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

Table 2

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

First author	Year	Ethnicity	Number			Gender (M/F)	Age (years)	Sample	Method	NOS score
			Tumor	Benign	Normal
Li [8]	2013	Asian	38	33	10	21/17	25~72	Tissue	SP	8
Segawa [28]	2008	Asian	72	0	15	—	—	Tissue	SABC	6
Sawhney [29]	2007	Asian	107	0	15	85/22	—	Tissue	SABC	7
Cao [21]	2005	Asian	76	0	12	43/33	58 (36~83)	Tissue	PV-9000	8
Tang [30]	2003	Asian	27	0	4	—	—	Tissue	ABC	6
Sudbø [22]	2003	Caucasians	29	0	30	—	—	Tissue	ABC	6
Sakurai [31]	2001	Asian	30	0	15	—	—	Tissue	SABC	6
Sakurai [31]	2001	Asian	40	0	15	—	—	Tissue	SABC	6

M: male; F: female; NOS: Newcastle-Ottawa Scale; SABC: streptavidin-biotin-peroxidase complex; ABC: activity-based costing; SP: streptavidin-peroxidase; PV-9000: Power Vision-9000.