Table 4.

Best reference gene combinations according to each software

Neoplastic tissues	Adjacentnon-neoplastic tissues	Normal tissues	Matched pairs of adjacent nonneoplastic and neoplastic gastric tissues	All gastric tissues	Cell lines	All gastric tissues+cell lines
ACTB + B2M	GAPDH + B2M	GAPDH + ACTB	ACTB + B2M	ACTB + B2M	ACTB + B2M	ACTB + 18S rRNA
GAPDH + B2M	GAPDH + B2M	GAPDH + ACTB	GAPDH + B2M	GAPDH + B2M	ACTB + B2M	ACTB + B2M
GAPDH + B2M	GAPDH + B2M	GAPDH + B2M	GAPDH + B2M	GAPDH + B2M	ACTB + B2M	ACTB + B2M
ACTB + B2M	GAPDH + B2M	GAPDH + B2M	GAPDH + B2M	GAPDH + B2M	ACTB + B2M	ACTB + B2M