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Comparison of serum occludin levels between patients with brain tumors and healthy volunteers. Compared with healthy volunteers (n = 24), serum occludin levels in patients with brain tumors (n = 55) were significantly higher both before surgery (Brain tumor-PREPOD) and 1 day after surgery (Brain tumor-POD1). Data are expressed as mean ± standard deviation. ∗P < 0.05 versus the healthy volunteer group.
