Table 2.

Ranking of the twelve reference genes analysed using NormFinder software, according to their expression stability across the MCF7, HCT116 and HepG2 cells

Ranking order	Reference gene	M value
1	TBP	0.014
2	YWHAZ	0.023
3	RPLP	0.027
4	UBC	0.031
5	PPIA	0.032
6	GAPDH	0.035
7	ACTB	0.038
8	HPRT1	0.041
9	TUBB	0.048
10	B2M	0.048
11	GUSB	0.051
12	RRN18S	0.079