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Table 2 Correlation of hypermethylation in 4 genes.

From: Methylated APC and GSTP1 genes in serum DNA correlate with the presence of circulating blood tumor cells and are associated with a more aggressive and advanced breast cancer disease

   APC RASSF1 GSTP1
   neg pos neg pos neg pos
ESR1 neg 42 11 44 9 41 7
  pos 18 14 19 13 20 7
   χ2 = 0.024* χ2 = 0.016* χ2 = 0.226
APC neg    51 9 44 8
  pos    12 13 17 6
     χ2 = 0.000* χ2 = 0,024*
RASSF1 neg      49 7
  pos      12 7
       χ2 = 0.019*
  1. * p < 0.05