Table 4.

Correlation of ERα, ERβ, PR, ERα36, EGFR and HER2 protein expression with one another in 218 PTCs.

Proteins	ERα				ERβ				PR				ERα36				EGFR
	Low	High	r s	P value	Low	High	r s	P value	Low	High	r s	P value	Low	High	rs	P value	Low	High	r s	P value
ERβ
Low	81	104	−0.294	<0.001
High	28	5
PR
Low	84	18	0.607	<0.001	77	25	−0.245	<0.001
High	25	91			108	8
ERα36
Low	57	49	0.073	0.280	86	20	−0.101	0.136	55	51	0.099	0.144
High	52	60			99	13			47	65
EGFR
Low	48	38	0.094	0.167	69	17	−0.104	0.125	44	42	0.071	0.298	57	29	0.285	<0.001
High	61	71			116	16			58	74			49	83
HER2
Low	47	36	0.104	0.126	67	16	−0.091	0.183	42	41	0.060	0.379	59	24	0.352	<0.001	41	42	0.160	0.018
High	62	73			118	17			60	75			47	88			45	90

P-values for Spearman rank test; ERα, ERβ, PR, ERα36, EGFR and HER2 were tested pairwise. P < 0.05 was considered to be statistically significant.