Objective To investigate the correlations of serum osteopontin(OPN) level with clinical characteristics and prognosis of primary systemic amyloidosis(AL). Methods In this study, 60 patients with AL(AL group) treated in our hospital between March 2005 and March 2015 were enrolled. The OPN levels in the AL patients with different clinical features were analyzed. Meanwhile, 60 healthy subjects having health examination during the same period were selected as the control group. The levels of OPN and troponin t(...