Research Article

B7-H4 Expression Is Associated with Tumor Progression and Prognosis in Patients with Osteosarcoma

Figure 2

The levels of circulating sB7-H4 in the serum of OS patients and healthy controls were measured by ELISA. Mean concentration of sB7-H4 in patients with OS was significantly higher than that in healthy volunteers ( ng/mL versus  ng/mL, ).