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Yu L, Zongxin L, Qiang L. A sensitive N-nitroso- N-methylurea sensor based on graphene-like BC3 and NC3 layers. Mol Phys 2020. [DOI: 10.1080/00268976.2020.1790682] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Liao Yu
- Business School, Sichuan University, Chengdu, People’s Republic of China
| | - Liu Zongxin
- West China Hospital, Sichuan University, Chengdu, People’s Republic of China
| | - Li Qiang
- The University of Tulsa, Tulsa, OK, USA
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Inami K, Asada Y, Harada T, Okayama Y, Usui N, Mochizuki M. Antimutagenic components in Spatholobus suberectus Dunn against N-methyl- N-nitrosourea. Genes Environ 2019; 41:22. [PMID: 31890055 PMCID: PMC6907206 DOI: 10.1186/s41021-019-0137-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 11/25/2019] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND An extract from Spatholobus suberectus (S. suberectus) Dunn has been reported to show potent antimutagenic effects against N-alkyl-N-nitrosoureas in umu screening. The aim of this study was to identify the antimutagenic components from extracts of S. suberectus against N-methyl-N-nitrosourea (MNU) in the Ames assay with Salmonella typhimurium strain TA1535 and to elucidate the antimutagenic mechanism of the flavonoids. RESULTS From the ethyl acetate fraction obtained from fractionation of the methanol extract of S. suberectus Dunn, medicarpin, formononetin and isoliquiritigenin were successfully isolated through a combination of normal- and reversed-phase chromatography. Genistein and naringenin, which were already reported to be contained in S. suberectus Dunn, were also tested for their antimutagenicity towards MNU, along with formononetin, isoliquiritigenin and medicarpin. Our results demonstrated that genistein, isoliquiritigenin, medicarpin and naringenin were antimutagenic against MNU without showing cytotoxicity. MNU is reported to cause not only DNA alkylation but also induce reactive oxygen species. The hydroxyl radical scavenging capacity of the flavonoids was correlated with the antimutagenic capacity, indicating that the hydroxyl radical scavenging activity was involved in their antimutagenicity towards MNU. CONCLUSIONS It is important to prevent DNA damage by N-nitrosamines for cancer chemoprevention. Genistein, isoliquiritigenin, medicarpin and naringenin were demonstrated to possess an antigenotoxic effects against carcinogenic MNU due to their radical scavenging activity.
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Affiliation(s)
- Keiko Inami
- Faculty of Pharmaceutical Sciences, Sanyo-onoda City University, Daigakudo-ri 1-1-1, Sanyo-onoda-shi, Yamaguchi, 756-0884 Japan
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Noda-shi, Chiba, 278-8510 Japan
| | - Yoshihisa Asada
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Noda-shi, Chiba, 278-8510 Japan
| | - Takumi Harada
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Noda-shi, Chiba, 278-8510 Japan
| | - Yuta Okayama
- Faculty of Pharmaceutical Sciences, Sanyo-onoda City University, Daigakudo-ri 1-1-1, Sanyo-onoda-shi, Yamaguchi, 756-0884 Japan
| | - Noriko Usui
- Faculty of Pharmaceutical Sciences, Sanyo-onoda City University, Daigakudo-ri 1-1-1, Sanyo-onoda-shi, Yamaguchi, 756-0884 Japan
| | - Masataka Mochizuki
- Faculty of Pharmaceutical Sciences, Sanyo-onoda City University, Daigakudo-ri 1-1-1, Sanyo-onoda-shi, Yamaguchi, 756-0884 Japan
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, 2641 Noda-shi, Chiba, 278-8510 Japan
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Inami K, Mine Y, Tatsuzaki J, Mori C, Mochizuki M. Isolation and characterization of antimutagenic components of Glycyrrhiza aspera against N-methyl- N-nitrosourea. Genes Environ 2017; 39:5. [PMID: 28074112 PMCID: PMC5217204 DOI: 10.1186/s41021-016-0068-2] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2016] [Accepted: 12/08/2016] [Indexed: 01/13/2023] Open
Abstract
Background A powdered ethanolic extract of Glycyrrhiza aspera root exhibits antimutagenic activity against N-methyl-N-nitrosourea (MNU) based on the Ames assay with Salmonella typhimurium TA1535. The aim of this study was to identify the antimutagenic components of the powdered ethanolic extract of G. aspera root. Results The powdered ethanolic extract of G. aspera root was sequentially suspended in n-hexane, carbon tetrachloride, dichloromethane, ethyl acetate, and ethanol, and each solvent soluble fraction and the residue were assayed for antimutagenic activity against MNU in S. typhimurium TA1535. The dichloromethane soluble fraction exhibited the highest antimutagenicity and was fractionated several times by silica gel chromatography. The fraction with the highest antimutagenic activity was further purified using HPLC, and the fractions were assayed for antimutagenicity against MNU in S. typhimurium TA1535. Finally, five components with antimutagenic activity against MNU were identified as glyurallin A, glyasperin B, licoricidin, 1-methoxyphaseollin, and licoisoflavone B. Conclusions The five components were demonstrated to possess an antigenotoxic effect against carcinogenic MNU for the first time. It is important to prevent DNA damage by N-nitrosamines for cancer chemoprevention. Electronic supplementary material The online version of this article (doi:10.1186/s41021-016-0068-2) contains supplementary material, which is available to authorized users.
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Affiliation(s)
- Keiko Inami
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510 Japan
| | - Yusuke Mine
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510 Japan
| | | | | | - Masataka Mochizuki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda, Chiba 278-8510 Japan
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Inami K, Mine Y, Kojo Y, Tanaka S, Ishikawa S, Mochizuki M. Antimutagenic components in Glycyrrhiza against N-methyl-N-nitrosourea in the Ames assay. Nat Prod Res 2016; 31:691-695. [DOI: 10.1080/14786419.2016.1212031] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Affiliation(s)
- Keiko Inami
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda-shi, Japan
- Kyoritsu University of Pharmacy, Tokyo, Japan
| | - Yusuke Mine
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda-shi, Japan
| | - Yukiko Kojo
- Kyoritsu University of Pharmacy, Tokyo, Japan
| | - Satomi Tanaka
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda-shi, Japan
| | - Satoko Ishikawa
- Kyoritsu University of Pharmacy, Tokyo, Japan
- Faculty of Pharmacy, Keio University, Tokyo, Japan
| | - Masataka Mochizuki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Noda-shi, Japan
- Kyoritsu University of Pharmacy, Tokyo, Japan
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Fermented papaya preparation modulates the progression of N-methyl-N-nitrosourea induced hepatocellular carcinoma in Balb/c mice. Life Sci 2016; 151:330-338. [PMID: 26979773 DOI: 10.1016/j.lfs.2016.03.026] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2015] [Revised: 03/08/2016] [Accepted: 03/11/2016] [Indexed: 11/21/2022]
Abstract
AIM AND MAIN METHOD The medicinal properties of fermented papaya preparation (FPP) derived from Carica papaya fruit was investigated in order to determine its ability to modulate the progression of N-methyl-N-nitrosourea induced hepatocellular carcinoma in Balb/c mice. KEY FINDINGS As well as reducing the physical symptoms associated with N-methyl-N-nitrosourea (MNU)-induced hepatocellular carcinoma, supplementation of Balb/c mice with 500mg FPP/kg BW for 92days normalized the blood cell count, led to an increased activity of several key antioxidant enzymes (SOD: +20%, CAT: +81%, GPx: +66.1%, GR: +54.4%; P<0.001 vs. MNU control), increased the ferrous reducing antioxidant potential (+36.7%, P<0.001 vs. MNU control) and reduced the extent of lipid peroxidation in the liver by 44.3% (P<0.001 vs. MNU control). SIGNIFICANCE Results demonstrated the ability of FPP to preserve the integrity of liver against oxidative damage and protect hepatocytes against irreversible DNA structural modifications induced by MNU, highlighting its potential role as an immune-defense modulator during hepatocarcinoma.
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Inami K, Shiino J, Hagiwara S, Takeda K, Mochizuki M. Transnitrosation of non-mutagenic N-nitrosoproline forms mutagenic N-nitroso-N-methylurea. Bioorg Med Chem 2015; 23:3297-302. [PMID: 25975641 DOI: 10.1016/j.bmc.2015.04.058] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 04/17/2015] [Accepted: 04/18/2015] [Indexed: 10/23/2022]
Abstract
N-Nitroso-N-methylurea (NMU) is a potent carcinogen and suspected as a cause of human cancer. In this study, mutagenic NMU was detected by HPLC after the transnitrosation of non-mutagenic N-nitrosoproline (NP) to N-methylurea in the presence of thiourea (TU) under acidic conditions. The structure of NMU was confirmed by comparing (1)H NMR and IR spectra with that of authentic NMU after fractionation by column chromatography. Furthermore, a fraction containing NMU formed by transnitrosation was mutagenic in Salmonella typhimurium TA1535. NMU was formed in the reaction of NP and N-methylurea in the presence of 1,1,3,3-tetramethylthiourea (TTU) or 1,3-dimethylthiourea in place of TU as an accelerator. The reaction rate constants (k) for NMU formation were correlated with their nucleophilicity of sulfur atom in thioureas. The N-methylurea concentration did not affect the NMU formation, whereas the rate of NMU formation correlated linearly with concentrations of NP, TTU and oxonium ion. The observed kinetics suggests a mechanism by which the nitroso group was transferred directly from the protonated NP to the thiourea then to N-methylurea to form NMU. The rate-determining step was the formation of the complex with the protonated NP and thiourea.
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Affiliation(s)
- Keiko Inami
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda-shi, Chiba 278-8510, Japan; Kyoritsu University of Pharmacy, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan.
| | - Junko Shiino
- Kyoritsu University of Pharmacy, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan
| | - Shin Hagiwara
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda-shi, Chiba 278-8510, Japan
| | - Kei Takeda
- Kyoritsu University of Pharmacy, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan
| | - Masataka Mochizuki
- Faculty of Pharmaceutical Sciences, Tokyo University of Science, Yamazaki 2641, Noda-shi, Chiba 278-8510, Japan; Kyoritsu University of Pharmacy, Shibakoen 1-5-30, Minato-ku, Tokyo 105-8512, Japan
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Abraham SK, Khandelwal N. Ascorbic acid and dietary polyphenol combinations protect against genotoxic damage induced in mice by endogenous nitrosation. MUTATION RESEARCH-GENETIC TOXICOLOGY AND ENVIRONMENTAL MUTAGENESIS 2013; 757:167-72. [DOI: 10.1016/j.mrgentox.2013.08.004] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/23/2013] [Revised: 08/08/2013] [Accepted: 08/12/2013] [Indexed: 10/26/2022]
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He WJ, Xu MY, Xu RR, Zhou XQ, Ouyang JJ, Han H, Chen GZ. Inpatients' Knowledge about Primary Liver Cancer and Hepatitis. Asian Pac J Cancer Prev 2013; 14:4913-8. [DOI: 10.7314/apjcp.2013.14.8.4913] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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Lin D, Zhu L, Luo L. Factors affecting transfer of polycyclic aromatic hydrocarbons from made tea to tea infusion. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2006; 54:4350-4. [PMID: 16756366 DOI: 10.1021/jf060189j] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Factors affecting transfer percentages of 12 polycyclic aromatic hydrocarbons (PAHs) were investigated, including tea variety, tea/water ratio (TWR, g/mL), brewing times, washed tea or unwashed tea, and covered cup or uncovered cup. It was observed that %PAH transfer varied with tea variety and increased with the decrease of TWR. The mean %PAH transfer with TWR = 1/150 was 1.12 and 1.65 times higher than that with TWR = 1/100 and 1/50, respectively. %PAH transfer reduced greatly as the brewing times increased. The mean %PAH transfer in the first brewing time occupied 51.6% of the total three mean %PAH transfers in the three brewing times. The mean %PAH transfer decreased by 30.4% after the tea had been washed immediately before brewing. Brewing the tea within uncovered cup diminished %PAH transfer by a degree of 4.31-31.7% compared to brewing the tea within a covered cup.
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Affiliation(s)
- Daohui Lin
- Department of Environmental Science, Zhejiang University, Hangzhou, Zhejiang, China 310028
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Ahn HJ, Lee CH, Kim JH, Han SB, Jo C, Kim S, Byun MW. Identification of radiolytic products from N-nitrosodimethylamine and N-nitrosopyrrolidine by gas chromatography and mass spectrometry. Radiat Phys Chem Oxf Engl 1993 2004. [DOI: 10.1016/s0969-806x(03)00330-x] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Hung CY, Yen GC. Antioxidant activity of phenolic compounds isolated from Mesona procumbens Hemsl. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2002; 50:2993-2997. [PMID: 11982431 DOI: 10.1021/jf011454y] [Citation(s) in RCA: 60] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
The antioxidant activity of phenolic compounds isolated from Mesona procumbens Hemsl. (Hsian-tsao) was investigated. Hsian-tsao was extracted with various solvents, and the results showed that the fraction treated with acidic ethyl acetate (pH 2) possessed large amounts of phenolic compounds and a strong antioxidant activity on peroxidation of linoleic acid. The antioxidant activity (inhibition of peroxidation, IP%) of the acidic ethyl acetate of Hsian-tsao extract at 50 microg/mL (98.9%) was stronger than those of 50 microg/mL alpha-tocopherol (78%) and BHA at 10 microg/mL (90%). When fractionated with Amberlite XAD-7 gel chromatography, the acidic ethyl acetate fraction of Hsian-tsao extract was separated into four subfractions (A-D). Subfraction B, with high yield and strong antioxidant activity, was further isolated and purified and then identified as containing protocatechuic acid, p-hydroxybenzoic acid, vanillic acid, caffeic acid, and syringic acid by means of UV, EI-MS, and (1)H and (13)C NMR. The antioxidant capability of isolated compounds was also determined using the thiocyanate system and the erythrocyte ghost system. The results indicate that the phenolic acids could be important antioxidant components in Hsian-tsao, among which caffeic acid with the highest antioxidant activity and the greatest content is most important.
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Affiliation(s)
- Chien-Ya Hung
- Department of Food Science, National Chung Hsing University, 250 Kuokuang Road, Taichung 402, Taiwan, Republic of China
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Ahn H, Yook H, Rhee M, Lee C, Cho Y, Byun M. Application of Gamma Irradiation on Breakdown of Hazardous Volatile N-Nitrosamines. J Food Sci 2002. [DOI: 10.1111/j.1365-2621.2002.tb10644.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Sen NP, Seaman SW, Baddoo PA, Burgess C, Weber D. Formation of N-nitroso-N-methylurea in various samples of smoked/dried fish, fish sauce, seafoods, and ethnic fermented/pickled vegetables following incubation with nitrite under acidic conditions. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2001; 49:2096-2103. [PMID: 11308373 DOI: 10.1021/jf0011384] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
In continuation of our previous studies on N-nitroso-N-methylurea (NMU) formation in cured meats following incubation with nitrite at gastric pH, we extended the investigation to other foods mentioned in the title of this paper. The main objective was to determine whether these foods have the potential to form NMU at pH's that can be found in the human stomach. This was done by nitrosating an aliquot (5 g for fish sauce, 10 g for the others) of each with 7.25 microM to 1.59 mM levels of sodium nitrite for 2 h at room temperature at pH 0.8--1.5 and measuring the amounts of NMU formed. Of the samples tested, fish sauce formed 2--712 ng of NMU, followed in decreasing order by herring (<0.3--688 ng); dried anchovy, shrimp, and other fishes (<0.3--134 ng); crab and lobster paté (<0.3--342 ng); sardines (6--59 ng); oysters and mussels (11--31 ng); dried squid (3--47 ng); kimchi (7--107 ng); and Japanese pickled radish (<0.3--72 ng). Incorporation of 200-2000 ppm of ascorbic acid in the fish sauce and other foods, prior to nitrosation, appreciably inhibited such NMU formation. Although previous researchers in China reported NMU formation in nitrosated samples of fish sauce, this is the first reported formation of NMU upon nitrosation of the other foods mentioned above, and the first reported inhibition of such formation by added ascorbic acid.
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Affiliation(s)
- N P Sen
- Food Research Division (2203D), Bureau of Chemical Safety, Food Directorate, Health Products and Food Branch, Health Canada, Ottawa, Ontario, Canada K1A 0L2.
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Blot WJ, Henderson BE, Boice JD. Childhood cancer in relation to cured meat intake: review of the epidemiological evidence. Nutr Cancer 2001; 34:111-8. [PMID: 10453449 DOI: 10.1207/s15327914nc340115] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
Abstract
Over the past two decades a series of epidemiological studies have examined the relationship between consumption of cured meats during pregnancy and the subsequent risk of brain tumors, as well as other cancers, in the offspring. The research was prompted in large part by experimental investigations showing that transplacental exposure to certain N-nitroso compounds, i.e., nitrosoureas, could produce brain tumors in laboratory animals. Fourteen such epidemiological studies, 13 of which used the case-control approach, are reviewed here. Most of the studies showed no significant association between total cured meat intake and childhood cancer risk but more found positive than negative relationships. Furthermore, several studies reported significant positive associations for maternal and sometimes childhood or paternal consumption of one or more cured meats, with odds ratios of twofold or greater reported among the highest consumers. On the other hand, a correlation analysis found no positive concordance between temporal trends from the 1970s to 1990s in childhood brain cancer rates and cured meat consumption, inasmuch as cancer rates rose over time while residual nitrite levels in cured meats fell sharply. Because of the potential for bias, especially recall bias, and/or confounding, the relatively weak magnitude of the associations reported, and the inconsistency between study findings, at this time it cannot be concluded that eating cured meat has increased the risk of childhood brain cancer or any other cancers. Moreover, although N-nitroso compounds are sometimes found in cured meats or may be formed endogenously, there is no empirical evidence that eating cured meats results in human neural nitrosourea exposure. Nevertheless, the hypothesis that eating nitrite-cured meats may influence childhood and perhaps adult brain cancer cannot be dismissed. Unbiased evaluation of the hypothesis may derive from the conduct of cohort studies, where the interview-derived information on cured meat intake precedes, or is not otherwise associated with, the diagnosis of cancer.
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Affiliation(s)
- W J Blot
- International Epidemiology Institute, Rockville, MD 20850, USA
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Cai L, Yu SZ, Ye WM, Yi YN. Fish sauce and gastric cancer: an ecological study in Fujian Province, China. World J Gastroenterol 2000; 6:671-675. [PMID: 11819672 PMCID: PMC4688841 DOI: 10.3748/wjg.v6.i5.671] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
Abstract
AIM: To explore the relationship between consumption of fish sauce and the risk of gastric cancer in Fujian Province.
METHODS: An ecological study was carried out. A total of 11000 subjects from 55 townships were randomly selected from 10 counties within Fujian Province. All subjects were local residents who had been living in Fujian Province for more than 20 years, within the age group of 45-74 years. Trained interviewers conducted face-to-face interviews with a standardized questionnaire, which covered the frequency and amount of food intake, dietary habit, tobacco and alcohol consumption and history of chronic gastric diseases. Univariate and multivariate analyses were performed using Epi-info and SAS statistical packages, respectively.
RESULTS: A significant correlation between monthly consumption of fish sauce and mortality of gastric cancer was found. Pearson’s coefficient of correlation was statistically significant with r = 0.7356 for males, r = 0.5246 for females (P < 0.01). In the multivariate analysis, consumption of fish sauce still showed an association with the risk of gastric cancer. No significant positive correlation between esophagus cancer, liver cancer, colon cancer and consumption of fish sauce were observed.
CONCLUSION: Long-term intake of fish sauce may be related to high mortality of gastric cancer. Consumption of fish sauce might be one of important and unique etiologic factors of gastric cancer in Fujian Province. Further studies are needed to confirm this ecological study.
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