Table 2.

Statistical Analysis

Clinicopathologic features	Mann-Whitney U-test (P value)		Pearson's χ2 test (P value)
	RT-PCR/IHC	ELISA	RT-PCR/IHC	ELISA
Tumor stage
I + II	0.349	0.008⁎	0.020⁎	0.020⁎
II + III	0.981	0.281	0.009⁎	0.013⁎
III + IV	0.358	0.051	0.740	0.740
I + II & III + IV	0.332	0.572	0.044⁎	0.011⁎
Histological grade
WD, MD + mucinous	—	—	0.239	0.393
WD + MD	0.617	0.011⁎	0.757	0.900
WD + mucinous	0.912	0.091	0.146	0.213
MD + mucinous	0.340	0.135	0.099	0.213
Lymph node positivity	0.493	0.338	0.069	0.047⁎
Metastasis positivity	0.691	0.018⁎	0.690	0.977

ELISA, enzyme-linked immunosorbent assay; IHC, immunohistochemistry; MD, moderately differentiated; WD, well differentiated.

^⁎P < 0.05 (statistically significant).