Risk Assessment for Toluene Diisocyanate and Respiratory Disease Human Studies

Details

• Personal Author:
  Park RM
• Description:
  Background: Toluene diisocyanate (TDI) is a highly reactive chemical that causes sensitization and has also been associated with increased lung cancer. A risk assessment was conducted based on occupational epidemiologic estimates for several health outcomes. Methods: Exposure and outcome details were extracted from published studies and a NIOSH Health Hazard Evaluation for new onset asthma, pulmonary function measurements, symptom prevalence, and mortality from lung cancer and respiratory disease. Summary exposure-response estimates were calculated taking into account relative precision and possible survivor selection effects. Attributable incidence of sensitization was estimated as were annual proportional losses of pulmonary function. Excess lifetime risks and benchmark doses were calculated. Results: Respiratory outcomes exhibited strong survivor bias. Asthma/sensitization exposure response decreased with increasing facility-average TDI air concentration as did TDI-associated pulmonary impairment. In a mortality cohort where mean employment duration was less than 1 year, survivor bias pre-empted estimation of lung cancer and respiratory disease exposure response. Conclusion: Controlling for survivor bias and assuming a linear dose-response with facility-average TDI concentrations, excess lifetime risks exceeding one per thousand occurred at about 2 ppt TDI for sensitization and respiratory impairment. Under alternate assumptions regarding stationary and cumulative effects, one per thousand excess risks were estimated at TDI concentrations of 10 - 30 ppt. The unexplained reported excess mortality from lung cancer and other lung diseases, if attributable to TDI or associated emissions, could represent a lifetime risk comparable to that of sensitization. [Description provided by NIOSH]
• Subjects:
  Asthma Asthma, Occupational Epidemiology Hypersensitivity Isocyanates Lung Lung Diseases Mortality Neoplasms Occupational Health Respiratory System Respiratory Tract Diseases Safety Toluene

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• Keywords:
  Author Keywords: Asthma Diisocyanates Health Hazard Evaluations Lung Cancer Mortality Rates Pulmonary Function Respiratory System Disorders Sensitization Survivor Bias Toluene Diisocyanate
• ISSN:
  2093-7911
• Document Type:
  Text
• Genre:
  Journal Article
• Place as Subject:
  Ohio ; OSHA Region 5
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Division:
  DSI - Division of Science Integration
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Pages in Document:
  174-183
• Volume:
  12
• Issue:
  2
• NIOSHTIC Number:
  nn:20061859
• Citation:
  Saf Health Work 2021 Jun; 12(2):174-183
• Contact Point Address:
  R. M. Park, Centers for Disease Control and Prevention, National Institute for Occupational Safety and Health (NIOSH), 1090 Tusculum Ave, MS C-15, Cincinnati, OH, 45226-1998, USA
• Email:
  rhp9@cdc.gov
• CAS Registry Number:
  Toluene diisocyanate (CAS RN 26471-62-5)
• Federal Fiscal Year:
  2021
• Peer Reviewed:
  True
• Source Full Name:
  Safety and Health at Work
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:15ca95f769d7be859d29ea99f8d2cc91c0aeff2f8789ec72250dcea04cf443b39d7af79a33d970932a8a98b016e8a91450fb4c790dd51b194851f5d257032c31
• Download URL:
  https://stacks.cdc.gov/view/cdc/225219/cdc_225219_DS1.pdf
• File Type:
  [PDF - 675.05 KB ]