Abstract
Midkine (MK) expression has been documented to be inversely correlated with the prognosis of patients with various tumors, but the mechanism of this relationship has not been well characterized. Recent studies have also correlated p53 expression with prognosis of patients with oral squamous cell carcinoma (OSCC). We evaluated the relationship between MK expression and clinicopathological features of patients with OSCC to clarify the influence of p53 status on MK expression in OSCC cells. Our results showed that patients with MK over-expression in OSCC cells had a significantly lower 5-year survival rate compared with patients with low MK expression. Immunohistochemical analyses demonstrated overexpression of MK protein in OSCC samples with mutant p53. Cell culture experiments with human lingual squamous cell carcinoma revealed that the MK gene was regulated by the wild-type p53 gene. Thus, MK expression may affect prognosis via the p53 status and mutation of the p53 gene, and MK may be an attractive target for therapeutic intervention in patients with cancer cells with mutant p53.
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