[Retracted] Abnormal COX2 Protein Expression May Be Correlated with Poor Prognosis in Oral Cancer: A Meta-Analysis

Table 1

Main characteristics and methodological quality of all eligible studies on oral cancer prognosis.

First author	Year	Ethnicity	Number		Gender (M/F)	Age (years)	Method	Protein	NOS score
			Positive	Negative
Haffner [23]	2012	Caucasians	27	64	74/22	64 (26~85)	Envision	COX2	8
Cha [19]	2011	Asians	39	64	77/26	—	Envision	COX2	6
Sakurai [11]	2007	Asians	61	19	—	—	SABC	COX2	6
Atula [18]	2006	Caucasians	20	45	44/21	58 (31~80)	ABC	COX2	7
Itoh [27]	2003	Asians	10	62	—	62.9 ± 13.0	Envision	COX2	6

M: male; F: female; NOS: Newcastle-Ottawa Scale; SABC: streptavidin-biotin-peroxidase complex; ABC: activity-based costing.