An update of vinyl chloride’s toxicological profile was released days after the Ohio train derailment. An expert told PolitiFact the update was in progress for months before the derailment and described the timing of the update as “purely coincidental.”
The agency employs a detailed process and complex formula to determine whether a toxicological profile needs updating.available on the agency’s website, the process involves examining the latest research and scoring studies based on how much they contribute to the understanding of the substance’s toxicology and risk assessment. That review yields a score that is used to prioritize the list of profiles to update.
PolitiFact got in touch with Dr. Ivan Rusyn, a K.C. Donnelly professor of veterinary physiology and pharmacology and chair of the Interdisciplinary Faculty of Toxicology program at Texas A&M University. Rusyn was one of three people listed as peer reviewers on the draft vinyl chloride profile. It takes up to a year for officials to appropriately adjust the content based on external comments, conduct other internal checks and finalize the profile, Rusyn said.
The profiles also discuss health effects in animals and humans at different exposures. In some instances, the effects of exposure include death. In the case of the vinyl chloride profile draft, such details appear to have fed misleading claims that the CDC changed vinyl chloride’s lethality.
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