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[DJ-1 expression in laryngeal squamous cell carcinoma and its relationship with tumor recurrence and metastasis]
Xiao-lin Zhu1, Wei-ping Wen, Wen-bin Lei
1Otorhinolaryngology Hospital of First Affiliated Hospital of SUN Yat-sen University, Otorhinolaryngology Institute of SUN Yat-sen University, Guangzhou 510080, China.
Objective:
To detect the expression of DJ-1 in laryngeal squamous cell carcinoma (LSCC) and to study the relationship between DJ-1 expression and clinical indexes of LSCC.
Methods:
The expressions of DJ-1 protein in 71 LSCC samples and 9 cases control samples from laryngeal mucosa tissues of non-LSCC patients were detected using streptavidin peroxidase immunohistochemistry staining and the relationships between DJ-1 protein expression and clinicopathologic characteristics were analyzed.
Results:
(1) The positive expression rate of DJ-1 protein in LSCC was 85.9%(61/71), which was significantly higher than the rate (55.5%, 5/9) in control laryngeal mucosa tissues (P < 0.05). (2) DJ-1 expression was related to tumor recurrence (P < 0.05), but not to sex, age, primary cancer position, T stage, clinical stage, lymph node metastasis and tumor differentiation. Tumor recurrence rate (53.3%) in the patients with higher expression of DJ-1 protein was higher than the rate (26.8%) in the patients with lower expression of DJ-1 protein (χ(2) = 5.164, P < 0.05). (3) With Kaplan-Meier curves and Cox regression analysis, the cumulative 5-year survival rates were correlated with DJ-1 expression levels in laryngeal cancer tissues or cervical lymph node metastasis (all P < 0.05), but not to sex, age, primary cancer position, T stage, clinical stage and tumor differentiation.
Conclusions:
The expression of DJ-1 protein in LSCC is higher than that in control laryngeal mucous tissues. Overexpression of DJ-1 is associated with poor overall survival in LSCC patients.
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