Between causes of occupational sinonasal cancers there could be previous expositions to wood and leather dusts, nickel, chromium, formaldehyde, polycyclic aromatic hydrocarbons. What relationship could be there between these neoplasm and work in primary school teachers? We're thinking biological agents (carcinogens virus as Epstain-Barr virus) with high tropism for rhinopharyngeal area) or gypsum particles (local effect of water-soluble sulfates): what do you think about?