Table 3.

The comparison of promoter methylation of this study and other reports in colorectal carcinomas

Genes	Number of methylated samples (%)	References (frequency of gene)
APC	44 (35.2)	Esteller et al. [21] (18%); Arnold et al. [10] (28%); Chen et al. [20] (17.9%); Iacopetta et al. [22] (41.1%) and Fu et al. [23] (41.7%)
AXIN2	41 (32.8)	Koinuma et al. [11] (25%)
DKK3	50 (40)	Yu et al. [12] (52%)
SFRP2	58 (46.4)	Qi et al. [13] (82.8%)
SFRP4	38 (30.4)	Qi et al. [13] (32.4%)
SFRP5	33 (26.4)	Qi et al. [13] (54.3%)
SOX7	40 (32)	No Reference
SOX17	42 (33.6)	No Reference
WIF1	52 (41.6)	Lee et al. [24] (74%)
WNT5a	28 (22.4)	Rawson et al. [25] (18.8%)