Table 1.

The relationship between the expression of COX-2 and P300 and clinicopathological factors

Factor	COX-2				P300
	+	−	RR	P	+	−	RR	P
Gender
Male	35	40	0.065	0.569	37	38	0.052	0.649
Female	3	2			3	2
Age
<60 years	21	21	0.025	0.787	22	20	0.021	0.856
≥60 years	17	21			18	20
Histology grade
Well differentiated	11	28	0.396	0.000	13	26	0.349	0.001
Moderately differentiated	16	11			16	11
Poorly differentiated	11	3			11	3
T category
T1 + T2	20	33	0.300	0.007	22	31	0.258	0.021
T3 + T4	18	10			18	9
N category
N0	28	41	0.343	0.002	30	39	0.323	0.003
N+	10	1			10	1
Clinical staging
I + II	18	32	0.297	0.007	20	30	0.258	0.021
III + IV	20	10			20	10
Anatomic subsite of tumor
S	12	4	0.275	0.013	10	6	0.125	0.269
G	36	28			30	34
Recurrence
Yes	19	4	0.447	0.000	18	5	0.359	0.001
No	19	38			22	35
P300
+	33	7	0.701	0.000
−	5	35

Bold values indicate statistical significance (P < 0.05)

S superglottic, G glottic