Table 1. Samples after pair selection.

Primary data set				Secondary data set
	Tissue				Tissue
	Normal mucosa	Carcinoma	Total		Normal mucosa	Carcinoma	Total
Colon
Male	220	304	524	Male	47	62	109
Female	193	276	469	Female	43	48	91
Total	413	580	993	Total	90	110	200
Rectal
Male	126	191	317	Male	48	68	116
Female	93	150	243	Female	42	42	84
Total	219	341	560	Total	90	110	200