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Biliary tract cancer in male printers and typesetters in the European rare cancer case-control study
  1. Wolfgang Ahrens1,2,
  2. Franco Merletti3,
  3. Dario Mirabelli3
  1. 1Department of Epidemiological Methods and Etiologic Research, Leibniz Institute for Prevention Research and Epidemiology—BIPS, Bremen, Germany
  2. 2Faculty of Mathematics and Computer Science, Institute for Statistics, University of Bremen, Bremen, Germany
  3. 3Unit of Cancer Epidemiology, Department of Medical Sciences, University of Turin and Città della Scienza e della Salute Hospital, Turin, Italy
  1. Correspondence to Professor Franco Merletti, Epidemiologia dei Tumori, via Santena 7, Torino 10126, Italy; franco.merletti{at}unito.it

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Kumagai et al recently observed a striking increase in mortality from cholangiocarcinoma (CC) among workers in a colour proof-printing shop in Japan, based on six deaths among 11 CC cases in a group of 62 workers employed between 1991 and 2006. Exposure to 1,2-dichloropropane and dichloromethane was reported.1 Kubo et al extended the observation including 111 workers employed from 1981 to 2012, and reported 17 CC cases.2

The Nordic Occupational Cancer Study (NOCCA) was used to explore the generalisability of the Japanese cluster findings to the printing industry and related occupations at large.3 An overall standardised incidence ratio (SIR) of 2.34 (95% CI 95% CI 1.45 to 3.57) was found for intrahepatic CC, based on 21 cases in men. Women had an SIR of 1.95 (95% CI 0.84 to 3.85) with …

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