04/28/2014] [Accepted: 04/29/2014] [Indexed: 02/07/2023]
Abstract
Previous studies showed that 7-(1',2'-dihydroxyheptyl)-substituted etheno DNA adducts are products of reactions with the epoxide of (E)-4-hydroxy-2-nonenal, an oxidation product of ω-6 polyunsaturated fatty acids (PUFAs). In this work, we report the detection of 7-(1',2'-dihydroxyheptyl)-1,N(6)-ethenodeoxyadenosine (DHHedA) in rodent and human tissues by two independent methods: a (32)P-postlabeling/HPLC method and an isotope dilution liquid chromatography-electrospray ionization-tandem mass spectrometry method, demonstrating for the first time that DHHedA is a background DNA lesion in vivo. We showed that DHHedA can be formed upon incubation of arachidonic acid with deoxyadenosine, supporting the notion that ω-6 PUFAs are the endogenous source of DHHedA formation. Because cyclic adducts are derived from the oxidation of PUFAs, we subsequently examined the effects of antioxidants, α-lipoic acid, Polyphenon E, and vitamin E, on the formation of DHHedA and γ-hydroxy-1,N(2)-propanodeoxyguanosine (γ-OHPdG), a widely studied acrolein-derived adduct arising from oxidized PUFAs, in the livers of Long Evans Cinnamon (LEC) rats. LEC rats are afflicted with elevated lipid peroxidation and prone to the development of hepatocellular carcinomas. The results showed that although the survival of LEC rats was increased significantly by α-lipoic acid, none of the antioxidants inhibited the formation of DHHedA, and only Polyphenon E decreased the formation of γ-OHPdG. In contrast, vitamin E caused a significant increase in the formation of both γ-OHPdG and DHHedA in the livers of LEC rats.
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Affiliation(s)
- Ying Fu
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Raghu G Nath
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Marcin Dyba
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Idalia M Cruz
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Sharanya R Pondicherry
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Aileen Fernandez
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Casey L Schultz
- Department of Experimental Therapeutics, University of Texas, MD Anderson Cancer Center, Houston, Texas 77054
| | - Peiying Yang
- Department of Experimental Therapeutics, University of Texas, MD Anderson Cancer Center, Houston, Texas 77054
| | - Jishen Pan
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
| | - Dhimant Desai
- Department of Pharmacology, Penn State College of Medicine, Hershey, Pennsylvania 17033
| | - Jacek Krzeminski
- Department of Pharmacology, Penn State College of Medicine, Hershey, Pennsylvania 17033
| | - Shantu Amin
- Department of Pharmacology, Penn State College of Medicine, Hershey, Pennsylvania 17033
| | - Plamen P Christov
- Department of Chemistry, Vanderbilt University, VU Station B 351822, Nashville, TN 37235
| | | | - Fung-Lung Chung
- Department of Oncology, Lombardi Comprehensive Cancer Center, Georgetown University, Washington, District of Columbia 20057
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Yu F, Jin Z, Jiang H, Xiang C, Tang J, Li T, He J. Tea consumption and the risk of five major cancers: a dose-response meta-analysis of prospective studies. BMC Cancer 2014; 14:197. [PMID: 24636229 PMCID: PMC4004325 DOI: 10.1186/1471-2407-14-197] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2013] [Accepted: 03/11/2014] [Indexed: 12/14/2022] Open
Abstract
Background We conducted a dose–response meta-analysis of prospective studies to summarize evidence of the association between tea consumption and the risk of breast, colorectal, liver, prostate, and stomach cancer. Methods We searched PubMed and two other databases. Prospective studies that reported risk ratios (RRs) with 95% confidence intervals (CIs) of cancer risk for ≥3 categories of tea consumption were included. We estimated an overall RR with 95% CI for an increase of three cups/day of tea consumption, and, usingrestricted cubic splines, we examined a nonlinear association between tea consumption and cancer risk. Results Forty-one prospective studies, with a total of 3,027,702 participants and 49,103 cancer cases, were included. From the pooled overall RRs, no inverse association between tea consumption and risk of five major cancers was observed. However, subgroup analysis showed that increase in consumption of three cups of black tea per day was a significant risk factor for breast cancer (RR, 1.18; 95% CI, 1.05-1.32). Conclusion Ourresults did not show a protective role of tea in five major cancers. Additional large prospective cohort studies are needed to make a convincing case for associations.
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Affiliation(s)
| | | | | | | | | | | | - Jia He
- Department of Health Statistics, Second Military Medical University, 800 Xiangyin Road, Shanghai 200433, China.
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28
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Yuan JM. Cancer prevention by green tea: evidence from epidemiologic studies. Am J Clin Nutr 2013; 98:1676S-1681S. [PMID: 24172305 PMCID: PMC3831544 DOI: 10.3945/ajcn.113.058271] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
Abstract
In contrast to the consistent results of an inhibitory effect of green tea extracts and tea polyphenols on the development and growth of carcinogen-induced tumors in experimental animal models, results from human studies are mixed. Both observational and intervention studies have provided evidence in support of a protective role of green tea intake in the development of oral-digestive tract cancer or an inhibitory role of oral supplementation of green tea extract on a precancerous lesion of oral cavity. Evidence in support of green tea intake against the development of liver cancer risk is limited and inconsistent. An inverse association between green tea intake and lung cancer risk has been observed among never smokers but not among smokers. Although observational studies do not support a beneficial role of tea intake against the development of prostate cancer, several phase 2 clinical trials have shown an inhibitory effect of green tea extract against the progression of prostate premalignant lesions to malignant tumors. Prospective epidemiologic studies so far have not provided evidence for a protective effect of green tea consumption on breast cancer development. Current data neither confirm nor refute a definitive cancer-preventive role of green tea intake. Large randomized intervention trials on the efficacy of green tea polyphenols or extracts are required before a recommendation for green tea consumption for cancer prevention should be made.
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Affiliation(s)
- Jian-Min Yuan
- University of Pittsburgh Cancer Institute and Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, PA
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29
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Vuong QV. Epidemiological Evidence Linking Tea Consumption to Human Health: A Review. Crit Rev Food Sci Nutr 2013; 54:523-36. [DOI: 10.1080/10408398.2011.594184] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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30
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Chen GL, Hu K, Zhong NJ, Guo J, Gong YS, Deng XT, Huang YS, Chu DK, Gao YQ. Antioxidant capacities and total polyphenol content of nine commercially available tea juices measured by an in vitro digestion model. Eur Food Res Technol 2012. [DOI: 10.1007/s00217-012-1897-2] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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Gao J, Xie L, Yang WS, Zhang W, Gao S, Wang J, Xiang YB. Risk factors of hepatocellular carcinoma--current status and perspectives. Asian Pac J Cancer Prev 2012; 13:743-52. [PMID: 22631642 DOI: 10.7314/apjcp.2012.13.3.743] [Citation(s) in RCA: 107] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023] Open
Abstract
Hepatocellular carcinoma is a common disorder worldwide which ranks 5th and 7th most common cancer among men and women. In recent years, different incidence trends have been observed in various regions, but the reasons are not completely understood. However, due to the great public efforts in HCC prevention and alternation of lifestyle, the roles of some well documented risk factors played in hepatocarcinogenesis might have changed. This paper summarizes both the environmental and host related risk factors of hepatocellular carcinoma including well established risk factors such as hepatitis virus infection, aflatoxin and alcohol, as well as possible risk factors such as coffee drinking and other dietary agents.
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Affiliation(s)
- Jing Gao
- State Key Laboratory of Oncogene and Related Genes, Shanghai Cancer Institute, Shanghai, China
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Lam IK, Alex D, Wang YH, Liu P, Liu AL, Du GH, Lee SMY. In vitro and in vivo structure and activity relationship analysis of polymethoxylated flavonoids: identifying sinensetin as a novel antiangiogenesis agent. Mol Nutr Food Res 2012; 56:945-56. [PMID: 22707269 DOI: 10.1002/mnfr.201100680] [Citation(s) in RCA: 61] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
SCOPE Polymethoxylated flavonoids are present in citrus fruit in a range of chemical structures and abundance. These compounds have potential for anticarcinogenesis, antitumor, and cardiovascular protective activity, but the effect on angiogenesis has not been well studied. METHODS AND RESULTS Human umbilical vein endothelial cells (HUVECs) in vitro and zebrafish (Danio rerio) in vivo models were used to screen and identify the antiangiogenesis activity of seven polymethoxylated flavonoids; namely, hesperetin, naringin, neohesperidin, nobiletin, scutellarein, scutellarein tetramethylether, and sinensetin. Five, excluding naringin and neohesperidin, showed different degrees of potency of antiangiogenesis activity. Sinensetin, which had the most potent antiangiogenesis activity and the lowest toxicity, inhibited angiogenesis by inducing cell cycle arrest in the G0/G1 phase in HUVEC culture and downregulating the mRNA expressions of angiogenesis genes flt1, kdrl, and hras in zebrafish. CONCLUSION The in vivo structure-activity relationship (SAR) analysis indicated that a flavonoid with a methoxylated group at the C3' position offers a stronger antiangiogenesis activity, whereas the absence of a methoxylated group at the C8 position offers lower lethal toxicity in addition to enhancing the antiangiogenesis activity. This study provides new insight into how modification of the chemical structure of polymethoxylated flavonoids affects this newly identified antiangiogenesis activity.
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Affiliation(s)
- In Kei Lam
- Institute of Chinese Medical Sciences, University of Macau, Avenue Padre Tomás Pereira S.J., Taipa, Macao SAR, PR China
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Vuong QV, Tan SP, Stathopoulos CE, Roach PD. Improved extraction of green tea components from teabags using the microwave oven. J Food Compost Anal 2012. [DOI: 10.1016/j.jfca.2012.06.001] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Park M, Yamada H, Matsushita K, Kaji S, Goto T, Okada Y, Kosuge K, Kitagawa T. Green tea consumption is inversely associated with the incidence of influenza infection among schoolchildren in a tea plantation area of Japan. J Nutr 2011; 141:1862-70. [PMID: 21832025 DOI: 10.3945/jn.110.137547] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Green tea is known to contain antiviral components that prevent influenza infection. A limited number of adult clinical studies have been undertaken, but there is a paucity of clinical evidence concerning children. We conducted an observational study to determine the association between green tea consumption and the incidence of influenza infection among schoolchildren. Anonymous questionnaire surveys were undertaken twice during the influenza season from November 2008 to February 2009 (endemic seasonal type A influenza infection); each survey was conducted for 2663 pupils across all elementary schools in Kikugawa City (a tea plantation area), Japan. Each questionnaire was completed and submitted by 2050 pupils (response rate, 77.0%; age range, 6-13 y). The adjusted OR associated with the consumption of green tea for ≥6 d/wk compared with <3 d/wk was 0.60 [(95% CI = 0.39-0.92); P = 0.02] in cases of influenza confirmed by the antigen test. Meanwhile, the adjusted OR inversely associated with the consumption of 1 cup/d to <3 cups/d (1 cup = 200 mL) and 3-5 cups/d compared with <1 cup/d were 0.62 [(95% CI = 0.41-0.95); P = 0.03] and 0.54 [(95% CI = 0.30-0.94); P = 0.03], respectively. However, there was no significant association with the consumption of >5 cups/d. Our findings thus suggest that the consumption of 1-5 cups/d of green tea may prevent influenza infection in children.
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Affiliation(s)
- Mijong Park
- Department of Drug Evaluation and Informatics, School of Pharmaceutical Sciences, University of Shizuoka, Shizuoka, Japan
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Li Y, Chang SC, Goldstein BY, Scheider WL, Cai L, You NCY, Tarleton HP, Ding B, Zhao J, Wu M, Jiang Q, Yu S, Rao J, Lu QY, Zhang ZF, Mu L. Green tea consumption, inflammation and the risk of primary hepatocellular carcinoma in a Chinese population. Cancer Epidemiol 2011; 35:362-8. [PMID: 21315679 PMCID: PMC3396119 DOI: 10.1016/j.canep.2011.01.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2010] [Revised: 12/27/2010] [Accepted: 01/11/2011] [Indexed: 12/22/2022]
Abstract
OBJECTIVE Green tea has been found to possess anti-inflammatory, anti-oxidative and anti-carcinogenic properties. The present study examines the association between green tea drinking and hepatocellular carcinoma (HCC) and its interactions with other risk or protective factors and single nucleotide polymorphisms (SNP) of inflammation and oxidative stress related genes. METHODS A population-based case-control study with 204 primary HCC cases and 415 healthy controls was conducted in Taixing, China. Epidemiological data were collected using a standard questionnaire. SNPs of genes of the inflammation and metabolic pathways were genotyped at the UCLA Molecular Epidemiology Laboratory. Logistic regression was performed to estimate adjusted odds ratios and 95% confidence intervals. RESULTS Longer duration and larger quantities of green tea consumption were inversely associated with primary HCC. Individuals who drank green tea longer than 30 years were at lowest risk (adjusted OR=0.44, 95% CI: 0.19-0.96) compared with non-drinkers. A strong interaction was observed between green tea drinking and alcohol consumption (adjusted OR for interaction=3.40, 95% CI: 1.26-9.16). Green tea drinking was also observed to have a potential effect modification on HBV/HCV infection, smoking and polymorphisms of inflammation related cytokines, especially for IL-10. CONCLUSION Green tea consumption may protect against development of primary HCC. Potential effect modifications of green tea on associations between primary HCC and alcohol drinking, HBV/HCV infection, and inflammation-related SNPs were suggested.
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Affiliation(s)
- Yanli Li
- Department of Social and Preventive Medicine, The State University of New York (SUNY) at Buffalo, NY, USA
| | - Shen-Chih Chang
- Department of Epidemiology, School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Binh Y. Goldstein
- Department of Epidemiology, School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - William L. Scheider
- Department of Social and Preventive Medicine, The State University of New York (SUNY) at Buffalo, NY, USA
| | - Lin Cai
- Department of Epidemiology, School of Public Health, Fujian Medical University, Fuzhou, Fijian, China
| | - Nai-Chieh Y. You
- Department of Epidemiology, School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Heather P. Tarleton
- Department of Epidemiology, School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Baoguo Ding
- Taixing City Center for Disease Control and Prevention (CDC), Taixing City, Jiangsu, China
| | - Jinkou Zhao
- Jiangsu Center for Disease Control and Prevention (CDC), Nanjing, Jiangsu, China
| | - Ming Wu
- Jiangsu Center for Disease Control and Prevention (CDC), Nanjing, Jiangsu, China
| | - Qingwu Jiang
- Fudan University School of Public Health, Shanghai, China
| | - Shunzhang Yu
- Fudan University School of Public Health, Shanghai, China
| | - Jianyu Rao
- Department of Pathology and Lab Med, School of Medicine, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Qing-Yi Lu
- Center for Human Nutrition, School of Medicine, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Zuo-Feng Zhang
- Department of Epidemiology, School of Public Health, University of California, Los Angeles (UCLA), Los Angeles, CA, USA
| | - Lina Mu
- Department of Social and Preventive Medicine, The State University of New York (SUNY) at Buffalo, NY, USA
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Schönthal AH. Adverse effects of concentrated green tea extracts. Mol Nutr Food Res 2011; 55:874-85. [PMID: 21538851 DOI: 10.1002/mnfr.201000644] [Citation(s) in RCA: 59] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2010] [Revised: 02/09/2011] [Accepted: 03/11/2011] [Indexed: 01/08/2023]
Abstract
A myriad of health claims are being made in favor of the consumption of green tea. However, mostly due to the easy availability and greater than ever popularity of highly concentrated green tea extracts, sometimes combined with an attitude of more-is-better, certain health risks of green tea consumption have begun to emerge. Among such risks are the possibility of liver damage, the potential to interact with prescription drugs to alter their therapeutic efficacy, and the chance to cause harm when combined with other highly popular herbal remedies. This review will summarize documented examples of adverse effects of green tea in humans, and will discuss risks of copious consumption of highly concentrated green tea extracts as indicated by studies in animals. While there is no intention to minimize any of the scientifically established benefits of the use of green tea, the purpose of this review is to focus primarily on the potential for adverse effects and raise awareness of the rare, yet under-appreciated risks.
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Affiliation(s)
- Axel H Schönthal
- Department of Molecular Microbiology and Immunology, Keck School of Medicine, University of Southern California, Los Angeles, CA, USA.
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Yuan JM, Sun C, Butler LM. Tea and cancer prevention: epidemiological studies. Pharmacol Res 2011; 64:123-35. [PMID: 21419224 DOI: 10.1016/j.phrs.2011.03.002] [Citation(s) in RCA: 121] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/29/2010] [Accepted: 03/02/2011] [Indexed: 12/23/2022]
Abstract
Experimental studies have consistently shown the inhibitory activities of tea extracts on tumorigenesis in multiple model systems. Epidemiological studies, however, have produced inconclusive results in humans. A comprehensive review was conducted to assess the current knowledge on tea consumption and risk of cancers in humans. In general, consumption of black tea was not associated with lower risk of cancer. High intake of green tea was consistently associated with reduced risk of upper gastrointestinal tract cancers after sufficient control for confounders. Limited data support a protective effect of green tea on lung and hepatocellular carcinogenesis. Although observational studies do not support a beneficial role of tea intake on prostate cancer risk, phase II clinical trials have demonstrated an inhibitory effect of green tea extract against the progression of prostate pre-malignant lesions. Green tea may exert beneficial effects against mammary carcinogenesis in premenopausal women and recurrence of breast cancer. There is no sufficient evidence that supports a protective role of tea intake on the development of cancers of the colorectum, pancreas, urinary tract, glioma, lymphoma, and leukemia. Future prospective observational studies with biomarkers of exposure and phase III clinical trials are required to provide definitive evidence for the hypothesized beneficial effect of tea consumption on cancer formation in humans.
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Affiliation(s)
- Jian-Min Yuan
- The Masonic Cancer Center, and Division of Epidemiology and Community Health, School of Public Health, University of Minnesota, 425 East River Road, 554 MCRB, Minneapolis, MN 55455, USA.
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Coffee consumption and reduced risk of hepatocellular carcinoma: findings from the Singapore Chinese Health Study. Cancer Causes Control 2011; 22:503-10. [PMID: 21258859 DOI: 10.1007/s10552-010-9725-0] [Citation(s) in RCA: 55] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/06/2010] [Accepted: 12/29/2010] [Indexed: 12/23/2022]
Abstract
BACKGROUND Coffee consumption has been associated with reduced markers of hepatic cell damage, reduced risk of chronic liver disease, and cirrhosis across a variety of populations. Data on the association between coffee consumption and risk of hepatocellular carcinoma (HCC), especially in high-risk populations, are sparse. METHODS This study examines the relationship between coffee and caffeine consumption, and the risk of developing HCC within the Singapore Chinese Health Study, a prospective cohort of 63,257 middle-aged and older Chinese men and women, a relatively high-risk population for HCC. Baseline data on coffee consumption and other dietary and lifestyle factors were collected through in-person interviews at enrollment between 1993 and 1998. RESULTS As of 31 December 2006, 362 cohort participants had developed HCC. High levels of coffee or caffeine consumption were associated with reduced risk of HCC (p for trend < 0.05). Compared with non-drinkers of coffee, individuals who consumed three or more cups of coffee per day experienced a statistically significant 44% reduction in risk of HCC (hazard ratio 0.56, 95% confidence interval, 0.31-1.00, p = .049) after adjustment for potential confounders and tea consumption. CONCLUSION These data suggest that coffee consumption may reduce the risk of developing HCC in Chinese in Singapore.
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