Table 1.

Genes for which promoter methylation in serum or plasma has been shown to decrease following surgery

Cancer type	Gene	Plasma or serum	Reference
Breast	RARB2	Plasma	Liggett et al. (2011)
	MSH2
	ESR1B
Gastric	RUNX3	Serum	Sakakura et al. (2009)
Liver	CDKN2A	Plasma	Wong et al. (2003)
Esophageal	APC	Serum	Hoffmann et al. (2009)