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stomach neoplasms/proline
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Urinary excretion of N-nitrosamino acids and nitrate by inhabitants in high- and low-risk areas for stomach cancer in northern Japan.
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Three samples of 24-h urine were collected from each of 104 inhabitants of high-risk (Akita) and low-risk (Iwate) areas for stomach cancer in northern Japan, according to the following protocols: (i) when they were undosed, (ii) after ingestion of proline three times a day and (iii) after ingestion
Urinary excretion of N-nitrosamino acids and nitrate by inhabitants of high- and low-risk areas for stomach cancer in Poland.
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Urine samples were collected from 96 inhabitants of a high-risk rural area and a low-risk urban area for stomach cancer in Poland, according to the following protocol: (1) when they were undosed; (2) after ingestion of proline 3 times a day; and (3) after ingestion of proline together with vitamin C
Analysis of low-molecular-weight metabolites in stomach cancer cells by a simplified and inexpensive GC/MS metabolomics method.
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GC/MS coupled metabolomics analysis, using a simplified and much less expensive silylation process with trimethylsilyl cyanide (TMSCN), was conducted to investigate metabolic abnormalities in stomach cancer cells. Under optimized conditions for derivatization by TMSCN and methanol extraction, 228
Deregulation of collagen metabolism in human stomach cancer.
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OBJECTIVE
The defects of collagen metabolism are responsible for the disorganization of extracellular matrix in stomach cancer. Collagen through interaction with integrin receptors regulates the cellular growth, differentiation, gene expression, prolidase and gelatinase activity and plays an
A correlation study on urinary excretion of N-nitroso compounds and cancer mortality in China: interim results.
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Samples of 12-h overnight urine were collected from approximately 40 male adults in each of the 26 counties of China. Two urine specimens were collected from each subject--one after a loading dose of proline and ascorbic acid and another after a loading dose of proline only. Levels of N-nitrosamino
Exposure to N-nitrosamines and other risk factors for gastric cancer in Costa Rican children.
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The hypothesis that endogenous chemical nitrosation in the normal stomach in early life could play a crucial role in inducing chronic atrophic gastritis/intestinal metaplasia in later life was tested by applying the N-nitrosoproline (NPRO) test to 12-h urine samples from about 50 children (aged 8-14
In vivo nitrosoproline formation and other risk factors in Costa Rican children from high- and low-risk areas for gastric cancer.
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The hypothesis that intragastric synthesis of N-nitroso compounds (NOC) in early life could play a role in gastric carcinogenesis was tested by applying the N-nitrosoproline (NPRO) test to about 50 children living in high- and low-risk areas for stomach cancer in Costa Rica. The median values of
High concentrations of D-amino acids in human gastric juice.
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The concentrations of free D- and L-amino acids were determined in the gastric juice from four groups: patients suffering from early gastric carcinoma with or without Helicobacter pylori infection, and patients without carcinoma but with peptic ulcers, duodenal ulcers or chronic gastritis with or
Intragastric nitrosation and precancerous lesions of the gastrointestinal tract: testing of an etiological hypothesis.
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The N-nitrosoproline (NPRO) test was used to study whether subjects with precancerous conditions of the stomach have an elevated potential for endogenous nitrosation. The highest yield of NPRO after ingestion of beetroot juice (as a source of nitrate) and proline was seen in subjects whose pH of
Aberrant regulation of argininosuccinate synthetase by TNF-alpha in human epithelial ovarian cancer.
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The pro-inflammatory cytokine, tumour necrosis factor-alpha, TNF-alpha, is dysregulated in malignant compared with normal ovarian surface epithelium (OSE). Several epidemiological studies have associated inflammation with ovarian tumorigenesis, with TNF-alpha playing a key role in modulating
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