Abstract
Many genetic polymorphisms in metabolism enzymes are important for the risk of cancer as shown in a large number of case-control studies. The relative risk estimates have shown large variations between such population studies. However, in most studies the relative risk estimates are in the range of 2. Some polymorphisms are effect modifiers, i.e. without exposure they have no consequence and the effect of exposure can appear independent of the genotype. Genetic polymorphisms in metabolism of environmental toxicants plays a significant role in exposures to traffic generated air pollution in Copenhagen, revealing statistically significant higher levels of chromosomal aberrations in non-smoking bus drivers with glutathion- S-transferase M1, GSTM1 null and N-acetyltransferase 2, NAT2 slow genotypes. Combined with cohort studies showing positive associations between high chromosomal levels and increased cancer risk, such results indicate effect modification regarding cancer risk. In risk assessment the safety ‘factor’ of 10 is generally accepted to allow for variation in individual susceptibility. Reviewing the literature justifies the factor of 10 when considering single polymorphisms. However in an individual with several susceptible metabolism genotypes as well as other determinants of susceptibility, e.g. defective DNA repair, poor-nutritional state, etc. the risk may increase far above a safety of 10. Historically, genetic polymorphisms have been taken into consideration in employment and currently the application in insurance situations is criticised.
Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callMore From: Mutation Research - Fundamental and Molecular Mechanisms of Mutagenesis
Disclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
