Background: This study analyzed the expression of CD44 and cystine-glutamate transporter SLC7A11 (xCT) in primary oral cavity squamous cell carcinoma (SCC) and the relationships of expression to tumor recurrence and patient survival.
Methods: Associations between CD44 and xCT expression and clinicopathologic results were analyzed in 231 patients with oral cavity SCC. Cox proportional hazard analyses were used to identify factors associated with recurrence-free survival (RFS), disease-specific survival (DSS), and overall survival (OS).
Results: Overexpression of CD44 and/or xCT was associated with advanced T classification, perineural invasion, and lymphovascular invasion (P < .05 each). High expression of xCT was also associated with nodal metastasis and depth of invasion (P < .01 each). Multivariate analysis indicated that high expression of xCT and both xCT and CD44 were independent predictors of poor RFS, DSS, and OS (P < .05 each).
Conclusion: Overexpression of xCT or xCT plus CD44 may predict posttreatment recurrence and survival in patients with oral cavity SCC.
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