“…Dose-response relationships have been observed in regard to duration of employment [Acheson et al, 1968;Bolm-Audorf et al, 1990;Luce et al, 1992;Magnani et al, 19931 and surrogate measures of intensity of exposure [Acheson et al, 1968;Hayes et al, 1986a;Luce et al, 19931. Particularly large excesses of sino-nasal adenocarcinoma have been observed [Acheson et al, 1968;Battista et al, 1983;Comba et al, 1992a;Hayes et al, 1986a;Luce et al, 1993;Magnani et al, 1993;Olsen and Asnaes, 19861. Smaller excesses of squamous cell sino-nasal cancer have also been observed [Elwood, 1981;Fukuda and Shibata, 1990;Hernberg et al, 1983;Shimizu et al, 1989;Vaughan and Davis, 1991;Voss et al, 19851, although some studies have not observed an excess risk [Brinton et al, 1984;Hayes et al, 1986a;Magnani et al, 1993;Olsen and Asnaes, 19861.…”