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Landmark studies assess risk of exposure to elevated levels of EMS confirm clear toxicity threshold
Date:8/4/2008

odel - the largest study of its kind ever conducted

  • Modelling of exposure and metabolism of EMS in humans based on experimental animal data

The first study clearly demonstrated a threshold-dose response with no chromosomal damage at EMS doses up to and including, 80 mg/kg/day. The second set of studies, the transgenic MutaMouse studies, also showed a clear threshold effect for mutations above 25 mg/kg/day, under chronic conditions. Effects were also shown not to be cumulative over time. This threshold is far above 0.055 mg/kg/day -- the highest estimated levels to which Viracept patients were exposed for no longer than 3-6 months.

The research team used these results to predict human exposure to EMS. They predicted that even at a maximal exposure level 370-fold higher than that calculated for affected Viracept patients, the damage potentially incurred by EMS can still effectively be dealt with by ubiquitous DNA repair mechanisms. As chromosome damage and mutations are the underlying molecular events for birth defects and cancer, the results of these studies can be used to reassure patients exposed to elevated levels of EMS, and their healthcare providers, that they are not at increased risk for developing cancer.


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Contact: Sbastien Desprez
sebastien.desprez@ketchum.com
44-077-682-38289
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Source:Eurekalert

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