Imputation of individual cancer cases to occupational causes.
OBJECTIVE
Many potential occupational causes of cancer have been documented. Imputation of an individual cancer to occupational or other causes is, however, difficult. A method based on the Bayes theorem is proposed for assessing causal relationships at the individual level.


METHODS
Causality assessment, dealing with four types of persons defined by exposure and the occurrence of cancer, was linked with imputation, only dealing with persons who have cancer and were exposed. Imputation was then formulated using the Bayes theorem, relating epidemiologic information regarding causes, a patient's exposure history, and the posterior odds that the cancer was caused by a suspected occupational exposure. Data needed to apply a Bayesian method were defined in terms of relative risks, proportion of people exposed in populations, and the frequency of a positive relevant characteristic for persons without cancer. A relevant characteristic was defined using a formal consensus between experts. The method was then illustrated with cases of mesothelioma and lung cancer in possible relation to asbestos.


RESULTS
Experts defined the relevant characteristics as being qualification of occupational exposure, intensity of exposure, latency, disease characteristics, and presence of causal agent in the body. Application to mesothelioma and lung cancer cases illustrated the potential usefulness of the method.


CONCLUSIONS
The importance of occupational exposure in the formulation of imputation underscores the need for available and reliable data sources on occupational exposures. The proposed method could become a powerful tool for the expert assessment of causes of cancer cases, provided data become available in individual files and the literature.
Vandentorren
Stéphanie
S
Laboratoire Santé Travail Environnement (EA 3672, IFR-99 Santé Publique), Université Victor Segalen Bordeaux 2, Bordeaux, France.
Salmi
L Rachid
LR
Mathoulin-Pélissier
Simone
S
Baldi
Isabelle
I
Brochard
Patrick
P
D000368:Aged; D000395:Air Pollutants, Occupational; D001499:Bayes Theorem; D005104:Expert Testimony; D006801:Humans; D008175:Lung Neoplasms / Q000209:etiology*; D008297:Male; D008654:Mesothelioma / Q000209:etiology*; D008875:Middle Aged; D008954:Models, Biological; D009784:Occupational Diseases / Q000175:diagnosis*; D016273:Occupational Exposure
D000395:Air Pollutants, Occupational