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Y. Zhang



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    O18 - Cancer Control and Epidemiology II (ID 133)

    • Event: WCLC 2013
    • Type: Oral Abstract Session
    • Track: Prevention & Epidemiology
    • Presentations: 1
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      O18.07 - A Retrospective Cohort Mortality Study in Jingchuan of china - the Largest Nickel Population in World (ID 94)

      11:35 - 11:45  |  Author(s): Y. Zhang

      • Abstract

      Background
      Nickel is an essential trace metal used in the occupational setting and is naturally found in the general environment, resulting in both occupational and nonoccupational exposures to individuals at varying levels. Exposure to nickel has been associated with several toxicites and the International Agency for Research on Cancer has concluded that there is sufficient evidence in humans associating exposure to nickel or nickel compounds with risk of lung cancer. We evaluated overall and cause-specific mortality among Chinese workers involved in nickel production or utilization in order to examine the long-term health effects of occupational exposure to nickel compounds.

      Methods
      The study design was a retrospective cohort mortality study including 432,526 workers who were involved with nickel mining or smelt between 2001 and 2010. We calculated standardized mortality ratios (SMR) using the death rates of Gansu Province in China, and estimated by the exact probabilities of the Poisson distribution.

      Results
      Overall, the all-cause mortality was decreased in all workers compared to the general population of Gansu province (SMR= 0.53, 95%CI: 0.51-0.55). Analyses examining cause-specific mortality revealed an increase in the mortality from bronchogenic carcinoma and lung cancer (SMR = 2.05, 95% CI = 1.84-2.29), cor pulmonale (SMR =4.08, 95% CI = 3.25-5.01), and silicosis (SMR = 13.59, 95%CI =11.90-15.52) in the workers exposed to nickel.

      Conclusion
      This study confirmed a significant excess of mortality from diseases of the lung including silicosis , lung cancer, and cor pulmonale among workers involved in nickel mining or smelt in China.