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Cancer incidence among merchant seafarers: an extended follow-up of a Danish cohort
  1. Kajsa Ugelvig Petersen1,
  2. Julie Volk1,
  3. Linda Kaerlev2,3,
  4. Henrik Lyngbeck Hansen4,
  5. Johnni Hansen1
  1. 1 The Danish Cancer Society Research Center, The Danish Cancer Society, Copenhagen, Denmark
  2. 2 Institute of Clinical Research, University of Southern Denmark, Odense, Denmark
  3. 3 Center for Clinical Epidemiology, Odense University Hospital, Odense, Denmark
  4. 4 Supervision and Guidance South, The Danish Patient Safety Authority, Kolding, Denmark
  1. Correspondence to Kajsa Ugelvig Petersen, The Danish Cancer Society Research Center, The Danish Cancer Society, Copenhagen, 2100, Denmark; kajpet{at}cancer.dk

Abstract

Objectives While maritime safety generally has improved dramatically over the last century, modern seafarers are still faced with numerous occupational hazards potentially affecting their risk of chronic diseases such as cancer. The aim of this study is to offer updated information on the incidence of specific cancers among both male and female seafarers.

Methods Using records from the Danish Seafarer Registry, all seafarers employed on Danish ships during 1986–1999 were identified, resulting in a cohort of 33 084 men and 11 209 women. Information on vital status and cancer was linked to each member of the cohort from the Danish Civil Registration System and the Danish Cancer Registry using the unique Danish personal identification number. SIRs were estimated for specific cancers using national rates.

Results The overall incidence of cancer was increased for both male and female seafarers (SIR 1.19, 95% CI 1.15 to 1.23, and SIR 1.14, 95% CI 1.07 to 1.22) compared with the general population. This excess was primarily driven by increases in gastrointestinal, respiratory and genitourinary cancers. In addition, male seafarers working in areas with asbestos exposure showed significantly increased risk of mesothelioma. Finally, the male seafarers had an increased risk of lip cancer.

Conclusions The majority of cancers among seafarers continue to be lifestyle-related. However, occupational exposure to asbestos and ultraviolet radiation seems to affect the cancer pattern among the male seafarers as well.

  • seafarers
  • cancer
  • cohort
  • occupational exposure

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Footnotes

  • Contributors KUP designed the study, performed programming and analyses, participated in interpretation of results and the writing of the manuscript. JV designed the study, participated in analyses and interpretation of results and the writing of the manuscript. LK designed the study, collected the original data, supervised interpretation of results and revised the manuscript critically. HLH designed the study, categorised exposure data, supervised interpretation of results and revised the manuscript critically. JH was a major contributor in designing the study and supervised all subsequent data collection, programming and analyses, participated in interpretation of results and supervised writing of the manuscript. Responsible for guaranteeing the overall content. All authors read and approved the final manuscript.

  • Competing interests None declared.

  • Patient consent Not required.

  • Provenance and peer review Not commissioned; externally peer reviewed.

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