Tumor necrosis factor-α gene polymorphisms and risk of oral cancer: evidence from a meta-analysis.

Numerous studies have been conducted regarding association between TNF-α and oral cancer risk, but the results remain controversial. The present meta-analysis is performed to acquire a more precise estimation of relationships. Databases of Pubmed, the Cochrane library and the China National Knowledge Internet (CNKI) were retrieved until August 10, 2013.