BioMed Research International has retracted the article titled “Abnormal COX2 Protein Expression may be Correlated with Poor Prognosis in Oral Cancer: A Meta-Analysis” [1] due to the inclusion in the meta-analysis of an article cited as reference 22 that was retracted in 2007 for containing fabricated data [2].
In addition, this meta-analysis includes phrases characteristic of a series of very similar meta-analyses written by different authors that were published in 2014 and 2015 [3]. Egger’s test was conducted with fewer than 10 studies, limiting its validity.
The authors and their institution did not respond.