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PubMed1984

Biological monitoring of occupational exposure to nickel.

Biological monitoring and hygienic monitoring complement each other in assessing occupational exposure to nickel. Biological monitoring is mainly directed to following the exposure of individual workers. In order to estimate exposure from data on biological monitoring, the exposing agent, i.e., the chemical species of nickel involved must be known. Comparisons between exposures are most reliable when made under similar exposure conditions. In particular, when urine is monitored, contamination of the sample from the dust in the air, workers' clothes, and hands, is a major problem. The sampling time must be standardized. At present, no clear-cut preference can be given to plasma rather than urine or vice versa. With the exception of nickel carbonyl poisoning, no health risk estimation can be performed based on the results of biological monitoring. Cytogenetic methods do not seem appropriate for assessing risk or exposure. The increase in chromosome gaps reported in one study seems to indicate the need for further research.

Adult↗
PubMed1984

Nickel and cancer associations from a multicancer occupation exposure case-referent study: preliminary findings.

Since 1979 our group has been engaged in a case-referent study of 12 tumour types (oesophagus, stomach, colon, rectum, liver, pancreas, lung, melanoma of skin, prostate, bladder, kidney, lymphoid tissue) and occupational exposure. The study covers the entire Montreal population of males aged 35-70; cases are ascertained in all major hospitals. The interview concerns various sociodemographic variables and a detailed job history. Each job history is evaluated by a team of chemists who infer for each job what the possible physical and chemical exposures were. The list of exposures thus inferred is added to the subject's data file. Each site and each exposure noted in any patient's history are statistically evaluated for possible association. Until June 1982, 1 343 cancer cases and 144 general population subjects had been thus interviewed. For the present purpose, all 1 487 files were reviewed to assign exposure to nickel, and nickel exposure was attributed to 79 subjects. Mantel-Haenszel analyses were carried out comparing each site with a referent group consisting of all other interviewees (other sites and healthy controls). Only the nickel-lung association turned out to be remarkable, with an odds ratio of 3.1, 95% confidence limits 1.9-5.0, and some indication of dose-response effect. The risk was particularly high among stainless-steel welders, though other nickel-exposed workers were also at risk. These findings probably reflect a real risk; however, we cannot be certain that nickel is responsible. Exposure to chromium compounds was so highly correlated with nickel that the observed nickel association may simply have reflected a confounding effect of chromium. Confounding with other occupational exposures is also possible.

Adult↗