“…This level is lower than in other studies [15,16], but is in accordance with other published data [17]. Nevertheless, SMRP concentration in the serum of subjects with past exposure to asbestos shows a wide variation according to different authors [9,18,19,20,21,22,23]. In addition, different cut-off levels for abnormality have been proposed (from 0.9 to 2.5 nmol) [14,15,17,19,24,25,26,27,28,29,30,31,32].…”