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Intake of marine food is the main source of butyltin exposure in humans. Health effects following exposure to butyltin compounds are usually in the immune system, but endocrine effects of butyltin from a variety of marine species have been documented. The information on human exposure to butyltin compounds and hepatic deposition is limited. The present study include 18 consecutively sampled human livers analyzed for butyltin compounds. Dibutyltin (DBT) concentrations varied between 0.8 and 28.3 ng/g with a mean concentration of 9.0 ng/g. Significantly lower concentrations of monobutyltin (MBT) were observed, ranging from 0.3 to 4.7 ng/g with a mean value of 1.6 ng/g. Age and DBT/MBT ratio were significantly associated. We suggest that younger men have more recent exposures or have a lower capacity to debutylate DBT than older men and would therefore potentially be more susceptible to butyltin …