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Silicosis is usually recognized at later stages of the disease, and early biomarkers for silicosis will be useful for timely diagnosis. We aimed at examining plasma levels of TNF-α and MMP-9, and correlation between these, in patients with different stages of silicosis in order to test suitability of these inflammatory factors as early biomarkers for silicosis. TNF-α and MMP-9 were quantified by ELISA in plasma specimens from 30 healthy individuals (control group), 28 individuals exposed topmid:26004615 fatcat:76y2rqrzsnfhdevu2zin5yz3w4