Reviewp53 expression in pleomorphic adenoma of salivary glands: A systematic review and meta-analysis

- We examine the association between p53 expression and pleomorphic adenoma.
- We reappointed the p53 positive group in all studies to be (≥1%) in order to standardize the positive expression.
- It was the first meta-analysis focusing on the relationships between p53 expression and pleomorphic adenoma.

ObjectiveThere are conflicting data regarding immunohistochemical expression of p53 in pleomorphic adenoma. This systematic review and meta-analysis aimed to examine whether p53 expression has a role in the pathogenesis of pleomorphic adenoma.DesignA comprehensive literature search for relevant studies published from 2000 up to end of 2014 was performed using PubMed, EMBASE and the Cochrane Library Databases. Only articles in which p53 detected by immunohistochemical staining were included. The meta-analysis was done using Comprehensive Meta-Analysis software.ResultsEighteen eligible studies were included in this meta-analysis. Heterogeneity measures showed a statistically significant Cochrane Q value (P-value < 0.001). The random effects model showed an effect size of 0.254 with a 95% CI (0.139-0.417). The overall p53 positivity is 25.4%.ConclusionMutant p53 has to be detected by more precise techniques to emphasize on its role in development of pleomorphic adenoma of salivary gland.