Table 3.

The protein levels of HIF-2α and VEGF in CSCC and normal cervical tissues.

Group	Case number	Immunohistochemical results				Negative (−)	Positive (+)	Positive rate (%)
		−	+	++	+++
HIF-2α
CSCC	64	4	22	14	24	4	60	93.8a
Normal cervical	22	18	4	0	0	18	4	18.2
VEGF
CSCC	64	6	12	16	30	6	58	90.6b
Normal cervical	22	18	4	0	0	18	4	18.2

^aCompared with normal cervical tissues group, χ ² = 49.111, p < 0.01. ^bCompared with normal cervical tissues group, χ ² = 42.706, p < 0.01.