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Comparison of serum EFEMP1 level between pre- and postsurgical OS patients. (a) The serum EFEMP1 level of OS patients < 4 weeks after surgery was significantly higher than that before surgery (P < 0.001). (b) The serum EFEMP1 level of OS patients > 4 weeks after surgery was significantly higher than that before surgery (P < 0.001). (c) The serum EFEMP1 level of OS patients < 4 weeks after surgery was significantly higher than that >4 weeks after surgery (P = 0.012).
