[Safety assurance for occupational tumors in agriculture].

Cancer risk in farming is characterized by:-multiple exposure varying in time, space and between crops;-poor knowledge of agrochemical used by workers;-interset of both sellers and users mainly or acute toxicity of pesticides;-availibility of sufficient evidence of carcinogenicity in humans only for arsenical insecticides and for benzene used as solvent. The frequency of both claims for compensation and recognized cased is extremely low. Referral to exper agronomists operations in the area of interest can turn out to be of great value in assessing exposures. In case of exposure to carcinogenic agents defined as possible or probable, the following criteria may be adopted:-duration of exposure and latency time in agreement with findings from scientific literature;-biological plausibility of the association of interest;-evaluation of the interaction in the frame of multiple exposure, with special reference to the role of brief and/or low exposures. The above mentioned items are discussed by examining practical cases.