Table 2. Differences in DUSP1 methylation frequency between tumour DNA and PBL^a DNA in breast cancer patients.

PBL DNAa	Tumour tissue DNA		Total No. (%)	P-valueb
	Methylated No. (%)	Unmethylated No. (%)
Methylated No. (%)	3 (1.94)	2 (1.29)	5 (3.23)	0.000
Unmethylated No. (%)	80 (51.61)	70 (45.16)	150 (96.77)
Total No. (%)	83 (53.55)	72 (46.45)	155 (100)

^aPBL, peripheral blood leukocytes. ^bP-value was generated by McNemar Test.