“…From 1963 to 1985 in Upsala, Sweden, 1,598 men with pleural plaques were studied and it was found that relevant risk of developing lung cancer amounted to 1.4% while 9 cases of mesothelioma were diagnosed, compared to the 0.8 expected [Hillerdal, 1994]. The kind of the fibers (amphibole group, especially tremolite) plays an important role not only in the appearance of pleural plaques but also of mesothelioma caused by asbestos environmental exposure [Sichletidis et al, 1992b;Dumortier et al, 2002].…”