Ms. Goldberg et al., A case-control study of the relationship between the risk of colon cancer in men and exposures to occupational agents, AM J IND M, 39(6), 2001, pp. 531-546
Background We conducted a population-based case-control study in Montreal,
Canada, to explore associations between hundreds of occupational circumstan
ces and several cancer sites, including colon.
Methods We interviewed 497 male patients with a pathologically confirmed di
agnosis of colon cancer, 1514 controls with cancers at other sites, and 533
population-based controls. Detailed job histories and relevant potential c
onfounding variables were obtained, and the job histories were translated b
y a team of chemists and industrial hygienists into a history of occupation
al exposures.
Results We found that there was reasonable evidence of associations for men
employed in nine industry groups (adjusted odds ranging from 1.1 to 1.6 pe
r a 10-year increase in duration of employment), and in 12 job groups (OR v
arying from 1.1 to 1.7). In addition, we found evidence of increased risks
by increasing level of exposures to 21 occupational agents, including polys
tyrene (OR for "substantial" exposure (ORsubst)=10.7), polyurethanes (ORsub
st=8.4), coke dust (ORsubst=5.6), mineral oils (ORsubst=3.3), polyacrylates
(ORsubst=2.8), cellulose nitrate (ORsubst=2.6), alkyds (ORsubst=2.5), inor
ganic insulation dust (ORsubst=2.3), plastic dusts (ORsubst=2.3), asbestos
(ORsubst=2.1), mineral wool fibers (ORsubst=2.1), glass fibers (ORsubst=2.0
), iron oxides ORsubst=1.9), aliphatic ketones (ORsubst=1.9), benzene (ORsu
bst=1.9), xylene (ORsubst=1.9), inorganic acid solutions (ORsubst=1.8), wax
es, polishes (ORsubst=1.8), mononuclear aromatic hydrocarbons (ORsubst=1.6)
, toluene (ORsubst=1.6), and diesel engine emissions (ORsubst=1.5). Not all
of these effects are independent because some exposures occurred contempor
aneously with others or because they referred to a group of substances.
Conclusions We have uncovered a number of occupational associations with co
lon cancer For most of these agents, there are no published data to support
or refute our observations. As there are few accepted risk factors for col
on cancel; we suggest that new occupational and toxicologic studies be unde
rtaken focusing on the more prevalent substances reported herein. Am. J. In
d. Med. 39:531-546, 2001. (C) 2001 Wiley-Liss, Inc.