n-nitrosomorpholine has been researched along with Liver Neoplasms in 49 studies
| Timeframe | Studies, this research(%) | All Research% |
|---|---|---|
| pre-1990 | 27 (55.10) | 18.7374 |
| 1990's | 10 (20.41) | 18.2507 |
| 2000's | 10 (20.41) | 29.6817 |
| 2010's | 2 (4.08) | 24.3611 |
| 2020's | 0 (0.00) | 2.80 |
| Authors | Studies |
|---|---|
| Baydar, T; Erkekoglu, P | 1 |
| Eck, WS; Fishbein, JC; Ginevan, B; Koissi, N; Roebuck, BD; Shah, NH | 1 |
| Choi, YC; Jeong, JS; Jung, KJ; Kim, IH; Kim, SS; Lee, SH; Park, WY | 1 |
| de Gunst, MC; Dewanji, A; Luebeck, EG | 1 |
| Dombrowski, F; Evert, M; Jost, CM; Manekeller, S | 1 |
| Cho, YM; Futakuchi, M; Imai, N; Ogawa, K; Shirai, T; Takeshita, F; Tamano, S; Yoshino, H | 1 |
| Elrick, MM; Mitchell, MD; Thompson, DC; Walgren, JL | 1 |
| Bannasch, P; Groos, J; Kopp-Schneider, A; Schwarz, M | 1 |
| Chalupa, I; Kogan, G; Slamenova, D; Smigova, J; Sramkova, M | 1 |
| Llombart Bosch, A; Peydro Olaya, A | 1 |
| Guenthner, TM; Krischan, R; Kuhlmann, WD; Kunz, W; Oesch, F | 1 |
| Schulte-Hermann, R; Schuppler, J; Timmermann-Trosiener, I | 1 |
| Ohde, G; Schulte-Hermann, R; Schuppler, J; Timmermann-Trosiener, I | 1 |
| Kuhlmann, WD | 1 |
| Buchmann, A; Kunz, W; Schwarz, M; Wiesbeck, G | 1 |
| Buchmann, A; Kunz, W; Moore, M; Schwarz, M | 1 |
| Cohen, SM; Mahboubi, E; Mirvish, SS; Patil, K; Salmasi, S | 1 |
| Roome, N; Schulte-Hermann, R; Schuppler, J; Timmermann-Trosiener, I | 1 |
| Bannasch, P; Klimek, F; Mayer, D | 1 |
| Bannasch, P; Ito, N; Moore, MA | 1 |
| Knutsen, GL; Kovatch, RM; Lijinsky, W | 1 |
| de Gerlache, J; Fort, L; Lans, M; Roberfroid, M; Taper, HS | 1 |
| Althoff, J; Holste, J; Ketkar, MB; Preussmann, R | 1 |
| Bannasch, P; Hacker, HJ; Moore, MA | 1 |
| Bannasch, P; Benner, U; Hacker, HJ; Klimek, F; Mayer, D; Moore, M; Zerban, H | 1 |
| Lijinsky, W; Reuber, MD | 1 |
| Bannasch, P; Mayer, D; Moore, MA | 1 |
| Bannasch, P; Bloch, M; Zerban, H | 1 |
| Bannasch, P; Mayer, F; Stroebel, P; Zerban, H | 1 |
| Baba, M; Iishi, H; Nakaizumi, A; Tatsuta, M; Uehara, H | 1 |
| Bannasch, P; Klimek, F | 1 |
| Bannasch, P; Klimek, F; Mayer, D; Rempel, A | 1 |
| Baba, M; Iishi, H; Tatsuta, M; Yamamoto, R | 1 |
| Grasl-Kraupp, B; Hufnagl, K; Löw-Baselli, A; Parzefall, W; Schulte-Hermann, R | 1 |
| Futakuchi, M; Hirose, M; Kato, K; Ogawa, K; Ogiso, T; Sano, M; Shirai, T | 1 |
| Baba, M; Iishi, H; Tatsuta, M | 1 |
| Geisler, I; Kopp-Schneider, A | 1 |
| Boelsterli, U; Zbinden, G | 1 |
| Taper, HS | 1 |
| Enzmann, H; Kaliner, G; Löser, E; Watta-Gebert, B | 1 |
| Luebeck, EG; Moolgavkar, SH | 1 |
| Bock, KW; Dirheimer, G; Keith, G; Münzel, PA; Pfohl-Leszkowicz, A; Röhrdanz, E | 1 |
| Barthel, G; Bursch, W; Schulte-Hermann, R; Timmermann-Trosiener, I | 1 |
| Bannasch, P; Dettler, T; Enzmann, H; Ohlhauser, D | 1 |
| Chung, FL; Hecht, SS; Kovatch, RM; Lijinsky, W; Saavedra, JE | 1 |
| Bannasch, P; Enzmann, H | 1 |
| Bannasch, P; Moore, MA; Weber, E | 2 |
| Bannasch, P; Ehemann, V; Hacker, HJ; Mayer, D | 1 |
4 review(s) available for n-nitrosomorpholine and Liver Neoplasms
| Article | Year |
|---|---|
Proteomics: recent applications and new technologies.
Topics: Animals; Biomarkers, Tumor; Blood Proteins; Breast Neoplasms; Carcinogens; Electrophoresis, Gel, Two-Dimensional; Humans; Liver Neoplasms; Neoplasm Proteins; Nitrosamines; Protein Array Analysis; Proteomics; RNA Interference; Software; Systems Biology; Toxicology | 2006 |
Cytochemical and biochemical microanalysis of carcinogenesis.
Topics: Animals; Histocytochemistry; Kidney; Kidney Neoplasms; Liver; Liver Neoplasms; Microscopy, Electron; Neoplasms; Neoplasms, Experimental; Nitrosamines; Precancerous Conditions; Rats | 1981 |
Hexokinase expression in liver preneoplasia and neoplasia.
Topics: Animals; Carcinogens; Carcinoma; Glucokinase; Hexokinase; Isoenzymes; Kinetics; Liver; Liver Neoplasms; Liver Neoplasms, Experimental; Nitrosamines; Precancerous Conditions; Rats | 1997 |
The role of somatic mutations and cell replication kinetics in quantitative cancer risk assessment.
Topics: Adenosine Triphosphatases; Administration, Oral; Animals; Carcinogenicity Tests; Carcinogens; Cell Division; Liver; Liver Neoplasms; Mutation; Nitrosamines; Precancerous Conditions; Rats; Risk Factors | 1991 |
45 other study(ies) available for n-nitrosomorpholine and Liver Neoplasms
| Article | Year |
|---|---|
Evaluation of the protective effect of ascorbic acid on nitrite- and nitrosamine-induced cytotoxicity and genotoxicity in human hepatoma line.
Topics: Antioxidants; Ascorbic Acid; Carcinoma, Hepatocellular; Cell Survival; Comet Assay; Cytoprotection; Diethylnitrosamine; Dimethylnitrosamine; DNA Damage; Dose-Response Relationship, Drug; Hep G2 Cells; Humans; Liver Neoplasms; Mutagens; Nitrites; Nitrosamines; Oxidative Stress; Reactive Oxygen Species; Time Factors | 2010 |
Lactone metabolite common to the carcinogens dioxane, diethylene glycol, and N-nitrosomorpholine: aqueous chemistry and failure to mediate liver carcinogenesis in the F344 rat.
Topics: Animals; Carcinogens; Dioxanes; Ethylene Glycols; Lactones; Liver; Liver Neoplasms; Male; Nitrosamines; Rats; Rats, Inbred F344 | 2012 |
Hepatotoxin N-nitrosomorpholine-induced carcinogenesis in rat liver: ex vivo exploration of preneoplastic and neoplastic hepatocytes.
Topics: Animals; Carcinogens; Carcinoma, Hepatocellular; Cell Transformation, Neoplastic; Cells, Cultured; Gene Expression Profiling; Gene Expression Regulation, Neoplastic; Hepatocytes; Hot Temperature; Liver Neoplasms; Neoplasm Transplantation; Nitrosamines; Oligonucleotide Array Sequence Analysis; Rats; Signal Transduction; Telomerase; Telomere | 2003 |
Exploring heterogeneity in tumour data using Markov chain Monte Carlo.
Topics: Animals; Bayes Theorem; Liver Neoplasms; Markov Chains; Models, Biological; Monte Carlo Method; Nitrosamines; Poisson Distribution; Precancerous Conditions; Rats; Stochastic Processes | 2003 |
Cocarcinogenic effects of islet hormones and N-nitrosomorpholine in hepatocarcinogenesis after intrahepatic transplantation of pancreatic islets in streptozotocin-diabetic rats.
Topics: Animals; Blood Glucose; Carcinogens; Cocarcinogenesis; Diabetes Mellitus, Experimental; Islets of Langerhans Transplantation; Liver Neoplasms; Male; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Lew | 2005 |
Modification of an in vivo lung metastasis model of hepatocellular carcinoma by low dose N-nitrosomorpholine and diethylnitrosamine.
Topics: Alkylating Agents; Animals; Carcinogens; Carcinoma, Hepatocellular; Diethylnitrosamine; Disease Models, Animal; Dose-Response Relationship, Drug; Humans; Liver Neoplasms; Lung Neoplasms; Male; Neoplasm Metastasis; Nitrosamines; Rats; Rats, Inbred F344; Survival | 2005 |
Comparison of mode of action of four hepatocarcinogens: a model-based approach.
Topics: 2-Acetylaminofluorene; Animals; Carcinogens; Clofibrate; Diethylnitrosamine; Female; Liver Neoplasms; Male; Models, Biological; Nitrosamines; Phenobarbital; Rats; Rats, Wistar; Sex Characteristics; Substrate Specificity | 2007 |
Reduction of genotoxic effects of N-nitrosomorpholine in human hepatoma cells and hamster lung cells by carboxymethyl chitin-glucan.
Topics: Animals; Antimutagenic Agents; Carcinoma, Hepatocellular; Cell Line; Chitin; Chromosome Aberrations; Cricetinae; DNA Damage; Glucans; Humans; Liver Neoplasms; Lung; Mutagens; Nitrosamines; Tumor Cells, Cultured | 2008 |
[Ultrastructure of human hepatic carcinomas compared with ultrastructural findings in hepatomas induced by chemical agents in Wistar rats and the golden hamster].
Topics: 9,10-Dimethyl-1,2-benzanthracene; Adenoma, Bile Duct; Animals; Carcinoma, Hepatocellular; Cricetinae; Diethylnitrosamine; Female; Humans; Liver Neoplasms; Liver Neoplasms, Experimental; Male; Mesocricetus; Nitrosamines; p-Dimethylaminoazobenzene; Rats; Rats, Inbred Strains | 1983 |
Focal elevation of liver microsomal epoxide hydrolase in early preneoplastic stages and its behaviour in the further course of hepatocarcinogenesis.
Topics: Adenosine Triphosphatases; Animals; Epoxide Hydrolases; Female; gamma-Glutamyltransferase; Liver; Liver Neoplasms; Liver Neoplasms, Experimental; Microsomes, Liver; Nitrosamines; Precancerous Conditions; Rabbits; Rats | 1981 |
Aberrant expression of adaptation to phenobarbital may cause selective growth of foci of altered cells in rat liver.
Topics: Animals; Carcinogens; Cytochrome P-450 Enzyme System; DNA Replication; Enzyme Induction; Female; gamma-Glutamyltransferase; Liver; Liver Neoplasms; Nitrosamines; Phenobarbital; Rats; Rats, Inbred Strains | 1984 |
Effect of tumor promoters on proliferation of putative preneoplastic cells in rat liver.
Topics: Animals; Carcinogens; Cell Division; Cyproterone; Cyproterone Acetate; Eating; Female; Hexachlorocyclohexane; Liver; Liver Neoplasms; Male; Mitotic Index; Nitrosamines; Precancerous Conditions; Progesterone; Rats; Rats, Inbred Strains | 1982 |
Alpha-fetoprotein: cellular origin of a biological marker in rat liver under various experimental conditions.
Topics: alpha-Fetoproteins; Animals; Carbon Tetrachloride Poisoning; Carcinoma, Hepatocellular; Liver; Liver Neoplasms; Liver Regeneration; Male; Mice; Microscopy, Electron; Nitrosamines; Rats | 1981 |
Effect of ethanol on early stages in nitrosamine carcinogenesis in rat liver.
Topics: Adenosine Triphosphatases; Alcoholism; Animals; Carcinogens; Diethylnitrosamine; Female; Humans; Liver Neoplasms; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1983 |
The mechanism of cocarcinogenic action of ethanol in rat liver.
Topics: Animals; Carcinogens; Dimethylnitrosamine; DNA Replication; Ethanol; Liver; Liver Neoplasms; Nitrosamines; Rats | 1984 |
Liver and forestomach tumors and other forestomach lesions in rats treated with morpholine and sodium nitrite, with and without sodium ascorbate.
Topics: Animals; Ascorbic Acid; Diet; Drug Interactions; Esophagus; Hyperplasia; Liver Neoplasms; Male; Morpholines; Nitrites; Nitrosamines; Papilloma; Rats; Sodium Nitrite; Stomach; Stomach Neoplasms; Time Factors | 1983 |
Immunocytochemical demonstration of a phenobarbital-inducible cytochrome P450 in putative preneoplastic foci of rat liver.
Topics: Animals; Carcinogens; Cytochrome P-450 Enzyme System; Enzyme Induction; Female; Histocytochemistry; Liver; Liver Neoplasms; Nitrosamines; Phenobarbital; Precancerous Conditions; Rats; Rats, Inbred Strains | 1984 |
Biochemical microanalysis of glycogen content and glucose-6-phosphate dehydrogenase activity in focal lesions of the rat liver induced by N-nitrosomorpholine.
Topics: Animals; Carcinogens; Glucosephosphate Dehydrogenase; Glycogen; Liver; Liver Neoplasms; Male; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1984 |
Modification of the development of N-nitrosomorpholine-induced hepatic lesions by 2-acetylaminofluorene, phenobarbital and 4,4'-diaminodiphenylmethane: a sequential histological and histochemical analysis.
Topics: 2-Acetylaminofluorene; Aniline Compounds; Animals; Carcinogens; Drug Interactions; Liver; Liver Neoplasms; Male; Neoplasms, Experimental; Nitrosamines; Phenobarbital; Rats; Rats, Inbred Strains | 1984 |
Carcinogenesis by nitrosomorpholines, nitrosooxazolidines and nitrosoazetidine given by gavage to Syrian golden hamsters.
Topics: Animals; Carcinogens; Cricetinae; Liver Neoplasms; Lung Neoplasms; Male; Mesocricetus; Neoplasms, Experimental; Nitrosamines; Nitroso Compounds; Nose Neoplasms; Structure-Activity Relationship; Tracheal Neoplasms | 1984 |
Morphological alterations and DNase deficiency in phenobarbital promotion of N-nitrosomorpholine initiated rat hepatocarcinogenesis.
Topics: Animals; Carcinogens; Deoxyribonucleases; Drug Synergism; Liver; Liver Neoplasms; Male; Neoplasms, Experimental; Nitrosamines; Phenobarbital; Precancerous Conditions; Rats; Rats, Inbred Strains | 1983 |
Carcinogenic effect of nitrosomorpholine administered in the drinking water to Syrian golden hamsters.
Topics: Animals; Carcinogens; Cricetinae; Digestive System Neoplasms; Female; Lethal Dose 50; Liver Neoplasms; Liver Neoplasms, Experimental; Male; Mesocricetus; Neoplasms, Experimental; Nitrosamines; Respiratory Tract Neoplasms; Sex Factors; Water | 1983 |
Phenotypic instability in focal and nodular lesions induced in a short term system in the rat liver.
Topics: Animals; Carcinogens; Enzymes; Glycogen; Liver; Liver Neoplasms; Male; Neoplasms, Experimental; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1983 |
Comparative carcinogenesis by nitrosomorpholines, nitrosooxazolidines and nitrosotetrahydrooxazine in rats.
Topics: Animals; Carcinogens; Female; Liver Neoplasms; Neoplasms, Experimental; Nitrosamines; Nitroso Compounds; Rats; Rats, Inbred F344; Structure-Activity Relationship | 1982 |
The dose dependence and sequential appearance of putative preneoplastic populations induced in the rat liver by stop experiments with N-nitrosomorpholine.
Topics: Animals; Carcinogens; Cell Nucleus; Cytoplasm; Dose-Response Relationship, Drug; Drug Administration Schedule; Liver Glycogen; Liver Neoplasms; Male; Neoplasms, Experimental; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1982 |
Spongiosis hepatis. Specific changes of the perisinusoidal liver cells induced in rats by N-nitrosomorpholine.
Topics: Animals; Disease Models, Animal; Liver Neoplasms; Microscopy, Electron; Morpholines; Nitrosamines; Rats | 1981 |
Spongiotic pericytoma: a benign neoplasm deriving from the perisinusoidal (Ito) cells in rat liver.
Topics: Animals; Autoradiography; Carcinogens; DNA Replication; DNA, Neoplasm; Hemangiopericytoma; Immunoenzyme Techniques; Liver Neoplasms; Male; Nitrosamines; Rats; Rats, Sprague-Dawley | 1995 |
Enhancement by isoproterenol of hepatocarcinogenesis induced by N-nitrosomorpholine in Sprague-Dawley rats.
Topics: Animals; Body Weight; Carcinogens; Cyclic AMP; DNA, Neoplasm; Isoproterenol; Liver; Liver Neoplasms; Liver Neoplasms, Experimental; Male; Nitrosamines; Organ Size; Rats; Rats, Sprague-Dawley | 1993 |
Isoenzyme shift from glucokinase to hexokinase is not an early but a late event in hepatocarcinogenesis.
Topics: Adenoma, Liver Cell; Animals; Carcinogens; Carcinoma, Hepatocellular; Glucokinase; Hexokinase; Liver Neoplasms; Male; Nitrosamines; Precancerous Conditions; Rats; Rats, Sprague-Dawley; Time Factors | 1993 |
Ha-ras mutations in N-nitrosomorpholine-induced lesions and inhibition of hepatocarcinogenesis by antisense sequences in rat liver.
Topics: Animals; Base Sequence; Carcinoma, Hepatocellular; Evaluation Studies as Topic; Genes, ras; Injections, Intraperitoneal; Liver Neoplasms; Male; Mutation; Nitrosamines; Oligonucleotides, Antisense; Point Mutation; Precancerous Conditions; Rats; Rats, Sprague-Dawley | 1997 |
Initiated rat hepatocytes in primary culture: a novel tool to study alterations in growth control during the first stage of carcinogenesis.
Topics: Animals; Cell Division; Cells, Cultured; Cyproterone Acetate; DNA; Glutathione Transferase; Liver; Liver Neoplasms; Male; Nitrosamines; Phenobarbital; Phenotype; Precancerous Conditions; Rats; Rats, Wistar; Transforming Growth Factor beta | 2000 |
Establishment of an in vivo highly metastatic rat hepatocellular carcinoma model.
Topics: Animals; Cadherins; Carcinogens; Carcinoma, Hepatocellular; Diethylnitrosamine; Disease Models, Animal; Immunohistochemistry; Liver Neoplasms; Lung Neoplasms; Male; Nitrosamines; Rats; Rats, Inbred F344 | 1999 |
In vivo electroporetic transfer of bcl-2 antisense oligonucleotide inhibits the development of hepatocellular carcinoma in rats.
Topics: Animals; Antineoplastic Agents; Apoptosis; Blotting, Northern; Carcinogens; Carcinoma, Hepatocellular; Drug Carriers; Drug Delivery Systems; Liposomes; Liver Neoplasms; Male; Nitrosamines; Oligonucleotides, Antisense; Proto-Oncogene Proteins c-bcl-2; Rats; Rats, Sprague-Dawley | 2000 |
A model for hepatocarcinogenesis with clonal expansion of three successive phenotypes of preneoplastic cells.
Topics: Animals; Carcinogens; Cell Transformation, Neoplastic; Likelihood Functions; Liver Neoplasms; Male; Models, Biological; Nitrosamines; Numerical Analysis, Computer-Assisted; Phenotype; Precancerous Conditions; Rats; Rats, Sprague-Dawley | 2000 |
Application of fine-needle aspiration biopsy for the diagnosis of dysplastic and neoplastic liver cell changes induced by N-nitrosomorpholine in rats.
Topics: Animals; Biopsy, Needle; Carcinogens; gamma-Glutamyltransferase; Liver; Liver Neoplasms; Male; Morpholines; Nitrosamines; Rats; Rats, Inbred Strains; Time Factors | 1979 |
The effect of estradiol-17-phenylpropionate and estradiol benzoate on N-nitrosomorpholine-induced liver carcinogenesis in ovariectomized female rats.
Topics: Animals; Carcinoma, Hepatocellular; Castration; Contraceptives, Oral; Drug Synergism; Estradiol; Female; Liver Neoplasms; Morpholines; Neoplasms, Experimental; Nitrosamines; Ovary; Rats | 1978 |
Foci of altered hepatocytes induced in embryonal turkey liver.
Topics: Animals; Glucosephosphate Dehydrogenase; Glycogen; Liver; Liver Neoplasms; Nitrosamines; Precancerous Conditions; Turkeys; Urethane | 1992 |
Site-specific hypomethylation of c-myc protooncogene in liver nodules and inhibition of DNA methylation by N-nitrosomorpholine.
Topics: Animals; Deoxycytidine; DNA Modification Methylases; DNA, Bacterial; DNA, Neoplasm; Liver Neoplasms; Male; Methylation; Nitrosamines; Precancerous Conditions; Proto-Oncogenes; Rats; Rats, Inbred Strains; RNA, Neoplasm | 1991 |
DNA synthesis, apoptosis, and phenotypic expression as determinants of growth of altered foci in rat liver during phenobarbital promotion.
Topics: Animals; Body Weight; Carcinogens; Cell Division; DNA Replication; Female; Liver; Liver Neoplasms; Nitrosamines; Organ Size; Phenobarbital; Phenotype; Precancerous Conditions; Rats; Rats, Inbred Strains; Thymidine | 1990 |
Enhancement of hepatocarcinogenesis in rats by dietary fructose.
Topics: Animals; Carcinogens; Dietary Carbohydrates; Fructose; gamma-Glutamyltransferase; Glucosephosphate Dehydrogenase; Liver; Liver Neoplasms; Liver Neoplasms, Experimental; Male; Nitrosamines; Rats; Rats, Inbred Strains | 1989 |
Comparative tumorigenicity of N-nitroso-2-hydroxymorpholine, N-nitrosodiethanolamine and N-nitrosomorpholine in A/J mice and F344 rats.
Topics: Adenocarcinoma; Animals; Carcinogens; Diethylnitrosamine; Female; Hemangiosarcoma; Liver Neoplasms; Liver Neoplasms, Experimental; Lung Neoplasms; Mice; Mice, Inbred A; Neoplasms, Experimental; Nitrosamines; Rats; Rats, Inbred F344; Species Specificity; Structure-Activity Relationship; Thyroid Neoplasms | 1989 |
Morphometric study of alterations of extrafocal hepatocytes of rat liver treated with N-nitrosomorpholine.
Topics: Animals; Carcinogens; Cell Nucleus; Liver; Liver Neoplasms; Male; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains; Time Factors | 1987 |
Enzyme histochemical and morphological phenotype of amphophilic foci and amphophilic/tigroid cell adenomas in rat liver after combined treatment with dehydroepiandrosterone and N-nitrosomorpholine.
Topics: Animals; Carcinogens; Dehydroepiandrosterone; Drug Interactions; Liver; Liver Neoplasms; Male; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1988 |
Phenotypic modulation of hepatocarcinogenesis and reduction in N-nitrosomorpholine-induced hemangiosarcoma and adrenal lesion development in Sprague-Dawley rats by dehydroepiandrosterone.
Topics: Adenoma; Adrenal Cortex Diseases; Animals; Dehydroepiandrosterone; Hemangiosarcoma; Liver Neoplasms; Liver Neoplasms, Experimental; Mitotic Index; Nitrosamines; Rats | 1988 |
Loss of adenylate cyclase activity in preneoplastic and neoplastic lesions induced in rat liver by N-nitrosomorpholine.
Topics: Adenylyl Cyclase Inhibitors; Animals; Cholera Toxin; Colforsin; Glucagon; Glucosephosphate Dehydrogenase; Liver; Liver Neoplasms; Male; Microscopy, Electron; Nitrosamines; Precancerous Conditions; Rats; Rats, Inbred Strains | 1986 |