Evidence of a paradoxical relationship between endotoxin and lung cancer after accounting for left truncation in a study of Chinese female textile workers

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• Personal Author:
  Applebaum KM ; Astrakianakis G ; Checkoway, Harvey ; Christiani, David C. ; Eisen EA ; Gao DL ; LaValley MP ; Li W ; Ray RM ; Thomas DB
• Description:
  Introduction: Occupational exposure to endotoxin, found in Gram-negative bacteria in organic material, has been associated predominantly with a reduced risk of lung cancer among workers. An inverse exposure-response gradient among women textile workers in Shanghai, China, has been reported previously. In this case-cohort study, we investigated the influence of left truncation, which can itself induce a downward trend, on the observed association. Methods: Subjects were enrolled between 1989 and 1991 and followed until 1998. The data were left-truncated as all subjects were hired before baseline. An analysis was performed with 3038 subcohort members and 602 cases of incident lung cancer. To evaluate left truncation, we compared lung cancer rates in those hired longer ago with those hired more recently among unexposed subjects. Cox proportional hazards modelling was used to estimate incident rate ratios (IRRs) and 95% CIs. Results: Among those who were never exposed to workplace endotoxin, we compared lung cancer rates in those hired >35 years before enrolment with workers hired ≤ 35 years before enrolment and observed a reduced risk in the former group, IRR=0.74, 95% CI (0.51 to 1.07). After accounting for this downward bias from left truncation, the reduced risk associated with endotoxin remained among those hired ≤ 50 years before enrolment. In contrast, there was suggestion of an increased risk of lung cancer among those hired >50 years ago. Conclusions: After examination of left truncation bias, an inverse dose-response between endotoxin and lung cancer remained for all subjects except those hired longest ago. [Description provided by NIOSH]
• Subjects:
  Cohort Studies Dust Endotoxins Epidemiology Lung Lung Diseases Neoplasms Occupational Health Respiratory System Respiratory Tract Diseases Safety Textile Industry Women

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• Keywords:
  Cohort Studies Long Term Study Lung Cancer Organic Dusts Textiles Textile Workers
• ISSN:
  1351-0711
• Document Type:
  Text
• Funding:
  Grant
• Genre:
  Journal Article
• Place as Subject:
  California ; Massachusetts ; OSHA Region 1 ; OSHA Region 10 ; OSHA Region 9 ; Washington
• CIO:
  National Institute for Occupational Safety and Health (NIOSH)
• Topic:
  Workplace Safety & Health
• Location:
  North America
• Volume:
  70
• Issue:
  10
• NIOSHTIC Number:
  nn:20043326
• Citation:
  Occup Environ Med 2013 Oct; 70(10):709-715
• Contact Point Address:
  Dr. Katie M. Applebaum, Department of Epidemiology, Boston University School of Public Health, 715 Albany St., T322E, Boston, MA 02118, USA
• Email:
  kappleba@bu.edu
• Federal Fiscal Year:
  2014
• Performing Organization:
  Boston University Medical Campus
• Peer Reviewed:
  True
• Start Date:
  20080801
• Source Full Name:
  Occupational and Environmental Medicine
• End Date:
  20130731
• Collection(s):
  National Institute for Occupational Safety and Health
• Main Document Checksum:
  urn:sha-512:c223ac0d7750105085f8a8f8019942a8851324d2243bd1cc4037cc76efd985c48c57e0adb72c549177b14ae0ba42592fc0976d8acf7eadf66bc32180a682310e
• Download URL:
  https://stacks.cdc.gov/view/cdc/195249/cdc_195249_DS1.pdf
• File Type:
  [PDF - 134.78 KB ]