A 2004 paper in the journal Environmental Health Perspectives reported that this included 28 definite, 27 probable and 113 possible human occupational carcinogens. By contrast, the influential 1981 Doll/Peto paper, which for over two decades was the most commonly cited estimate of the contribution of occupation to cancer incidence, only considered cancer risks posed by a list of 16 substances or industries. The report notes the (now widely cited) “tables should be useful for regulatory or preventive purposes and for scientific purposes in research priority setting and in understanding carcinogenesis.

Siemiatycki J, Richardson L, Straif K and others. Listing occupational carcinogens. Environmental Health Perspectives, volume 112, number 15, pages 1447-1459, 2004.