The AA. have scheduled a case-control study in order to assess the ambient hazards factors in these cancers, through the evaluation of its occupational risk. The program cover 242 cases of the epidermoid type of carcinoma (positive biopsy), and the group was parallelled with another group of 322 (after the age) admitted at the same Hospital, but affected with several processes. Were excluded the cancer of the lung, bladder, pancreas and kidney because of the causal link with tobacco smokers. In oral and pharyngeal cancer the AA. found out that the workers of high risk were butchers, blacksmiths, masons, drivers, electricians and railwaymen. Regarding the cancer of the larynx mechanics, plumbers, farmers, textile workers and drivers showed the greatest linkage. These findings are in accordance with those published in previous papers.