Table 1. RBBP6 and TP53 immunohistochemical staining for protein expression in normal colonic mucosa, cancerous tissue, and lymph node metastasis.

Tissue sample	n	Expression of RBBP6			P value	Expression of TP53		P value
		Negative(%)	Weak(%)	Strong(%)		Negative(%)	Positive(%)
Normal mucosa	203	185(91.1)	18(8.9)	0(0)	<0.001*	201(99.0)	2(1.0)	<0.001*
Tumor	203	61(30.0)	86(42.4)	56(27.6)		97(47.8)	106(52.2)
LNM	66	8(12.1)	11(16.7)	47(71.2)		10(15.2)	56(84.8)

^* P-value is based on chi-square test; LNM: Lymph node metastasis.