Table 4. P-values (Wilcoxon's rank-sum test) of methylation at each of the seven CpG sites tested in sFRP1 in adenoma vs matched normal mucosa in both FAP and sporadic patients.

CpG site	FAP (n=14)	Sporadic (n=19)
1	0.217	0.007
2	0.367	0.006
3	0.075	0.007
4	0.096	0.016
5	0.451	0.005
6	0.975	0.016
7	0.221	0.015
Average of site 3 and 4	0.030	0.010
Average of site 1 to 7	0.119	0.003

Abbreviation: FAP=familial adenomatous polyposis.