Download or read book Short Term Test Systems for Detecting Carcinogens written by K.H. Norpoth and published by Springer Science & Business Media. This book was released on 2012-12-06 with total page 424 pages. Available in PDF, EPUB and Kindle. Book excerpt: The varying cancer incidence from country to country and region to region suggests that en vironmental factors play a considerable role in the aetiology of cancer. Whether these factors in the environment moderate the effect of car cinogenic chemicals or whether they might them selves be carcinogenic is not known at the present time. What is known is that there are various chemicals, both naturally occurring and man-made, which can induce cancer in man. In the Western world estimates vary as to how much cancer is occupational in origin; the figures range from 1% to 40%. It is our feeling that probably about 10% of cancer has a direct oc cupational origin. Nevertheless this number is considerable and it behoves us therefore to identify those chemicals which are carcinogenic and to reduce human exposure. Recent work on the mode of action of carcinogenic chemicals suggests that the majority exert their effect through an activation step to give elec trophilic metabolites. Such metabolites have as a common feature the ability to react with cel lular nucleophiles to give covalently bound products. Such reaction will occur after carcino gen treatment of animals with nucleic acids par ticularly in target organs. It is reaction with nucleic acids that provides the basis of a num ber of short-term tests for carcinogens, since the basic composition of DNA is similar in micro-organisms and in human cells.

Download or read book Short Term Test Systems for Detecting Carcinogens written by K H Norpoth and published by . This book was released on 1980-06-01 with total page 436 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book SHORT TERM TEST SYSTEMS FOR DETECTING CARCINOGENS written by KH NORPOTH (Ed) and published by . This book was released on 1980 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Short Term Tests for Chemical Carcinogens written by H.F. Stich and published by Springer. This book was released on 2011-10-08 with total page 518 pages. Available in PDF, EPUB and Kindle. Book excerpt: The recent surge of interest in designing, validating, and implementing short-term tests for carcinogens has been spurred by the fairly convincing correlation be tween the carcinogenicity and mutagenicity of chemicals and physical agents and by the assumption that DNA alteration, mutations, and chromosome aberrations are somehow involved in neoplastic transformation. Moreover, it has been tacitly assumed that the mutagenic capacity alone of compounds would induce regulatory agencies to pass rules for their removal from the environment and would lead the public to avoid them. The actual response, however, is quite different. Governmental departments shy away from making any decisions on the basis of in vitro test systems. The public at large is becoming irritated by daily an nouncements that many of their cherished habits could adversely affect their health. Industry appears to feel threatened and may reduce its search for new beneficial chemicals. The reluctance to accept wholeheartedly the mutagenicity tests for the detection of carcinogens is partly due to uncertainty about the in volvement of mutations in neoplastic transformation, partly due to the present difficulty of extrapolating results from various endpoints obtained on numerous organisms to man, and partly due to a multitude of complex events that lead in vivo to the evolvement of benign or malignant tumors.

Download or read book Review of Short term Screening Tests for Mutagens Toxigens and Carcinogens written by Heath J. Carney and published by . This book was released on 1979 with total page 78 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Evaluation of Short term Tests for Carcinogens written by Frederick J. De Serres and published by North-Holland. This book was released on 1981 with total page 854 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Short term Tests for Carcinogens Mutagens and Other Genotoxic Agents written by Anne Trontell and published by . This book was released on 1979 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book The Predictive Value of Short term Screening Tests in Carcinogenicity Evaluation written by and published by Elsevier-North-Holland Biomedical Press. This book was released on 1980 with total page 366 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book ICRDB Cancergram written by and published by . This book was released on 1986 with total page 32 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Selected Abstracts on Short term Test Systems for Potential Mutagens and Carcinogens Microbial tests written by and published by . This book was released on 1981 with total page 136 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Use of Short Term Test Systems for the Prediction of Hazard Represented by Potential Chemical Carcinogens written by Larry Ronald Glass and published by . This book was released on 1987 with total page 458 pages. Available in PDF, EPUB and Kindle. Book excerpt: The data were evaluated in a format which allowed for a comparison of the ranking of the mutagenic relative potencies of the compounds (as estimated using short term data) vs. the ranking of the tumorigenic relative potencies (as estimated from the chronic bioassays). The results were statistically significant (p $

Download or read book The Use of Short and Medium term Tests for Carcinogens and Data on Genetic Effects in Carcinogenic Hazard Evaluation written by D. McGregor and published by . This book was released on 1999 with total page 548 pages. Available in PDF, EPUB and Kindle. Book excerpt: Lifetime assays for carcinogenicity in experimental animals, together with data on genetic and related effects on a variety of organisms, have long been the foundation for predictions of carcinogenic hazard to human beings. Recent scientific advances have provided new assays and novel test systems that are beginning to supplement, and in the future may even replace, the well-established tests that have been widely used for the last four decades. This publication reviews the evidence that justifies the use of lesions that precede histologically defined malignancy as endpoints to predict carcinogenicity. It evaluates the utility of non-mammalian species and of genetically engineered rodents as subjects for carcinogenicity tests and mutations in cancer-related genes in human and experimental animal tumours as 'footprints' of environmental carcinogens. It evaluates the use of established and novel assays for genetic toxicity in the prediction of carcinogenicity. Finally it formulates recommendations on the use of such data in the process of evaluation of carcinogenic hazards by the IARC Monographs on the Evaluation of Carcinogenic Risks to Humans.

Download or read book Selected Abstracts on Short term Test Systems for Potential Mutagens and Carcinogens written by and published by . This book was released on 1981 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book In Vitro Transformation written by Gary M. Williams and published by . This book was released on 1982 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Carcinogens and Anticarcinogens in the Human Diet written by National Research Council and published by National Academies Press. This book was released on 1996-02-12 with total page 433 pages. Available in PDF, EPUB and Kindle. Book excerpt: Despite increasing knowledge of human nutrition, the dietary contribution to cancer remains a troubling question. Carcinogens and Anticarcinogens assembles the best available information on the magnitude of potential cancer riskâ€"and potential anticarcinogenic effectâ€"from naturally occurring chemicals compared with risk from synthetic chemical constituents. The committee draws important conclusions about diet and cancer, including the carcinogenic role of excess calories and fat, the anticarcinogenic benefit of fiber and other substances, and the impact of food additive regulation. The book offers recommendations for epidemiological and diet research. Carcinogens and Anticarcinogens provides a readable overview of issues and addresses critical questions: Does diet contribute to an appreciable proportion of human cancer? Are there significant interactions between carcinogens and anticarcinogens in the diet? The volume discusses the mechanisms of carcinogenic and anticarcinogenic properties and considers whether techniques used to evaluate the carcinogenic potential of synthetics can be used with naturally occurring chemicals. The committee provides criteria for prioritizing the vast number of substances that need to be tested. Carcinogens and Anticarcinogens clarifies the issues and sets the direction for further investigations into diet and cancer. This volume will be of interest to anyone involved in food and health issues: policymakers, regulators, researchers, nutrition professionals, and health advocates.

Download or read book Use of Short term Test Systems for the Prediction of the Hazard Represented by Potential Chemical Carcinogens written by and published by . This book was released on 1990 with total page 129 pages. Available in PDF, EPUB and Kindle. Book excerpt: It has been hypothesized that results from short-term bioassays will ultimately provide information that will be useful for human health hazard assessment. Historically, the validity of the short-term tests has been assessed using the framework of the epidemiologic/medical screens. In this context, the results of the carcinogen (long-term) bioassay is generally used as the standard. However, this approach is widely recognized as being biased and, because it employs qualitative data, cannot be used to assist in isolating those compounds which may represent a more significant toxicologic hazard than others. In contrast, the goal of this research is to address the problem of evaluating the utility of the short-term tests for hazard assessment using an alternative method of investigation. Chemicals were selected mostly from the list of carcinogens published by the International Agency for Research on Carcinogens (IARC); a few other chemicals commonly recognized as hazardous were included. Tumorigenicity and mutagenicity data on 52 chemicals were obtained from the Registry of Toxic Effects of Chemical Substances (RTECS) and were analyzed using a relative potency approach. The data were evaluated in a format which allowed for a comparison of the ranking of the mutagenic relative potencies of the compounds (as estimated using short-term data) vs. the ranking of the tumorigenic relative potencies (as estimated from the chronic bioassays). Although this was a preliminary investigation, it offers evidence that the short-term tests systems may be of utility in ranking the hazards represented by chemicals which may contribute to increased carcinogenesis in humans as a result of occupational or environmental exposures. 177 refs., 8 tabs.

Download or read book Long term and Short term Assays for Carcinogens written by International Program on Chemical Safety and published by . This book was released on 1986 with total page 596 pages. Available in PDF, EPUB and Kindle. Book excerpt: This volume contains the papers presented at a meeting held in December 1985 to review the conduct and use of long- and short- term assays for the detection of chemical carcinogens. The meeting was attended by about 60 experts in the fields of carcinogenesis, mutagenesis, and cell biology. The series of reports on long-term carcinogenicity assays pay particular attention to three topics: the role of pharmacokinetic data, early preneoplastic lesions in carcinogenesis, and the possibility for discerning the relative contribution of carcinogens to various stages of carcinogenesis. The reports on short-term assays summarize, among other points, the principle and scientific basis of each assay and its relevance to carcinogen detection and to the multistage process of carcinogenesis.